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Vol. 1 No. 2 March 2001 www.wmfurology.com
New Thoughts on Prostate Cancer Treatment Stephan L. Werner, MD, FACS
Classic urologic teaching has been there is no significant outcome difference whether hormonal therapy is initiated early or late in the course of prostate cancer, (PCa). Although this was counterintuitive there were no significant data to suggest otherwise. With the conclusion of several recent studies there is developing reason to consider early treatment in more cases. Current uro-oncologic thinking is moving towards the addition of early adjuvant therapy In patients with intermediate and high risk PCa. Several factors may contribute to risk, and different studies have defined risk differently, but a pattern emerges: how much cancer is present, is it localized to the prostate, how aggressive are the cells, is there spread to the lymph nodes, is there distant spread? Gleason grading characterizes the aggressiveness of the cells by their appearance under the microscope, and is given in a range from 2, (low), to 10 (high). Most PCa is grade 6. Staging ranges from A to D with Stages A and B confined to the prostate, Stage C indicating local spread and Stage D, distant spread. PSA levels below 10 are considered low risk. Definitions of risk vary somewhat but for this discussion we will consider:Low risk: Stage A or B and Gleason grade 6 or less, and PSA 10 or less. Intermediate risk: Stage A or B, and Gleason grade 7 or PSA 10 to 20 (100?). High risk: Stage A or B and Gleason grade 7 and PSA greater than 10; or Stage A or B and Gleason grade 8 or higher; or Stage C or D. Primary therapy: Treatment of the cancer in the prostate by surgery, external beam radiation or brachytherapy, (seeds), or cryotherapy. Hormonal therapy: Treatment to reduce testosterone levels, (which act as "fertilizer" to PCa), by removal of the testicles; use of drugs that block production, (Zolodex/Lupron); or by drugs that block the action of testosterone, (Casodex/Nilandrone/Eulixin). Combined Androgen Blockade (CAB): Combination of testosterone reducers and blockers. Chemotherapy: Use of non-hormonally active drugs against the cancer. Neoadjuvant therapy: Hormonal or other drug treatment started before primary therapy. Adjuvant therapy: Hormonal or other drug therapy started at or after primary therapy. Low risk patients are usually treated with primary therapy alone. However, if surgery is the primary therapy, the pathologic findings may move a low risk cancer into a higher group. Studies have now begun to show that intermediate risk patients may do significantly better, as a group, when long term, (3 years +), adjuvant hormonal therapy is added to their treatment. This is a significant change in treatment philosophy. The patient should participate in the decision as the side effects are not insignificant. There are also strong data suggesting much more aggressive early therapy for high risk PCa. In the past many of these patients were not treated aggressively early. Studies now suggest aggressive early treatment with neoadjuvant therapy prior to radiation or surgery, primary therapy by surgery or combined external radiation, and brachytherapy, or cryotherapy, and long term CAB or other regimens will improve long term survival or disease free intervals for many. There are many ongoing research protocols to improve results. Recurrent PCa after primary therapy poses many challenges. Evaluation of rising PSA levels may require bone scans, CT/MRI studies, repeat biopsies, or prostascint scans to evaluate the site of recurrence. Hormonal therapy is usually instituted, When recurrence is localized to the prostate bed, secondary treatments such as radiation after surgery, or salvage prostatectomy after radiation, or cryotherapy may be used in addition to hormonal therapy, in hope of achieving a secondary cure. Some prostate cancers become resistant to hormonal therapy, (HRPC), again presenting treatment challenges. Secondary hormonal manipulation with cycling of anti-androgens, or addition of ketoconazole may help. Various chemotherapy regimens using mitoxantrone and prednisone, or taxotere may be effective. Many other protocols with other drugs, including thalidomide and PC-SPES are in progress. PC-Spes is a non-controlled herbal treatment that has come into use in the treatment of PCa. It is a combination of 8 American and 1 Chinese herb. It has strong estrogenic effects and does suppress PCa. It has been minimally studied and should not be taken cavalierly as it poses a danger due to a significant incidence of adverse blood clotting events such as strokes, heart attacks, emboli, and thrombophlebitis. At this point it should only be used for patients with hormone refractory prostate cancer, (HRPC). Patients electing to use this drug MUST tell their physician, and should be on blood thinners as well. The increasingly aggressive approach to the treatment of PCa is saving and extending lives as seen in the decreasing death rate. There is much more to do. wmfurology.communicator is an occasional informational letter for the education of the reader, it should not be used as a guide to treatment. ©Werner - Francis Urology Associates llc - Mid Atlantic Urology Associates llc PA, Greenbelt MD Rev:3/01 [Top] [communicator index] [PCa Webmap] |
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