To assess the contribution of HR to DNA DSB repair, we analyzed the proportion of Rad51 positive (Rad51 +) cells in the population of FACS-enriched CD44high/CD166high cancer stem-like (CSC) and non-CSC (CD44low/CD166low) populations of MFR-surviving and their parental NSCLC cells. Here, RAD51 is linked to non-small cell lung carcinoma.