Risk of subsequent primary cancers by primary treatmenta for prostate cancers diagnosed between 1993 and 2011.

#P aTreatment was considered to have been for the original prostate cancer if it was given within 4 months of its diagnosis.SIR, standardized incidence ratio; O, observed number of second primary cancers; E, expected number of second primary cancers; O/E, ratio of observed number of second primary cancers to the number of expected cancers; 95% CI, 95% confidence interval; CNS, central nervous systemRisk of subsequent primary cancers by primary treatmenta for prostate cancers diagnosed between 1993 and 2011.