In the reduced model of multivariable analysis, developed with the backward variable selection method, only lymph node involvement (adjusted OR (95% CI): 9.90 (1.91–51.37), p = 0.0064) and bone metastasis (adjusted OR (95% CI): 9.91 (1.62–60.61), p = 0.0131) remained the independent predicting factors for concordant EGFR mutation test results in liquid/tissue biopsy (Table A3). The gene discussed is EGFR; the disease is bone metastasis.