We next analyzed two independent SCLC patient cohorts to control for patient and tumor heterogeneity which, respectively, contained seven normal tissues and 79 SCLC tissues [45], and 24 adjacent normal and SCLC tissues [46], and found diminished Slit2 levels in SCLC tumors (Fig. 1B,C). The gene discussed is SLIT2; the disease is small cell lung carcinoma.