Thy-1 and αSMA were detected in tumor stroma by immunohistochemical analysis of human lung cancers (Fig. 1), and quantification of cells that express Thy-1 or αSMA within multiple microscopic fields showed that their levels were positively correlated (P = 0.018, r = 0.665) (Fig. 2). The gene discussed is ACTA1; the disease is lung carcinoma.