Peking University Cancer Hospital and Institute 1 article published in JoVE Cancer Research Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines Xin Sui1, Jian-Hao Geng1, Hui-Ming Yu1, Yong-Heng Li1, Wei-Hu Wang1 1Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital and Institute The presence of cancer stem cells have been associated with relapse or poor outcomes after radiotherapy. This manuscript describes the methods to study the radiosensitivity of cancer stem cells in lung cancer cell lines.