Previous studies have shown that ectopic expression of CD9 in small cell lung cancer (SCLC) cells represses integrin β1-dependen cell motility (Funakoshi et al., 2003) and facilitates apoptotic cell death via the inactivation of PI3K/Akt signaling (Saito et al., 2006). The gene discussed is CD9; the disease is small cell lung carcinoma.