MSI1 and squamous cell carcinoma: Msi1 mRNA expression in lung cancer bronchoscopic biopsy specimens. Msi1 mRNA was determined by qRT-PCR. Ad, adenocarcinoma; Sq, squamous cell carcinoma; SCLC, small cell lung carcinoma; Other, mucoepidermoid carcinoma or malignant. mesothelioma. * χ2 test