PTPN2 and squamous cell carcinoma: Analysis of summary data of 6 published genome-wide associated studies (GWAS) with 12,160 cases and 16,838 controls identified 11 independent SNPs of 8 genes, of which PTPN2 SNPs rs2847297 and rs2847282 may be the potential susceptible loci for the risk of getting lung cancer in the European population, particularly among ever smokers and squamous carcinoma [68].