[Salvage radiotherapy outcomes for biochemical recurrence following radical prostatectomy among the African-Caribbean population of Guadeloupe].

OBJECTIVES To make the first analysis of the salvage radiotherapy outcomes for biochemical recurrence of prostate cancer after radical prostatectomy in African descendant people, witch has no healthcare access difficulties: the French West-Indies African-Caribbean people of Guadeloupe. PATIENTS AND METHOD Ninety successive patients, with biological failure after radical prostatectomies were treated in the University Hospital of Pointe-à-Pitre with salvage radiotherapy between April 2003 and December 2008. The retrospective study analysed the biochemical disease free survival (bDFs) after irradiation with Kaplan-Meier method, and the independent predictors of bDFs using the Cox model, with P<0.05. The treatment failure was defined for PSA superior or equal to nadir +0.1 ng/mL. RESULTS The median dose was 64 Gy. At the median follow-up of 24.63 months, 35 (38.9%) patients had biochemical recurrence. The median bDFs was 55.3 months, the bDFs probabilities at months 12, 24, 36 and 48 were 8.1%, 70.3%, 61.9% and 56.1%. Multivariate analysis determined that the independents predictors of treatment failure were the seminals vesicles invasion (P=0.0094, Hazard ratio=2.63 CI 95%: [1.28-5.55]), the PSA velocity superior or equal to 0.75 ng/mL per year (P=0.0002, Hazard ratio=3.88 CI95%: [1.86-7.75]) and the pre-irradiation PSA level superior or equal to 1.5 ng/mL (P=0.0093, Hazard ratio=2.89 CI95%: [1.30-6.45]). CONCLUSION Salvage radiotherapy for African descendent people with no healthcare difficulty access was an efficient treatment for the biochemical recurrence and had the same outcomes than others Caucasian people.