TP53 and neoplasm: A logistic regression model predicting tumor p53+ status based on smoking among cases only is:(1)log[P(Y)/(1−P(Y))]=α+βXiwhere Y represents a case with the p53 mutation and Xi represents whether subject i was a current smoker and eβ = θCase-Only = θ1/θ2, which can equivalently be estimated from the case-only analyses or case-control analyses of the same case series.