Efficacy of HSPB1, GSTP1, and CKB in discriminating NBE from preneoplastic lesions(SM, AH, and CIS) from invasive LSCC. Receiver operating characteristic (ROC) curves of HSPB1, GSTP1, and CKB in discriminating NBE from preneoplastic lesions (A), NBE from invasive LSCC (B), and preneoplastic lesions from invasive LSCC (C), individually and as a panel.