ABCC2 and acute lymphoblastic leukemia: As shown in Table 2, in a total of 112 childhood ALL patients, distribution of the ABCC2 −24C>T polymorphism (rs717620) genotypes were as follows: CC (wild type), n = 38 (33.9%); CT (heterozygous), n = 66 (58.9%); TT (homozygous), n = 8 (7.2%).