Yongjun Zhang MM et al. investigated the potential association between SNPs in transglutaminase 5 (TGM5), phosphatidic acid phosphatase type 2B (PPAP2B) and proteasome subunit, alpha type 4 (PSMA4) and NSCLC susceptibility in Chinese patients who were non-smokers [25]. Here, PSMA4 is linked to non-small cell lung carcinoma.