We found that, among the 18 loci analyzed, three SNPs, i.e., rs4809957 in CYP24A1 at 20q13.2, rs36600 in MTMR3 at 22q12.2 and rs401681 in CLPTM1L at 5p15.33, were significantly (all P<0.05) associated with length of survival in SCLC patients (Table 2). Here, CYP24A1 is linked to small cell lung carcinoma.