Fig. 6

a Tumorsphere assay in sorted CD133⁺ vs CD133⁻ cells. Average numbers of tumorspheres are depicted. Note nearly 2–3-fold increased ability to form spheres in CD133⁺ cells. b Chemosensitivity assay to cisplatin in the four cells lines comparing CD133⁺ vs CD133⁻ cells. No appreciable differences in sensitivity was observed