. >> reporter: heat ta bro >> reporter: leita brown is a married teacher who went to see the doctor about a st on her leg that wouldn't go away and pretty soon had a tor the size of a football. doctors diagnosed metastasic melanoma and it was spreading. >> i had it in my intestines and lungs. >> reporter: caused by sun exposure and frequ sunburns as a child. >> i went through those ranges of emotions of being terrified and scared and sad and a little bit angry. >> reporter: she signed a georgetown's cancer center. it doesn't have a high survival rate. >> it has taken this ccer that had only a 10% chance of people being alive at two years and chanhang thate of survival to 60, 70 or 80%. >> 3 to 4 months into the clinical trial i was alr dy showing no evidence of disease. >> reporter: leita brown's story is remarkable but not entirely rare. skin cancer cases are on the rise. the world health organization edicts a 10% increase by 2050 as temperatures continue to warm. >> as there's been an increase in depleti of o-zone area we are seeing a higher degree of the light coming to meet us on eart