washington u.s. senator john mccain recently return washington treatment brain cancer say sunday disease vicious treatment go well energy vicious form cancer face mccain republican run unsuccessfully president 2008 tell cnn state union program 80-year-old arizona senator find aggressive form brain tumor glioblastoma surgery july blood clot leave eye result far excellent mccain say treatment add prognosis pretty good face challenge face challenge confident get one well senator say side effect nothing except frankly increase level energy mccain recently complete first round chemotherapy radiation say would mri monday image technique use evaluate medical condition mccain chair senate arm service committee also go oversee work defense policy bill senate floor next week every life end one way another tell cnn add happy life include 2008 campaign lose former president barack obama able celebrate wonderful life grateful additional time mccain say add remember guy stand fifth bottom class naval academy mccain re-elected sixth senate term november past treat melanoma form skin cancer son grandson navy admirals u.s. navy pilot whose plane shoot vietnam 1967. spend five years prisoner war north vietnam torture repeatedly mccain say sunday hop people would remember someone serve country make lot mistake make lot errors serve country hope could add honorably u.s. senator mccain say face 'very vicious form cancer