RARB and non-small cell lung carcinoma: Notably, a study by Li et al. examining the association of RAR-β gene methylation in 167 non-small cell lung cancer (NSCLC) patients and 105 controls revealed no relationship between gene methylation to sex (Chi-square p = 0.052; logistic regression, p = 0.074, OR = 0.46, 95% CI = 0.193–1.094) [35].