From a NYDailyNews.com article:
The vaccine, effective against deadly cancers in areas of the body like the breast, bowel and cervix, is being tested on some patients, according to the Daily Mail. The vaccine, which is being developed with Celldex Therapeutics, a U.S. company, revs up the immune system and tells it to destroy a hormone called hCG. That hormone, normally present only during pregnancy, is also made by about half of patients who have bladder and pancreatic cancer, and some people who have breast, bowel, ovarian and cervical tumors.
The shot shrinks the tumors and stops them from spreading.
“Not only are you causing the cancer to shrink, it is not metastazising,” Middlesex University Professor Ray Iles, creator of the vaccine, told the Daily Mail. “If you come in with chemotherapy and surgery, you’ve got a cure.”