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Int J Radiat Oncol Biol Phys. 2011 Jul 15;80(4):1056-63. doi: 10.1016/j.ijrobp.2010.03.049. Epub 2010 Dec 14.

70 Gy versus 80 Gy in localized prostate cancer: 5-year results of GETUG 06 randomized trial.

Author information

1
Centre Alexis Vautrin, Vandoeuvre les Nancy, France. v.beckendorf@nancy.fnclcc.fr

Abstract

PURPOSE:

To perform a randomized trial comparing 70 and 80 Gy radiotherapy for prostate cancer.

PATIENTS AND METHODS:

A total of 306 patients with localized prostate cancer were randomized. No androgen deprivation was allowed. The primary endpoint was biochemical relapse according to the modified 1997-American Society for Therapeutic Radiology and Oncology and Phoenix definitions. Toxicity was graded using the Radiation Therapy Oncology Group 1991 criteria and the late effects on normal tissues-subjective, objective, management, analytic scales (LENT-SOMA) scales. The patients' quality of life was scored using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire 30-item cancer-specific and 25-item prostate-specific modules.

RESULTS:

The median follow-up was 61 months. According to the 1997-American Society for Therapeutic Radiology and Oncology definition, the 5-year biochemical relapse rate was 39% and 28% in the 70- and 80-Gy arms, respectively (p = .036). Using the Phoenix definition, the 5-year biochemical relapse rate was 32% and 23.5%, respectively (p = .09). The subgroup analysis showed a better biochemical outcome for the higher dose group with an initial prostate-specific antigen level >15 ng/mL. At the last follow-up date, 26 patients had died, 10 of their disease and none of toxicity, with no differences between the two arms. According to the Radiation Therapy Oncology Group scale, the Grade 2 or greater rectal toxicity rate was 14% and 19.5% for the 70- and 80-Gy arms (p = .22), respectively. The Grade 2 or greater urinary toxicity was 10% at 70 Gy and 17.5% at 80 Gy (p = .046). Similar results were observed using the LENT-SOMA scale. Bladder toxicity was more frequent at 80 Gy than at 70 Gy (p = .039). The quality-of-life questionnaire results before and 5 years after treatment were available for 103 patients with no differences found between the 70- and 80-Gy arms.

CONCLUSION:

High-dose radiotherapy provided a better 5-year biochemical outcome with slightly greater toxicity.

PMID:
21147514
DOI:
10.1016/j.ijrobp.2010.03.049
[Indexed for MEDLINE]

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