>> guest: gbm. c-span: you use that a lot where the percentages all lot today? >> guest: thank-you. every time make go into the operating room to find myself with that dilemma no wing guy and in front of this massive killer because it kills thousands and thousands of people every year this type of cancer alone justice specifically this one i know i am the underdog when i fight that fight my patience trust me with my life i go with all the passion and the knowledge to the energy i take as much as i can safely i will wait to see i can take as much as i can. the odds are against me making an incredible difference at the end of the day because the bottom line the diseased is devastating it keeps growing but i never lose hope. every patient every surgery for that type of cancer i always hope that this will be the patient that will defeat the deceased and from that patient we will learn and make history for a mother -- for many other patients to come and i have a feeling in my heart every single time i into that arena in the operating room. hope is the last thing i hope i will ever lose.

expectations that you are going to save their loved ones, you know, from brain cancer, for instance, from the gbm. and i have had a few patients like this. and i think that the worst thing that a family do to a physician sometimes that i have personally -- i don't know, i cannot speak for all the physicians, but to me, one of the most devastating things i have experienced is i am always the last one to give hope. but we reach a point in which we do things to patients that instead of helping them, i think they're working against them. once we reach that end of life where we know that nothing is working and the disease continues to progress, the worst thing that i have experienced moist from the family -- myself from the family members of a patient is their inability to realize that no matter what we do, things are not going to change. and they are willing to see their loved ones continue to suffer rather than deal with their own inabilities to cope with the fact that their loved ones are going to the die, and that breaks my heart. and i struggle, and i meet with them, and i say, please, you know,