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Cumulative probability of grade ≥ 2 RP as a function of time from the start of radiation therapy by genotypes. (A) GSTP1 rs1695: Ile105Val; (B) XRCC1 rs25487: Arg399Gln. The Ile/Val and Val/Val genotypes of GSTP1 were associated with a statistically significant higher incidence of RP compared with other genotypes.
