of marginal significanceP = 0.062
STK11 and PTEN mutations in non-smokers were lower than in smokers, but the difference was of marginal significance [2.1% (1/48) and 6.3% (7/112) vs. 13.2% (7/53) and 13.0% (14/108), X 2 = 4.274 and 2.87, P = 0.062 and 0.09, respectively].