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MS, Chung DC: Hypoxia activates the K-ras proto-oncogene to stimulate angiogenesis and inhibit apoptosis in colon cancer cells. PLoS One 2010, 5:e10966.PubMedCrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions PZ carried out the proliferation, cell cycle and apoptosis assay, participated in drafted the manuscript. YN carried out the invasion experiment, participated in experiment design and drafted the manuscript. LY conceived of the study, participated in its design and coordination, performed the statistical analysis and helped to draft the manuscript. MC carried out the telomerase activity assay, participated in the draft Methamphetamine preparation. CX participated in the design of the study and performed the statistical analysis. All authors read and approved the final manuscript. Authors’ informations PZ, M.D., medical master candidate, Dept. Gynecology, Obstetrics & Gynecology Hospital, Fudan University; senior medical registrar, Dept. Obstetric & Gynecology, Shangyu City Hospital; YN, M.D. & Ph.D., assistant professor, Dept. Physiology & Pathophysiology, Shanghai Medical College, Fudan University; LY, M.D. & Ph.D., associate professor & medical consultant, Dept. Gynecology, Obstetrics & Gynecology Hospital, Fudan University; MC, M.B., medical master candidate, Dept.