>> couric: welcome to the program, i'm katie couru c filling in for carlie rose. topt for the our, a look at advances in cancer research today. we'll talk to scientists louise perkins, bill knellson and neil segal and tomorrow marsilje. >> i could here the one who did the colon os scope, your husband has colon cancer, we need to schedule emergency surgery so i went from the highest of highs to the lowest of lows. i was crying saying there are a few things that scare me in life but cancer is one of them. and it was june 4, 2012. i will never forget that date for the rest of my life. that is true of most cancer patients, they never forget the day they were diagnosed. >> couric: a discussion about cancer for the hour next.