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Prostate cancer - Risk Factors

Description

An in-depth report on the causes, diagnosis, treatment, and prevention of prostate cancer.

Risk Factors:

The major risk factors for prostate cancer are age, family history, and ethnicity.

Age

Prostate cancer occurs almost exclusively in men over age 40 and most often after age 50. Two-thirds of prostate cancers are found in men over age 65. By age 70, about 65% of men have at least microscopic evidence of prostate cancers. Fortunately, the cancer is usually very slow growing and older men with the cancer typically die of something else.

Family History and Genetic Factors

Heredity plays a role in some types of prostate cancers. Men with a family history of the disease have a higher risk of developing prostate cancer. Having one family member with prostate cancer doubles a man's own risk, and having three family members increases risk by 11-fold. A specific gene, named HPC1 (for “hereditary prostate cancer”) is associated with this inherited type of the disease.

Scientists are researching other genetic variations that may increase prostate cancer risk.

A gene is a short segment of DNA which is interpreted by the body as a plan or template for building a specific protein. Genes reside within long strands of DNA which in turn make up the chromosomes.

Race and Ethnicity

African-American men have higher rates of prostate cancer than men of other races. They are also more likely to develop prostate cancer at a younger age and to have more aggressive forms of the disease. However, race alone does fully explain this difference. Prostate cancer is more common in North America and northern Europe, and less common in Africa, Latin America, and Asia. Diet and other factors may play a role. For example, Asians who live in the United States have a higher rate of prostate cancer than those who live in Asia.

Hormones

Male hormones (androgens), particularly testosterone, may play a role in the development or aggressiveness of prostate cancer. Other types of hormones, such as the growth hormone insulin-like growth factor-1 (IGF-1), may also be associated with some types of prostate cancer.

Inflammation and Infection

Researchers are studying whether prostatitis (inflammation of the prostate gland) may be associated with increased prostate cancer risk. They are also examining the possible relationship between prostate cancer and sexually transmitted infections, such as herpes virus and human papillomavirus, but no definite association has yet been found.

Dietary Factors

Because a Western lifestyle is associated with prostate cancer, so dietary factors have been intensively studied. Results have been inconsistent and inconclusive, however.

Fats. Some studies have found an association between high fat-intake and prostate cancer. In particular, high consumption of red meat and high-fat dairy products has been linked to increased risk for prostate cancer. In contrast, the omega-3 fats in fish may be protective.

Vegetables and Fruits. A diet rich in vegetables, fruits, and legumes appears to protect against prostate cancer. However, it is not clear whether this is due to the nutrients contained in these foods, or the fact that these foods are low in fat. No specific vegetable or fruit has been proven to decrease risk. Lycopene, which is found in tomatoes, has been a target of research interest, but the evidence for its protective benefit is still inconclusive.

Vitamins and Minerals. Major clinical studies have found that vitamin and mineral supplements (vitamin E, vitamin C, vitamin D, and selenium) do not prevent prostate cancer. Nutritious foods that are part of a healthy diet are the best sources for vitamins and minerals. A high intake of calcium has been linked to an increased risk of prostate cancer in some studies.

Click the icon to see an image of the sources of vitamin D.

Click the icon to see an image of the sources of vitamin E.

5-ARI Drugs for Prostate Cancer Prevention

Finasteride (Proscar, generic) and dutasteride (Avodart) are drugs used to treat benign prostatic hyperplasia (BPH). They block an enzyme that converts testosterone to dehydroepiandrosterone (DHEA), the form of the male hormone that stimulates the prostate. These medications belong to a drug class called 5-alpha-reductase (5-ARI) inhibitors.

In 2009, the American Society of Clinical Oncology (ASCO) and the American Urological Association (AUA) issued a joint guideline recommending that doctors discuss the pros and cons of the use of 5-ARIs for prostate cancer prevention with men who:

Have a PSA score of 3.0 or below
Are being screened yearly for prostate cancer
Do not yet show signs of prostate cancer

ASCO/AUA also recommended that patients who already take finasteride or dutasteride for controlling urinary symptoms of BPH should talk with their doctors about continuing to take the drug for prostate cancer prevention.

The guideline is the first to recommend drug therapy for preventing prostate cancer. It was based on results of a large 7-year clinical trial that showed that finasteride reduced the overall relative risk of developing prostate cancer by about 25%. However, in this study, a few more men who took finasteride developed a high-grade aggressive form of prostate cancer than the men who did not take finasteride. More recent studies have suggested that 5-ARI drugs may not increase the risk of developing aggressive cancer. It is still unclear if finasteride is an appropriate preventive approach, and not all doctors agree with the ASCO/AUA guideline.

Finasteride and dutasteride may cause reduced sexual drive and problems with erection during the first 1 - 2 years of use. It is not yet known what the long-term effects of 5-ARIs are if they are taken for longer than 7 years.

Resources

www.cancer.gov -- National Cancer Institute
www.cancer.org -- American Cancer Society
www.asco.org -- American Society of Clinical Oncology
www.cancer.net/portal/site/patient -- Cancer.Net
www.prostatecancerfoundation.org -- Prostate Cancer Foundation
www.urologyhealth.org -- Urology Health
www.nccn.org -- National Comprehensive Cancer Network
www.cdc.gov/cancer/prostate -- CDC Cancer Prevention and Control
www.psa-rising.com -- PSA Rising: Prostate Cancer Survivor Info
www.ustoo.org -- Us Too! Prostate Cancer Education and Support
www.cancer.gov/clinicaltrials -- Find clinical trials
www.zerocancer.org -- Zero -- The Project to End Prostate Cancer

References

Agency for Healthcare Research and Quality. Comparative effectiveness of therapies for clinically localized prostate cancer: executive summary no. 13. AHRQ Pub. No. 08-EHC010-1. February 2008.

American Urological Association. Prostate-specific antigen best practice statement: 2009 update. April 2009.

Andriole GL, Crawford ED, Grubb RL 3rd, Buys SS, Chia D, Church TR, et al. Mortality results from a randomized prostate-cancer screening trial. N Engl J Med. 2009 Mar 26;360(13):1310-9. Epub 2009 Mar 18.

Babaian RJ, Donnelly B, Bahn D, Baust JG, Dineen M, Ellis D, et al. Best practice statement on cryosurgery for the treatment of localized prostate cancer. J Urol. 2008 Nov;180(5):1993-2004. Epub 2008 Sep 25.

D'Amico AV, Chen MH, Renshaw AA, Loffredo M, Kantoff PW. Androgen suppression and radiation vs radiation alone for prostate cancer: a randomized trial. JAMA. 2008 Jan 23;299(3):289-95.

Gaziano JM, Glynn RJ, Christen WG, Kurth T, Belanger C, MacFadyen J, et al. Vitamins E and C in the prevention of prostate and total cancer in men: the Physicians' Health Study II randomized controlled trial. JAMA. 2009 Jan 7;301(1):52-62. Epub 2008 Dec 9.

Keating NL, O'Malley AJ, Smith MR. Diabetes and cardiovascular disease during androgen deprivation therapy for prostate cancer. J Clin Oncol. 2006 Sep 20;24(27):4448-56.

Kramer BS, Hagerty KL, Justman S, Somerfield MR, Albertsen PC, Blot WJ, et al. Use of 5-alpha-reductase inhibitors for prostate cancer chemoprevention: American Society of Clinical Oncology/American Urological Association 2008 Clinical Practice Guideline. J Clin Oncol. 2009 Mar 20;27(9):1502-16. Epub 2009 Feb 24.

Lawson KA, Wright ME, Subar A, Mouw T, Hollenbeck A, Schatzkin A, et al. Multivitamin use and risk of prostate cancer in the National Institutes of Health-AARP Diet and Health Study. J Natl Cancer Inst. 2007 May 16;99(10):754-64.

Lim LS, Sherin K; ACPM Prevention Practice Committee. Screening for prostate cancer in U.S. men ACPM position statement on preventive practice. Am J Prev Med. 2008 Feb;34(2):164-70.

Lin K, Lipsitz R, Miller T, Janakiraman S; U.S. Preventive Services Task Force. Benefits and harms of prostate-specific antigen screening for prostate cancer: an evidence update for the U.S. Preventive Services Task Force. Ann Intern Med. 2008 Aug 5;149(3):192-9.

Lippman SM, Klein EA, Goodman PJ, Lucia MS, Thompson IM, Ford LG, et al. Effect of selenium and vitamin E on risk of prostate cancer and other cancers: the Selenium and Vitamin E Cancer Prevention Trial (SELECT). JAMA. 2009 Jan 7;301(1):39-51. Epub 2008 Dec 9.

Litwin MS, Gore JL, Kwan L, Brandeis JM, Lee SP, Withers HR, et al. Quality of life after surgery, external beam irradiation, or brachytherapy for early-stage prostate cancer. Cancer. 2007 Jun 1;109(11):2239-47.

Loblaw DA, Virgo KS, Nam R, Somerfield MR, Ben-Josef E, Mendelson DS, et al. Initial hormonal management of androgen-sensitive metastatic, recurrent, or progressive prostate cancer: 2006 update of an American Society of Clinical Oncology practice guideline. J Clin Oncol. 2007 Apr 20;25(12):1596-605. Epub 2007 Apr 2.

Lu-Yao GL, Albertsen PC, Moore DF, Shih W, Lin Y, DiPaola RS, et al. Survival following primary androgen deprivation therapy among men with localized prostate cancer. JAMA. 2008 Jul 9;300(2):173-81.

National Comprehensive Cancer Network. NCCN clinical practice guidelines in oncology: prostate cancer. V.2.2009.

Sanda MG, Dunn RL, Michalski J, Sandler HM, Northouse L, Hembroff L, et al. Quality of life and satisfaction with outcome among prostate-cancer survivors. N Engl J Med. 2008 Mar 20;358(12):1250-61.

Schröder FH, Hugosson J, Roobol MJ, Tammela TL, Ciatto S, Nelen V, et al. Screening and prostate-cancer mortality in a randomized European study. N Engl J Med. 2009 Mar 26;360(13):1320-8. Epub 2009 Mar 18.

Shelley M, Wilt TJ, Coles B, Mason MD. Cryotherapy for localised prostate cancer. Cochrane Database Syst Rev. 2007 Jul 18;(3):CD005010.

Smith RA, Cokkinides V, Brawley OW. Cancer screening in the United States, 2009: a review of current American Cancer Society guidelines and issues in cancer screening. CA Cancer J Clin. 2009 Jan-Feb;59(1):27-41.

Thompson I, Thrasher JB, Aus G, Burnett AL, Canby-Hagino ED, et al. Guideline for the management of clinically localized prostate cancer: 2007 update. J Urol. 2007 Jun;177(6):2106-31.

U.S. Preventive Services Task Force. Screening for prostate cancer: U.S. Preventive Services Task Force recommendation statement. Ann Intern Med. 2008 Aug 5;149(3):185-91.

Van Patten CL, de Boer JG, Tomlinson Guns ES. Diet and dietary supplement intervention trials for the prevention of prostate cancer recurrence: a review of the randomized controlled trial evidence. J Urol. 2008 Dec;180(6):2314-21; discussion 2721-2. Epub 2008 Oct 18.

Walsh PC, DeWeese TL, Eisenberger MA. Clinical practice. Localized prostate cancer. N Engl J Med. 2007 Dec 27;357(26):2696-705.

Walter LC, Bertenthal D, Lindquist K, Konety BR. PSA screening among elderly men with limited life expectancies. JAMA. 2006 Nov 15;296(19):2336-42.

Wilt TJ, MacDonald R, Hagerty K, Schellhammer P, Kramer BS.Five-alpha-reductase inhibitors for prostate cancer prevention. Cochrane Database Syst Rev. 2008 Apr 16;(2):CD007091.

Wilt TJ, MacDonald R, Rutks I, Shamliyan TA, Taylor BC, Kane RL. Systematic review: comparative effectiveness and harms of treatments for clinically localized prostate cancer. Ann Intern Med. 2008 Mar 18;148(6):435-48. Epub 2008 Feb 4.

Reviewed last on: 8/5/2009
Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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