joshua schiffman was the lead researcher on the study. doctor very good to have you with us. you are a peed yacht crick oncologist. a cancer survivor urs yourself. yourself. how did you decide to focus on elephants? >> we try to focus on this question of who develops cancer, and why? are a few is years ago i had an opportunity to tenant a meeting on evolution of cancer and heard that cancer rarely hav develop cancer, and possibly because of the extra copy of p-53 as you mentioned. it wasn't until a few weeks later that i returned home and i was believe it or not visiting our local utah hobo zoo with my children. they checked the elephants every week to determine about they were healthy. >> cells replicate, the dhansess of genetic splaiks. what do you find that these genes can help the elephants attack and kill the cancer cells. >> exactly. whether we took the blood from the zoo animals and rin ringling brothers, barnum and bailey circus, the elephants eliminated that cell as opposed to humans, where the cells kept replicate approximating. >> elephants can live to 200 years. d