Experimental immunotherapy treatment changes lives for cancer patients in small trial

About a month before giving birth, Kelly Spill said she noticed something wasn't right. When using the bathroom, she reported "seeing blood," and the problem persisted for months after she gave birth. 

"I had a gut feeling that it was going to be cancer," she told CBS News chief medical correspondent Dr. Jon LaPook. "I just knew."

A colonoscopy later confirmed her suspicions, and a specialist told Spill that she had colorectal cancer, which most likely meant she would not be able to have another child due to the effects of chemotherapy, radiation and surgery.