Response to "Stereotactic ablative radiotherapy in the framework of classical radiobiology: response to Drs. Brown, Diehn, and Loo." (Int J Radiat Oncol Biol Phys 2011;79:1599-1600) and "Influence of tumor hypoxia on stereotactic ablative radiotherapy (SABR): response to Drs. Mayer and Timmerman." (Int J Radiation Oncol Biol Phys 2011;78:1600).