Residual Prostate Cancer in Patients Treated with Endocrine Therapy with or Without Radical Radiotherapy: A Side Study of the SPCG-7 Randomized Trial.
2011 (English)In: International journal of radiation oncology, biology, physics, ISSN 1879-355X, Vol. 80, no 1, 55-61 p.Article in journal (Refereed) Published
PURPOSE: The Scandinavian Prostate Cancer Group-7 randomized trial demonstrated a survival benefit of combined endocrine therapy and external-beam radiotherapy over endocrine therapy alone in patients with high-risk prostate cancer. In a subset of the study population, the incidence and clinical implications of residual prostate cancer in posttreatment prostate biopsy specimens was evaluated.
METHODS AND MATERIALS: Biopsy specimens were obtained from 120 of 875 men in the Scandinavian Prostate Cancer Group-7 study.
RESULTS: Biopsies were performed at median of 45 months follow-up. In 63 patients receiving endocrine treatment only and 57 patients receiving combined treatment, residual cancer was found in 66% (n = 41) and 22% (n = 12), respectively (p < 0.0001). The vast majority of residual tumors were poorly differentiated (Gleason score >/=8). Endocrine therapy alone was predictive of residual prostate cancer: odds ratio 7.49 (3.18-17.7), p < 0.0001. In patients with positive vs. negative biopsy the incidences of clinical events were as follows: biochemical recurrence 74% vs. 27% (p < 0.0001), local progression 26% vs. 4.7% (p = 0.002), distant recurrence 17% vs. 9.4% (p = 0.27), clinical recurrence 36% vs. 13% (p = 0.006), cancer-specific death 19% vs. 9.7% (p = 0.025). In multivariable analysis, biochemical recurrence was significantly associated with residual cancer: hazard ratio 2.69 (1.45-4.99), p = 0.002, and endocrine therapy alone hazard ratio 3.45 (1.80-6.62), p < 0.0001.
CONCLUSIONS: Radiotherapy combined with hormones improved local tumor control in comparison with endocrine therapy alone. Residual prostate cancer was significantly associated with serum prostate-specific antigen recurrence, local tumor progression, clinical recurrence, and cancer-specific death in univariable analysis. Residual cancer was predictive of prostate-specific antigen recurrence in multivariable analysis.
Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 80, no 1, 55-61 p.
Prostate cancer, Radiotherapy, Endocrine therapy, Posttreatment biopsy, Outcome
Cancer and Oncology
Research subject Medicine; Oncology
IdentifiersURN: urn:nbn:se:umu:diva-41776DOI: 10.1016/j.ijrobp.2010.01.072PubMedID: 20598453OAI: oai:DiVA.org:umu-41776DiVA: diva2:407763