Prostate cancer

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Prostate cancer
Other namesCarcinoma of the prostate
Diagram showing the position of the prostate and rectum CRUK 358.svg
Position of the prostate
SpecialtyOncology, urology
SymptomsNone, difficulty urinating, blood in the urine, pain in the pelvis, back, or when urinating[1][2]
Usual onsetAge > 50[3]
Risk factorsOlder age, family history, race[3]
Diagnostic methodTissue biopsy, medical imaging[2]
Differential diagnosisBenign prostatic hyperplasia[1]
TreatmentActive surveillance, surgery, radiation therapy, hormone therapy, chemotherapy[2]
Prognosis5-year survival rate 99% (US)[4]
Frequency1.2 million new cases (2018)[5]
Deaths359,000 (2018)[5]

Prostate cancer is the development of cancer in the prostate, a gland in the male reproductive system.[6] Most prostate cancers are slow growing; however, some grow relatively quickly.[1][3] The cancer cells may spread from the prostate to other areas of the body, particularly the bones and lymph nodes.[7] It may initially cause no symptoms.[1] In later stages, it can lead to difficulty urinating, blood in the urine or pain in the pelvis, back, or when urinating.[2] A disease known as benign prostatic hyperplasia may produce similar symptoms.[1] Other late symptoms may include feeling tired due to low levels of red blood cells.[1]

Factors that increase the risk of prostate cancer include older age, a family history of the disease, and race.[3] About 99% of cases occur in males over the age of 50.[3] Having a first-degree relative with the disease increases the risk two to threefold.[3] Other factors that may be involved include a diet high in processed meat, red meat or milk products or low in certain vegetables.[3] An association with gonorrhea has been found, but a reason for this relationship has not been identified.[8] An increased risk is associated with the BRCA mutations.[9] Prostate cancer is diagnosed by biopsy.[2] Medical imaging may then be done to determine if the cancer has spread to other parts of the body.[2]

Prostate cancer screening is controversial.[3][10] Prostate-specific antigen (PSA) testing increases cancer detection, but it is controversial regarding whether it improves outcomes.[10][11][12] Informed decision making is recommended when it comes to screening among those 55 to 69 years old.[13][14] Testing, if carried out, is more reasonable in those with a longer life expectancy.[15] While 5α-reductase inhibitors appear to decrease low-grade cancer risk, they do not affect high-grade cancer risk and thus are not recommended for prevention.[3] Supplementation with vitamins or minerals does not appear to affect the risk.[3][16]

Many cases are managed with active surveillance or watchful waiting.[2] Other treatments may include a combination of surgery, radiation therapy, hormone therapy or chemotherapy.[2] When it only occurs inside the prostate, it may be curable.[1] In those in whom the disease has spread to the bones, pain medications, bisphosphonates and targeted therapy, among others, may be useful.[2] Outcomes depend on a person's age and other health problems as well as how aggressive and extensive the cancer is.[2] Most men with prostate cancer do not end up dying from the disease.[2] The 5-year survival rate in the United States is 98%.[4] Globally, it is the second most common type of cancer and the fifth leading cause of cancer-related death in men.[17] In 2018, it occurred in 1.2 million men and caused 359,000 deaths.[5] It was the most common cancer in males in 84 countries,[3] occurring more commonly in the developed world.[18] Rates have been increasing in the developing world.[18] Detection increased significantly in the 1980s and 1990s in many areas due to increased PSA testing.[3] Studies of males who died from unrelated causes have found prostate cancer in 30% to 70% of those over age 60.[1]

Signs and symptoms

A diagram of prostate cancer pressing on the urethra, which can cause symptoms
Prostate cancer

Early prostate cancer usually has no clear symptoms. When they do appear, they are often similar to those of benign prostatic hyperplasia. These include frequent urination, nocturia (increased urination at night), difficulty starting and maintaining a steady stream of urine, hematuria (blood in the urine) and dysuria (painful urination). One study found that about a third of diagnosed patients had one or more such symptoms.[19]

Prostate cancer is associated with urinary dysfunction as the prostate gland surrounds the prostatic urethra. Changes within the gland directly affect urinary function. Because the vas deferens deposits seminal fluid into the prostatic urethra, and secretions from the prostate are included in semen content, prostate cancer may also cause problems with sexual function and performance, such as difficulty achieving erection or painful ejaculation.[19]

Metastatic prostate cancer can cause additional symptoms. The most common symptom is bone pain, often in the vertebrae (bones of the spine), pelvis, or ribs. Spread of cancer into other bones such as the femur is usually to the part of the bone nearer to the prostate. Prostate cancer in the spine can compress the spinal cord, causing tingling, leg weakness, and urinary and fecal incontinence.[20]

Risk factors

The primary risk factors are obesity,[21] age, and family history. Obese men have been found to have a 34% greater death rate from prostate cancer than those with normal weight.[21] Prostate cancer is uncommon in men younger than 45, but becomes more common with advancing age. The average age at the time of diagnosis is 70.[22] Autopsy studies of Chinese, German, Israeli, Jamaican, Swedish, and Ugandan men who died of other causes found prostate cancer in 30% of men in their 50s, and in 80% of men in their 70s.[23][24][25]

Men with high blood pressure are more likely to develop prostate cancer.[26] A small increase in risk is associated with lack of exercise.[27] Elevated blood testosterone levels[28] may increase risk.

Genetics

Genetics may affect risk, as suggested by associations with race, family, and specific gene variants.[29] Men who have a first-degree relative (father or brother) with prostate cancer have twice the risk of developing prostate cancer, and those with two first-degree relatives affected have a five-fold greater risk compared with men with no family history.[30][31] This risk appears to be greater for men with an affected brother than for those with an affected father. In the United States, prostate cancer more commonly affects black men than white or Hispanic men, and is also more deadly in black men.[32][33] In contrast, the incidence and mortality rates for Hispanic men are one-third lower than for non-Hispanic whites. Twin studies in Scandinavia suggest that 40% of prostate cancer risk can be explained by inherited factors.[34]

Many genes are involved in prostate cancer. Mutations in BRCA1 and BRCA2 (important risk factors for ovarian cancer and breast cancer in women) have been implicated.[35] Other linked genes include hereditary prostate cancer gene 1 (HPC1), the androgen receptor, and the vitamin D receptor.[32] TMPRSS2-ETS gene family fusion, specifically TMPRSS2-ERG or TMPRSS2-ETV1/4 promotes cancer cell growth.[36] These fusions can arise via complex rearrangement chains called chromoplexy.[37]

Two large genome-wide association studies linked single-nucleotide polymorphisms (SNPs) to prostate cancer in 2008.[38][39] These studies identified several relevant SNPs. For example, individuals with TT allele pair at SNP rs10993994 were reported to be at 1.6 times higher risk than those with the CC allele pair. This SNP explains part of the increased risk faced by African-Americans. The C allele is much more prevalent in the latter; this SNP is located in the promoter region of the MSMB gene, thus affects the amount of MSMB protein synthesized and secreted by epithelial cells of the prostate.[40]

Dietary

Consuming fruits and vegetables has been found to be of little preventive benefit.[41] Evidence supports little role for dietary fruits and vegetables.[42] Red meat and processed meat appear to have little effect.[43] Some studies reported that higher meat consumption was associated with higher risk.[44]

Lower blood levels of vitamin D may increase risks.[45]

One study found no effect of folic acid supplements on risk.[46]

Medication exposure

Some links have been established between prostate cancer and medications, medical procedures, and medical conditions.[47] Statins may also decrease risk.[48]

Infection

Prostatitis (infection or inflammation) may increase risk. In particular, infection with the sexually transmitted infections Chlamydia, gonorrhea, or syphilis seems to increase risk.[8][49]

Papilloma virus has been proposed in several studies to have a potential role, but as of 2015, the evidence was inconclusive.[50] A 2018 review suggested possible increased risk, but was still debatable.[51]

Environment

US war veterans who had been exposed to Agent Orange had a 48% increased risk of prostate cancer recurrence following surgery.[52]

Sex

Although some evidence from prospective cohort studies indicates that frequent ejaculation may reduce prostate cancer risk,[53] no randomized controlled trials reported this benefit.[54] An association between vasectomy and prostate cancer was found, but causality has not been established.[55]

Pathophysiology

Prostatelead.jpg

The prostate is part of the male reproductive system that helps make and store seminal fluid. In adult men, a typical prostate is about 3 cm long and weighs about 20 g.[56] It is located in the pelvis, under the urinary bladder and in front of the rectum. The prostate surrounds part of the urethra, the tube that carries urine from the bladder during urination and semen during ejaculation.[57] The prostate contains many small glands, which make about 20% of the fluid constituting semen.[58]

Superiorly, the prostate base is contiguous with the bladder outlet. Inferiorly, the prostate's apex heads in the direction of the urogenital diaphragm, which is pointed anterio-inferiorly. The prostate can be divided into four anatomic spaces: peripheral, central, transitional, and anterior fibromuscular stroma.[59] The peripheral space contains the posterior and lateral portions of the prostate, as well as the inferior portions of the prostate. The central space contains the superior portion of the prostate including the most proximal aspects of the urethra and bladder neck. The transitional space is located just anterior to the central space and includes urethra distal to the central gland urethra. The neurovascular bundles course along the posterolateral prostate surface and penetrate the prostatic capsule there as well.

Most of the glandular tissue is found in the peripheral and central zones (peripheral zone: 70-80% of glandular tissue; central zone: 20% of glandular tissue).[60] Some is found in the transitional space (5% of glandular tissue). Thus, most cancers that develop from glandular tissue are found in the peripheral and central spaces,[61] while about 5% is found in the transitional space. None is found in the anterior fibromuscular stroma since no glands are in that anatomic space.

The prostate glands require male hormones, known as androgens, to work properly. Androgens include testosterone, which is made in the testes; dehydroepiandrosterone, made in the adrenal glands; and dihydrotestosterone, which is converted from testosterone within the prostate itself. Androgens are also responsible for secondary sex characteristics such as facial hair and increased muscle mass.

Because of the prostate's location, prostate diseases often affect urination, ejaculation, and rarely defecation. In prostate cancer, the cells of these glands mutate into cancer cells.

Prostate cancer that has metastasized to the lymph nodes
Prostate cancer that has metastasized to the bone

Most prostate cancers are classified as adenocarcinomas, or glandular cancers, that begin when semen-secreting gland cells mutate into cancer cells. The region of the prostate gland where the adenocarcinoma is most common is the peripheral zone. Initially, small clumps of cancer cells remain within otherwise normal prostate glands, a condition known as carcinoma in situ or prostatic intraepithelial neoplasia (PIN). Although no proof establishes that PIN is a cancer precursor, it is closely associated with cancer. Over time, these cells multiply and spread to the surrounding prostate tissue (the stroma) forming a tumor.

Eventually, the tumor may grow large enough to invade nearby organs such as the seminal vesicles or the rectum, or tumor cells may develop the ability to travel in the bloodstream and lymphatic system.

Prostate cancer is considered a malignant tumor because it can invade other areas of the body. This invasion is called metastasis. Prostate cancer most commonly metastasizes to the bones and lymph nodes, and may invade the rectum, bladder, and lower ureters after local progression. The route of metastasis to bone is thought to be venous, as the prostatic venous plexus draining the prostate connects with the vertebral veins.[62]

The prostate is a zinc-accumulating, citrate-producing organ. Transport protein ZIP1 is responsible for the transport of zinc into prostate cells. One of zinc's important roles is to change the cell's metabolism to produce citrate, an important semen component. The process of zinc accumulation, alteration of metabolism, and citrate production is energy inefficient, and prostate cells require enormous amounts of energy (ATP) to accomplish this task. Prostate cancer cells are generally devoid of zinc. Prostate cancer cells save energy by not making citrate, and use the conserved energy to grow, reproduce and spread.

The absence of zinc is thought to occur via silencing the gene that produces ZIP1. It is called a tumor suppressor gene product for the gene SLC39A1. The cause of the epigenetic silencing is unknown. Strategies that transport zinc into transformed prostate cells effectively eliminate these cells in animals. Zinc inhibits NF-κB pathways, is antiproliferative, and induces apoptosis in abnormal cells. Unfortunately, oral ingestion of zinc is ineffective since high concentrations of zinc into prostate cells is not possible without ZIP1.[63]

Loss of cancer suppressor genes, early in prostatic carcinogenesis, have been localized to chromosomes 8p, 10q, 13q, and 16q. P53 mutations in the primary prostate cancer are relatively low and are more frequently seen in metastatic settings, hence, p53 mutations are a late event in the pathology. Other tumor suppressor genes that are thought to play a role include PTEN and KAI1. "Up to 70 percent of men with prostate cancer have lost one copy of the PTEN gene at the time of diagnosis".[64] Relative frequency of loss of E-cadherin and CD44 has also been observed. Loss of the retinoblastoma (RB) protein induces androgen receptor deregulation in castration-resistant prostate cancer by deregulating 'E2F1 expression.[65]

RUNX2 is a transcription factor that prevents cancer cells from undergoing apoptosis, thereby contributing to cancer development.[66]

The PI3k/Akt signaling cascade works with the transforming growth factor beta/SMAD signaling cascade to ensure cancer cell survival and protect against apoptosis.[67] Pim-1 is upregulated in prostate cancer.[68] X-linked inhibitor of apoptosis (XIAP) is hypothesized to promote cancer cell survival and growth.[69] Macrophage inhibitory cytokine-1 (MIC-1) stimulates the focal adhesion kinase (FAK) signaling pathway which leads to cancer cell growth and survival.[70]

The androgen receptor helps cancer cells to survive.[71] Prostate-specific membrane antigen (PSMA) stimulates cancer development by increasing folate levels, helping the cancer cells to survive and grow; it increases available folates for use by hydrolyzing glutamated folates.[72]

Diagnosis

If already having grown large, a prostate cancer may first be detected on CT scan.

The American Cancer Society's position regarding early detection by PSA testing is:

Research has not yet proven that the potential benefits of testing outweigh the harms of testing and treatment. The American Cancer Society believes that men should not be tested without learning about what we know and don’t know about the risks and possible benefits of testing and treatment. Starting at age 50, (45 if African American or brother or father suffered from condition before age 65) talk to your doctor about the pros and cons of testing so you can decide if testing is the right choice for you."[73]

Several other tests can be used to gather information about the prostate and the urinary tract. Digital rectal examination may allow a doctor to detect prostate abnormalities. Cystoscopy shows the urinary tract from inside the bladder, using a thin, flexible camera tube inserted in the urethra. Transrectal ultrasonography creates a picture of the prostate using sound waves from a probe in the rectum, but the only test that can fully confirm the diagnosis of prostate cancer is a biopsy, the removal of small pieces of the prostate for microscopic examination.

Imaging

Ultrasound and magnetic resonance imaging (MRI) are the two main imaging methods used for prostate cancer detection.

MRI

On MRI, the central and transitional zones both have lower T2 signal than the peripheral zone. Since the central and transitional zones cannot be distinguished from each other, they can be best described as the central gland on MRI. Thus, the peripheral gland has a higher signal on T2WI than the central gland. In the peripheral gland, prostate cancer appears as a low-intensity lesion. However, in the central gland, low-intensity lesions cannot be distinguished from the low-intensity central gland. Diffusion restriction is instrumental in identifying and characterizing central gland lesions. Lymphadenopathy can be seen best on postcontrast, fat-suppressed T1WI.

Other regions can be described on MRI. The anterior fibromuscular stroma and the prostate capsule along the posterior and lateral prostate have a low T2WI signal, in contrast with the bright signal of the peripheral zone. Extraprostatic extension can be seen with disruption of capsule integrity.

As of 2011, MRI was used to identify targets for prostate biopsy using fusion MRI with ultrasound (US) or MRI-guidance alone. One study reported that given a clinical suspicion, MRI-guided fusion biopsy detected clinically significant cancer in 38% compared to 26% in the standard biopsy group.[74] In candidates for active surveillance, fusion MR/US-guided prostate biopsy detected 33% of cancers compared to 7% with standard ultrasound-guided biopsy.[75]

The prostate imaging-reporting and data system defines standards of clinical service for multiparametric MRI (mpMRI), including image creation and reporting. PI-RADS version 2 scoring has shown a specificity and sensitivity of 73% and 95%, respectively, for detection of prostate cancer.[76]

Prostate MRI is also used for surgical planning for robotic prostatectomy. It helps surgeons decide whether to resect or spare the neurovascular bundle, determine return to urinary continence, and help assess surgical difficulty.[77] MRI can also be used to target areas for research sampling in biobanking.[78][79]

Ultrasound

Ultrasound imaging can be obtained transrectally and is used during prostate biopsies. Prostate cancer can be seen as a hypoechoic lesion in 60% of cases. The other 40% of cancerous lesions are either hyperechoic or isoechoic. On Color Doppler, the lesions appear hypervascular.

Biopsy

Prostate needle biopsy

If cancer is suspected, a biopsy is offered expediently. During a biopsy, a urologist or radiologist obtains tissue samples from the prostate via the rectum. A biopsy gun inserts and removes special hollow-core needles (usually three to six on each side of the prostate) in less than a second. Prostate biopsies are routinely done on an outpatient basis and rarely require hospitalization.

Antibiotics should be used to prevent complications such as fever, urinary tract infections, and sepsis[80] even if the most appropriate course or dose is undefined.[81] About 55% of men report discomfort during prostate biopsy.[82]

Histopathologic diagnosis

Micrograph showing a prostate cancer (conventional adenocarcinoma) with perineural invasion. H&E stain.

A histopathologic diagnosis mainly includes assessment of whether a cancer exists, as well as any subdiagnosis, if possible. Histopathologic subdiagnosis has implications for the possibility and methodology of Gleason scoring.[84] The most common histopathological subdiagnosis is acinar adenocarcinoma, constituting 93% of diagnoses.[85] The most common form of acinar adenocarcinoma, in turn, is "adenocarcinoma, not otherwise specified", also termed conventional, or usual acinar adenocarcinoma.[86]

Biochemical diagnosis

Alkaline phosphatase is more elevated in metastatic than non-metastatic cells.[87] High levels of alkaline phosphatase is associated with a significant decrease in survival.[87]

Gleason score

The Gleason grading system is used to help evaluate the prognosis and helps guide therapy. A Gleason score is based upon the tumor's appearance.[88] Cancers with a higher Gleason score are more aggressive and have a worse prognosis. Pathological scores range from 2 through 10, with a higher number indicating greater risks and higher mortality.

Tumor markers

Tissue samples can be stained for the presence of PSA and other tumor markers to determine the origin of malignant cells that have metastasized.[89]

Small cell carcinoma is a rare (1%[90]) type that cannot be diagnosed using PSA.[90][91] As of 2009 researchers were investigating ways to screen for this type, because it is quick to metastasize.[91]

The oncoprotein BCL-2 is associated with the development of androgen-independent prostate cancer, due to its high levels of expression in androgen-independent tumours in advanced stages. The upregulation of BCL-2 after androgen ablation in prostate carcinoma cell lines and in a castrated-male rat model further established a connection between BCL-2 expression and prostate cancer progression.[92]

Staging

Diagram showing T1-3 stages of prostate cancer.

An important part of evaluating prostate cancer is determining the stage, or degree of spread. Knowing the stage helps define prognosis and is useful when selecting therapies. The most common system is the four-stage TNM system (abbreviated from tumor/nodes/metastases). Its components include the size of the tumor, the number of involved lymph nodes, and the presence of any other metastases.[93]

The most important distinction made by any staging system is whether the cancer is confined to the prostate. In the TNM system, clinical T1 and T2 cancers are found only in the prostate, while T3 and T4 cancers have metastasized. Several tests can be used to look for evidence of spread. Medical specialty professional organizations recommend against the use of PET scans, CT scans, or bone scans when a physician stages early prostate cancer with low risk for metastasis.[94] Those tests would be appropriate in cases such as when a CT scan evaluates spread within the pelvis, a bone scan looks for spread to the bones, and endorectal coil magnetic resonance imaging evaluates the prostatic capsule and the seminal vesicles. Bone scans should reveal osteoblastic appearance due to increased bone density in the areas of bone metastasis—the reverse of what is found in many other metastatic cancers.

After a biopsy, a pathologist examines the samples under a microscope. If cancer is present, the pathologist reports the grade of the tumor. The grade tells how much the tumor tissue differs from normal prostate tissue and suggests how fast the tumor is likely to grow. The pathologist assigns a Gleason number from 1 to 5 for the most common pattern observed under the microscope, then does the same for the second-most common pattern. The sum of these two numbers is the Gleason score. The Whitmore-Jewett stage is another method.

In men with high-risk localised prostate cancer, staging with PSMA PET/CT may be appropriate to detect nodal or distant metastatic spread. In 2020, a randomised phase 3 trial compared Gallium-68 PSMA PET/CT to standard imaging (CT and bone scan). It reported superior accuracy of Gallium-68 PSMA-11 PET/CT (92% vs 65%), higher significant change in management (28% vs 15%), less equivocal/uncertain imaging findings (7% vs 23%) and lower radiation exposure (10 msV vs 19 mSv). The study concluded that PSMA PET/CT is a suitable replacement for conventional imaging.[95]

Prevention

Diet and lifestyle

The data on the relationship between diet and prostate cancer are poor.[96] However, the rate of prostate cancer is linked to the consumption of the Western diet.[96] Little if any evidence associates trans fat, saturated fat, and carbohydrate intake and prostate cancer.[96][97] Evidence does not offer a role for omega-3 fatty acids in preventing prostate cancer.[96][98] Vitamin supplements appear to have no effect and some may increase the risk.[16][96] High calcium intake has been linked to advanced prostate cancer.[99]

Fish may lower prostate-cancer deaths, but does not appear to affect occurrence.[100] Some evidence supports lower rates of prostate cancer with a vegetarian diet/,[101] lycopene, selenium[102][103] cruciferous vegetables, soy, beans and/or other legumes.[104]

Regular exercise may slightly lower risk, especially vigorous activity.[104]

Medications

In those who are regularly screened, 5-alpha-reductase inhibitors (finasteride and dutasteride) reduce the overall risk of prostate cancer. Data are insufficient to determine if they affect fatality risk and they may increase the chance of more serious cases.[105]

Screening

Prostate cancer screening searches for cancers in those without symptoms. Options include the digital rectal exam and the PSA blood test.[106] Such screening is controversial,[107] and for many, may lead to unnecessary disruption and possibly harmful consequences.[108] Harms of population-based screening, primarily due to overdiagnosis (the detection of latent cancers that would have otherwise not been discovered) may outweigh the benefits.[106] Others recommend shared decision-making, an approach where screening may occur after a physician consultation.[109]

The United States Preventive Services Task Force (USPSTF) suggests the decision whether to have PSA screening be based on consultation with a physician for men 55 to 69 years of age.[11] USPSTF recommends against PSA screening after age 70.[13] The Centers for Disease Control and Prevention endorsed USPSTF's conclusion.[110] The American Society of Clinical Oncology and the American College of Physicians discourage screening for those who are expected to live less than 10–15 years, while those with a greater life expectancy a decision should individually balance the potential risks and benefits.[111] In general, they concluded, "it is uncertain whether the benefits associated with PSA testing for prostate cancer screening are worth the harms associated with screening and subsequent unnecessary treatment."[112]

American Urological Association (AUA 2013) guidelines call for weighing the uncertain benefits of screening against the known harms associated with diagnostic tests and treatment. The AUA recommends that shared decision-making should control screening for those 55 to 69, and that screening should occur no more often than every two years.[113] In the United Kingdom as of 2015, no program existed to screen for prostate cancer.[12]

Management

The first decision is whether treatment is needed. Low-grade forms found in elderly men often grows so slowly that treatment is required.[114] Treatment may also be inappropriate if a person has other serious health problems or is not expected to live long enough for symptoms to appear. Approaches in which treatment is postponed are termed "expectant management".[114] Expectant management is divided into two approaches: Watchful waiting, which has palliative intent (aims to treat symptoms only), and active surveillance, which has curative intent (aims to prevent the cancer from advancing).[114]

Which option is best depends on disease stage, the Gleason score, and the PSA level. Other important factors are age, general health and a person's views about potential treatments and their possible side effects. Because most treatments can have significant side effects, such as erectile dysfunction and urinary incontinence, treatment discussions often focus on balancing the goals of therapy with the risks of lifestyle alterations. A 2017 review found that more research focused on person-centered outcomes is needed to guide patients.[115] A combination of treatment options is often recommended.[116][117][118]

Although the widespread use of PSA screening in the US has resulted in diagnosis at earlier age and cancer stage, almost all cases are still diagnosed after age 65, while about 25% are diagnosed after age 75.[119] Though US National Comprehensive Cancer Network guidelines recommend using life expectancy to help make treatment decisions, in practice, many elderly patients are not offered curative treatment options such as radical prostatectomy or radiation therapy and are instead treated with hormonal therapy or watchful waiting.[120]

Guidelines for specific clinical situations require estimation of life expectancy.[121] As average life expectancy increases due to advances in the treatment of other diseases, more patients will live long enough for their prostate cancer to express symptoms. Therefore, interest grew in aggressive treatment modalities such as surgery or radiation even for localized disease.

Alternatively, an 18-item questionnaire was proposed to learn whether patients have adequate knowledge and understanding of their treatment options. In one 2015 study, most of those who were newly diagnosed correctly answered fewer than half of the questions.[121]

Surveillance

Many men diagnosed with low-risk prostate cancer are eligible for active surveillance. The tumor is carefully observed over time, with the intention of initiating treatment if signs of progression appear. Active surveillance is not synonymous with watchful waiting, a term which implies no treatment or specific program of monitoring, with the assumption that only palliative treatment would be used if advanced, symptomatic disease develops.[114]

Active surveillance involves monitoring the tumor for growth or symptoms, which trigger treatment. The monitoring process may involve PSA tests, digital rectal examination, and/or repeated biopsies every few months.[122] The goal of active surveillance is to postpone treatment, and avoid overtreatment and its side effects, given a slow-growing or self-limited tumor that in most people is unlikely to cause problems. This approach is not used for aggressive cancers, and may cause anxiety for people who wrongly believe that all cancers are deadly or that their condition is life-threatening. 50 to 75% of patients die from other causes without experiencing prostate symptoms.[123] In localized disease, neither radical prostatectomy nor watchful waiting has shown clearly superior results.[124]

Active treatment

Both surgical and nonsurgical treatments are available, but treatment can be difficult, and combinations can be used.[125] Treatment by external beam radiation therapy, brachytherapy, cryosurgery, high-intensity focused ultrasound, and prostatectomy are, in general, offered to men whose cancer remains within the prostate. Hormonal therapy and chemotherapy are often reserved for metastatic disease. Exceptions include local or metastasis-directed therapy with radiation may be used for advanced tumors with limited metastasis.[126] Hormonal therapy is used for some early-stage tumors. Cryotherapy (the process of freezing the tumor), hormonal therapy, and chemotherapy may be offered if initial treatment fails and the cancer progresses. Sipuleucel-T, a cancer vaccine, was reported to offer a four-month increase in survival in metastatic prostate cancer.[127]

If radiation therapy fails, radical prostatectomy may be an option, though it is a technically challenging surgery.[citation needed] However, radiation therapy after surgical failure may have many complications.[128] It is associated with a small increase in bladder and colon cancer.[129] Radiotherapy and surgery appear to result in similar outcomes with respect to bowel, erectile and urinary function after five years.[130]

Nonsurgical treatment

Non-surgical treatment may involve radiation therapy, chemotherapy, hormonal therapy, external beam radiation therapy, and particle therapy, high-intensity focused ultrasound, or some combination.[131][132] In those with localized or locally advanced prostate cancer, radiation therapy at the time of prostatectomy does not improve outcomes.[133]

Prostate cancer that persists when testosterone levels are lowered by hormonal therapy is called castrate-resistant prostate cancer (CRPC).[134][135] Many early-stage cancers need normal levels of testosterone to grow, but CRPC does not. Previously considered "hormone-refractory prostate cancer" or "androgen-independent prostate cancer", the term CRPC emerged because these cancers show reliance upon hormones, particularly testosterone, for androgen receptor activation.[136]

The cancer chemotherapeutic docetaxel has been used as treatment for CRPC with a median survival benefit of 2 to 3 months.[137][138] A second-line chemotherapy treatment is cabazitaxel.[139] A combination of bevacizumab, docetaxel, thalidomide and prednisone appears effective in the treatment of CRPC.[140]

Immunotherapy treatment with sipuleucel-T in CRPC increases survival by four months.[141] The second line hormonal therapy abiraterone increases survival by 4.6 months.[142] Enzalutamide is another second line hormonal agent with a five month survival advantage. Both abiraterone and enzalutamide are currently in clinical trials in those with CRPC who have not previously received chemotherapy.[143][144]

Not all people respond to androgen signaling-blocking drugs. Certain cells with characteristics resembling stem cells remain unaffected.[145][146] Therefore, the desire to improve CRPC outcomes resulted in increasing doses or combination therapy with synergistic androgen-signaling blocking agents.[147] But even these combination will not affect stem-like cells that do not exhibit androgen signaling.[148]

Surgery

Radical prostatectomy is considered the mainstay of surgical treatment of prostate cancer, where the surgeon removes the prostate, seminal vesicles, and surrounding lymph nodes. It can be done by an open technique (a skin incision at the lower abdomen), or laparoscopically. Radical retropubic prostatectomy is the most commonly used open surgical technique.[citation needed] Robotic-assisted prostatectomy has become common.[149] Men with localized prostate cancer, having laparoscopic radical prostatectomy or robotic-assisted radical prostatectomy, might have shorter stays in the hospital and get fewer blood transfusions than men undergoing open radical prostatectomy.[150] How these treatments compare with regards to overall survival or recurrence-free survival is unknown.[150]

Transurethral resection of the prostate is the standard surgical treatment for benign enlargement of the prostate.[149] In prostate cancer, this procedure can be used to relieve symptoms of urinary retention caused by a large prostate tumor, but it is not used to treat the cancer itself. The procedure is done under spinal anesthesia, a resectoscope is inserted inside the penis and the extra prostatic tissue is cut to clear the way for the urine to pass.

Complications

The two main complications encountered after prostatectomy and prostate radiotherapy are erectile dysfunction and urinary incontinence, mainly stress-type. Most men regain continence within 6 to 12 months after the operation, so doctors usually wait at least one year before resorting to invasive treatments.[151]

Stress urinary incontinence usually happens after prostate surgery or radiation therapy due to factors that include damage to the urethral sphincter or surrounding tissue and nerves. The prostate surrounds the urethra, a muscular tube that closes the urinary bladder. Any of the mentioned reasons can lead to incompetent closure of the urethra and hence incontinence.[152] Initial therapy includes bladder training, lifestyle changes, kegel exercises, and the use of incontinence pads. More invasive surgical treatment can include the insertion of a urethral sling or an artificial urinary sphincter, which is a mechanical device that mimics the function of the urethral sphincter, and is activated manually by the patient through a switch implanted in the scrotum. The latter is considered the gold standard in patients with moderate or severe stress urinary incontinence.[153]

Erectile dysfunction happens in different degrees in nearly all men who undergo prostate cancer treatment, including radiotherapy or surgery; however, within one year, most of them will notice improvement. If nerves were damaged, this progress may not take place. Pharmacological treatment includes PDE-5 inhibitors such as viagra or cialis, or injectable intracavernous drugs injected directly into the penis (prostaglandin E1 and vasoactive drug mixtures). Other nonpharmacological therapy includes vacuum constriction devices and penile implants.[154]

Prognosis

Many prostate cancers are not destined to be lethal, and most men will ultimately not die as a result of the disease. Mortality varies widely across geography and other elements. In the United States, five-year survival rates range from 29% (distant metastases) 100% (local or regional tumors).[155] In Japan, the fatality rate rose to 8.6/100,000 in 2000.[156] In India in the 1990s, half of those diagnosed with local cancer died within 19 years.[157] One study reported that African-Americans have 50–60 times more deaths than found in Shanghai, China.[158] In Nigeria, 2% of men develop prostate cancer, and 64% of them are dead after 2 years.[159] Most Nigerian men present with metastatic disease with a typical survival of 40 months.[160]

In patients who undergo treatment, the most important clinical prognostic indicators of disease outcome are the stage, pretherapy PSA level, and Gleason score. The higher the grade and the stage, the poorer the prognosis. Nomograms can be used to calculate the estimated risk of the individual patient. The predictions are based on the experience of large groups of patients.[161]

Androgen ablation therapy causes remission in 80–90% of patients undergoing therapy, resulting in a median progression-free survival of 12 to 33 months. After remission, an androgen-independent phenotype typically emerges, wherein the median overall survival is 23–37 months from the time of initiation of androgen ablation therapy.[162] How androgen-independence is established and how it re-establishes progression is unclear.[163]

Classification systems

Micrograph of prostate adenocarcinoma, acinar type, the most common type of prostate cancer. Needle biopsy, H&E stain

Several tools are available to help predict outcomes, such as pathologic stage and recurrence after surgery or radiation therapy. Most combine stage, grade, and PSA level, and some include the number or percentage of biopsy cores positive, age, and/or other information.

  • The D'Amico classification stratifies men by low, intermediate, or high risk based on stage, grade and PSA. It is used widely in clinical practice and research settings. The major downside to the three-level system is that it does not account for multiple adverse parameters (e.g., high Gleason score and high PSA) in stratifying patients.
  • The Partin table][164] predict pathologic outcomes (margin status, extraprostatic extension, and seminal vesicle invasion) based on the same three variables and are published as lookup tables.
  • The Kattan nomograms predict recurrence after surgery and/or radiation therapy, based on data available at the time of diagnosis or after surgery. The Kattan score represents the likelihood of remaining free of disease at a given time interval following treatment.
  • The UCSF Cancer of the Prostate Risk Assessment (CAPRA) score predicts both pathologic status and recurrence after surgery. It offers accuracy comparable to the Kattan preoperative nomogram and can be calculated without tables or a calculator. Points are assigned based on PSA, grade, stage, age, and percentage of cores positive; the sum yields a 0–10 score, with every two points representing roughly a doubling of risk of recurrence. The CAPRA score was derived from community-based data in the CaPSURE database.[165] It has been validated among over 10,000 prostatectomy patients, including patients from CaPSURE;[166] the SEARCH registry, representing data from several Veterans Health Administration and military medical centers;[167] a multi-institutional cohort in Germany;[168] and the prostatectomy cohort at Johns Hopkins University.[169] More recently, it has been shown to predict metastasis and mortality following prostatectomy, radiation therapy, watchful waiting, or androgen deprivation therapy.[170]

Life expectancy

Life expectancy projections are averages for an entire male population, and many medical and lifestyle factors modify these numbers. For example, studies have shown that a 40-year-old man will lose 3.1 years of life if he is overweight (BMI 25–29) and 5.8 years of life if he is obese (BMI 30 or more), compared to men of normal weight. If he is both overweight and a smoker, he will lose 6.7 years, and if obese and a smoker, he will lose 13.7 years.[171]

No evidence shows that either surgery or beam radiation has an advantage over the other in this regard. The lower death rates reported with surgery appear to occur because surgery is more likely to be offered to younger men with less severe cancers. Insufficient information is available to determine whether seed radiation extends life more readily than the other treatments, but data so far do not suggest that it does.[172]

Men with low-grade disease (Gleason 2–4) were unlikely to die of prostate cancer within 15 years of diagnosis. Older men (age 70–75) with low-grade disease had a roughly 20% overall survival at 15 years due to deaths from competing causes. Men with high-grade disease (Gleason 8–10) experienced high mortality within 15 years of diagnosis, regardless of their age.[173]

Epidemiology

Age-standardized death from prostate cancer per 100,000 inhabitants in 2004.[174]
  no data
  <4
  4–8
  8–12
  12–16
  16–20
  20–24
  24–28
  28–32
  32–36
  36–40
  40–44
  >44

As of 2012, prostate cancer is the second-most frequently diagnosed cancer (at 15% of all male cancers)[175] and the sixth leading cause of cancer death in males worldwide.[176] In 2010, prostate cancer resulted in 256,000 deaths, up from 156,000 deaths in 1990.[177] Rates of prostate cancer vary widely across the world. Although the rates vary widely between countries, it is least common in South and East Asia, and more common in Europe, North America, Australia, and New Zealand.[178] Prostate cancer is least common among Asian men and most common among black men, with figures for white men in between.[179][180]

The average annual incidence rate of prostate cancer between 1988 and 1992 among Chinese men in the United States was 15 times higher than that of their counterparts living in Shanghai and Tianjin,[179][180][181] but these high rates may be affected by increasing rates of detection.[182] Many suggest that prostate cancer may be under-reported, yet BPH incidence in China and Japan is similar to rates in Western countries.[183][184]

More than 80% of men will develop prostate cancer by the age of 80.[185] In the majority of cases, cancer will be slow-growing and of little concern. In such men, diagnosing prostate cancer is overdiagnosis—the needless identification of a technically aberrant condition that will never harm the patient—and treatment in such men exposes them to all of its adverse effects, with no possibility of extending their lives.[186]

United States

New cases and deaths from prostate cancer in the United States per 100,000 males between 1975 and 2014

In the United States in 2005, an estimated 230,000 new cases of prostate cancer and 30,000 deaths due to prostate cancer occurred.[187]

In 2018, an estimated 164,690 new cases and 29,430 prostate cancer–related deaths will occur in the United States. Prostate cancer is now the second-leading cause of cancer death in men, exceeded by lung cancer and colorectal cancer. It accounts for 19% of all male cancers and 9% of male cancer-related deaths. Age-adjusted incidence rates increased steadily from 1975 through 1992, with particularly dramatic increases associated with the inception of widespread use of prostate-specific antigen (PSA) screening in the late 1980s and early 1990s, followed by a fall in incidence. A decline in early-stage prostate cancer incidence rates from 2011 to 2012 (19%) in men aged 50 years and older persisted through 2013 (6%).

Between 2013 and 2015, mortality rates appear to have stabilized. Declines in mortality rates in certain jurisdictions may reflect the benefit of PSA screening, but these observations may be explained by independent phenomena such as improved treatments. The estimated lifetime risk of a prostate cancer diagnosis is about 14.0%, and the lifetime risk of dying from this disease is 2.6%. Cancer statistics from the American Cancer Society and the National Cancer Institute indicated that between 2005 and 2011, the proportion of disease diagnosed at a locoregional stage was 93% for whites and 92% for African Americans; the proportion of disease diagnosed at a late stage was 4% for whites and 5% for African Americans.

In the United States, it is more common in the African American population than the White American population.[3] An autopsy study of White and Asian men also found an increase in occult prostate cancer with age, reaching nearly 60% in men older than 80 years. More than 50% of cancers in Asian men and 25% of cancers in White men had a Gleason score of 7 or greater, suggesting that Gleason score may be an imprecise indicator of clinically insignificant prostate cancer.[188]

Canada

Prostate cancer is the third-leading type of cancer in Canadian men. In 2016, around 4,000 died and 21,600 men were diagnosed with prostate cancer.[107]

Europe

In Europe in 2012, it was the third-most diagnosed cancer after breast and colorectal cancers at 417,000 cases.[189]

In the United Kingdom, it is also the second-most common cause of cancer death after lung cancer, where around 35,000 cases are diagnosed every year, of which around 10,000 die of it.[190]

History

Although the prostate was first described by Venetian anatomist Niccolò Massa in 1536, and illustrated by Flemish anatomist Andreas Vesalius in 1538,[191] prostate cancer was not identified until 1853.[192][193] Prostate cancer was initially considered a rare disease, probably because of shorter life expectancies and poorer detection methods in the 19th century. The first treatments of prostate cancer were surgeries to relieve urinary obstruction.[194]

Removal of the gland was first described in 1851,[195] and removal for prostate cancer (radical perineal prostatectomy) was first performed in 1904 by Hugh H. Young at Johns Hopkins Hospital.[196][192]

Surgical removal of the testes (orchiectomy) to treat prostate cancer was first performed in the 1890s, but with limited success. Transurethral resection of the prostate (TURP) replaced radical prostatectomy for symptomatic relief of obstruction in the middle of the 20th century because it could better preserve penile erectile function. Radical retropubic prostatectomy was developed in 1983 by Patrick Walsh.[197] This surgical approach allowed for removal of the prostate and lymph nodes with maintenance of penile function.

In 1941, Charles B. Huggins published studies in which he used estrogen to oppose testosterone production in men with metastatic prostate cancer. This discovery of "chemical castration" won Huggins the 1966 Nobel Prize in Physiology or Medicine.[198] The role of the gonadotropin-releasing hormone (GnRH) in reproduction was determined by Andrzej W. Schally and Roger Guillemin, who both won the 1977 Nobel Prize in Physiology or Medicine for this work. GnRH receptor agonists, such as leuprorelin and goserelin, were subsequently developed and used to treat prostate cancer.[199][200]

Radiation therapy for prostate cancer was first developed in the early 20th century and initially consisted of intraprostatic radium implants. External beam radiotherapy became more popular as stronger [X-ray] radiation sources became available in the middle of the 20th century. Brachytherapy with implanted seeds (for prostate cancer) was first described in 1983.[201]

Systemic chemotherapy for prostate cancer was first studied in the 1970s. The initial regimen of cyclophosphamide and 5-fluorouracil was quickly joined by multiple regimens using a host of other systemic chemotherapy drugs.[202]

Society and culture

People with prostate cancer generally encounter significant disparities in awareness, funding, media coverage, and research—and therefore, inferior treatment and poorer outcomes—compared to other cancers of equal prevalence.[203] In 2001, The Guardian noted that Britain had 3,000 nurses specializing in breast cancer, compared to only one for prostate cancer. It also discovered that the waiting time between referral and diagnosis was two weeks for breast cancer but three months for prostate cancer.[204]

A 2007 report by the U.S.-based National Prostate Cancer Coalition stated that for every prostate cancer drug on the market, there were seven used to treat breast cancer. The Times also noted an "anti-male bias in cancer funding" with a four-to-one discrepancy in the United Kingdom by both the government and by cancer charities such as Cancer Research UK.[203][205] Equality campaigners such as author Warren Farrell cite such stark spending inequalities as a clear example of governments unfairly favouring women's health over men's health.[206]

Disparities also extend into areas such as detection, with governments failing to fund or mandate prostate cancer screening while fully supporting breast cancer programs. For example, a 2007 report found 49 U.S. states mandate insurance coverage for routine breast cancer screening, compared to 28 for prostate cancer.[207] Prostate cancer also experiences significantly less media coverage than other, equally prevalent cancers, with a study by Prostate Coalition showing 2.6 breast cancer stories for each one covering cancer of the prostate.[203]

Prostate Cancer Awareness Month takes place in September in a number of countries. A light blue ribbon is used to promote the cause.[208][209]

Research

CRPC

MDV3100 was in phase III trials for CRPC (chemo-naive and post-chemo patient populations)[210] and gained FDA approval in 2012 as enzalutamide for the treatment of castration-resistant prostate cancer.[143][144]

Alpharadin completed a phase 3 trial for CRPC patients with bone metastasis. A pre-planned interim analysis showed improved survival and quality of life. The study was stopped for ethical reasons to give the placebo group the same treatment. Alpharadin uses bone targeted Radium-223 isotopes to kill cancer cells by alpha radiation.[211][unreliable medical source?] It was approved by the U.S. Food and Drug Administration (FDA) on May 15, 2013, ahead of schedule under the priority review program.[212] Alpharadin still waits for approval by the European Medicines Agency (EMA).

As of 2016 PARP inhibitor olaparib has shown promise in clinical trials for CRPC.[213] Also in trials for CRPC are : checkpoint inhibitor ipilimumab, CYP17 inhibitor galeterone (TOK-001), and immunotherapy PROSTVAC.[213]

All medications for CRPC block AR signaling via direct or indirect targeting of the AR ligand binding domain (LBD). Over the last decade molecules that could successfully target these alternative domains have emerged.[214] Such therapies could provide an advantage; particularly in treating prostate cancers that are resistant to current therapies like enzalutamide.[214]

Pre-clinical

Arachidonate 5-lipoxygenase has been identified as playing a significant role in the survival of prostate cancer cells.[215][216][217] Medications which target this enzyme may be an effective therapy for limiting tumor growth and cancer metastasis, as well as inducing programmed cell death in cancer cells.[215][216][217] In particular, arachidonate 5-lipoxygenase inhibitors produce massive, rapid programmed cell death in prostate cancer cells.[215][216][217]

Targeting galectin-3 might be effective in slowing prostate cancer progression.[218] Aberrant glycan profiles have been described in prostate cancer,[219][220] and studies have found specific links between the galectin signature and prostate cancer.[221][222]

The PIM kinase family has also been suggested as a potential target for selective inhibition in prostate cancer. A number of drugs are under development which target this family, but it has been suggested the most promising approach may be to co-target this family with other pathways including PI3K.[68]

Cancer models

Scientists have established a few prostate cancer cell lines to investigate the mechanism involved in the progression of prostate cancer. LNCaP, PC-3 (PC3), and DU-145 (DU145) are commonly used prostate cancer cell lines. The LNCaP cancer cell line was established from a human lymph node metastatic lesion of prostatic adenocarcinoma. PC-3 and DU-145 cells were established from human prostatic adenocarcinoma metastatic to bone and to brain, respectively. LNCaP cells express androgen receptor (AR), but PC-3 and DU-145 cells express very little or no AR. AR, an androgen-activated transcription factor, belongs to the steroid nuclear receptor family. Development of the prostate is dependent on androgen signaling mediated through AR, and AR is also important during the development of prostate cancer.

The proliferation of LNCaP cells is androgen-dependent but the proliferation of PC-3 and DU-145 cells is androgen-insensitive. Elevation of AR expression is often observed in advanced prostate tumors in patients.[223][224] Some androgen-independent LNCaP sublines have been developed from the ATCC androgen-dependent LNCaP cells after androgen deprivation for study of prostate cancer progression. These androgen-independent LNCaP cells have elevated AR expression and express prostate specific antigen upon androgen treatment. The paradox is that androgens inhibit the proliferation of these androgen-independent prostate cancer cells.[225][226][227]

Infections

In 2006, a previously unknown retrovirus, Xenotropic MuLV-related virus (XMRV), was associated with human prostate tumors,[228] but subsequent reports on the virus were contradictory,[229][230] and the original 2006 finding was instead due to a previously undetected contamination.[231] PLOS Pathogens retracted the XMRV article in 2012.[228]

Diagnosis

At present, an active area of research and non-clinically applied investigations involve non-invasive methods of prostate tumor detection. A molecular test that detects the presence of cell-associated PCA3 mRNA in fluid obtained from the prostate and first-void urine sample has also been under investigation. PCA3 mRNA is expressed almost exclusively by prostate cells and has been shown to be highly over-expressed in prostate cancer cells. The test result is currently reported as a specimen ratio of PCA3 mRNA to PSA mRNA.

Although not a replacement for serum PSA level, the PCA3 test is an additional tool to help decide whether, in men suspected of having prostate cancer (especially if an initial biopsy fails to explain the elevated serum PSA), a biopsy/rebiopsy is really needed. The higher the expression of PCA3 in the sample, the greater the likelihood of a positive biopsy; i.e., the presence of cancer cells in the prostate.[232]

See also

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