BTLA and non-small cell lung carcinoma: In never alcohol and BMI ≥ 24 kg/m2 subgroup, it was found that similar genotype variants of BTLA rs1982809 might be a protective factor of NSCLC (never smoking subgroup: GA vs. GG: P = 0.013; AA/GA vs. GG: P = 0.016; BMI ≥ 24 kg/m2: GA vs. GG: P = 0.030; AA/GA vs. GG: P = 0.041).