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Prostate cancer - Staging and Grading

Description

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

Staging and Grading:

Staging and Grading

A pathologist will read the biopsy report and assign a grade to the tumor cells. The Gleason system classifies and scores the cancers cells based on their microscopic appearance. Based on the grade, PSA test, digital rectal exam, and possibly imaging tests, the doctor stages the cancer. Staging refers to how far the cancer has spread. The stage and grade of cancer can help the doctor advise on treatment options.

TNM Staging System

A tumor's stage is an indication of how far it has spread from its original site. Cancers are staged according to whether they are still localized (still within the prostate gland) or have spread beyond the original site. The current prostate cancer staging system is the TNM system.

The TNM system refers to clinical tumor stages as:

  • T for tumor
  • N for regional lymph nodes
  • M for metastasis (tumors developing outside the prostate)

T Stages

T followed by numbers 0 through 4 refers to the size and extent of the tumor itself.

Stage, T1 - T4

Description

T1

The tumor cannot be felt or seen using imaging techniques.

T1a. Cancer cells are incidentally found in 5% or less of tissue samples from prostate surgery unrelated to cancer.

T1b. Cancer cells found in more than 5% of samples.

T1c. Cancer cells identified by needle biopsy, which is performed because of high PSA levels.

T2

The cancer is confined to the prostate but can be felt as a small well-defined nodule.

T2a. Tumors are in half a prostate lobe.

T2b. Tumors are in more than half a lobe.

T2c. Tumors in both lobes.

T3

The tumor extends through the prostate capsule.

T4

The tumor is fixed to or invades adjacent structures.

N Stages

N followed by 0 through 3 refers to whether the cancer has reached the regional lymph nodes, which are located next to the prostate in the pelvic region.

Stage, N0 - N3

Description

N0

Regional lymph nodes are still cancer-free.

N1

A small tumor is in a single pelvic node.

N2

A medium-size tumor is in one node, or small tumors are in several nodes.

N3

A large tumor is in one or more nodes.

M Stages

M stages refer to metastasis (tumors developing outside the prostate).

Stage

Description

M0

Metastasis has not occurred (cancer has not spread beyond the regional lymph nodes).

M1a

Cancer has spread to lymph nodes beyond the regional lymph nodes.

M1b

Cancer has invaded the bones.

M1c

Cancer has spread to other sites.

The Gleason Grading System

Tumors are assigned scores according to a scale known as the Gleason system, which measure how well or how poorly organized the cancer cells are under the microscope. The first step is to grade the tumors:

  • Grade 1: Single, well-packed tumors
  • Grade 2: Single, more loosely arranged and less uniform tumors
  • Grade 3: Single tumors of different sizes and patterns, with cellular breakdown becoming increasingly worse
  • Grade 4: Irregular tumor masses, fused together; may show clear cells
  • Grade 5: The tumors have broken down and cellular structure has markedly deteriorated

Two-thirds of prostate cancers have a mix of tumor grades. To determine a prognosis, two numbers are assigned, representing the dominant grade and then the minor grade. The cancer is then "scored" by adding the dominant grade plus the minor grade. For example, a tumor with a dominant grade of 3 and a minor grade of 4 are given a Gleason score of 7. The following scores are often used to suggest how well or poorly the tumor is differentiated. The higher the score, the more severe the break-down of their cellular structure and the more likely they are to spread aggressively:

  • Score 2 - 4: Well-differentiated. Indicates about a 95% chance for surviving 15 years without aggressive treatment.
  • Score 5 - 6: Moderately well differentiated. Slightly lower chance of survival that decreases with time.
  • Score 7 - 10: Moderately poorly to poorly differentiated, with 15-year survival rates of 15 - 40%.

Resources

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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