Prostate cancer incidence in a large cohort of Peruvian men affiliated to a prepaid system.

Abstract

e12566 Background: Prostate cancer (PC) is the most common malignancy and the leading cause of death by cancer in Peruvian men (age-standardized rate [ASR] of 37 new cases/100,000 men estimated by GLOBOCAN 2008). The purpose of this study was to assess the incidence of PC in a cohort of men at Oncosalud, an oncologic pre-paid system that currently has 600,000 affiliates. Methods: We evaluated a dynamic cohort (period 1989 to 2011) of men affiliated to Oncosalud – Auna, an oncologic prepaid system.The crude incidence rate per year (number of new cases/men at risk), the specific rate according to age (number of new cases / persons-year), and cumulative risk were calculated. Results: Overall, during the assessment period, the PC incidence rate per year was 183.7 and the ASR incidence was 145 per 100,000 affiliates respectively. In our cohort of affiliates there were no PC cases before 1995 (with 3061 men at risk for that year). The highest incidence rate was 160.5 registered in 1999 (12,461men at risk). Incidence rates showed a decreasing tendency since 2008 (159.7 with a population at risk of 86,408 men), reaching its lowest value in 2011(92.3 with 213,531men at risk). According to age-groups, there were no PC cases under 35 years old except for the 20-24 year old group (incidence rate 2.3). Specific incidence rates per age-group increases from the 40 year old-group (38.5). The peak of PC incidence was between 75 to 79 years old (1506.05). In the same way, the cumulative risk increases after 40 years old. Conclusions: In our cohort of affiliates, the incidence of PC is greater than the general population, it could be due to the process of negative selection; on the other hand, specific incidence rates per age-group and cumulative risk are increased after 40 years, as seen in the general population.