Possible 100% effective breast cancer combo vaccine/cure.
http://news.bbc.co.uk/2/hi/health/8714085.stmCauses the immune system to attack a protein present in tumors and in lactating tissue. So once you're at an age where you're done breastfeeding, you can get the shot. Will prevent new tumors and also stop the growth of existing tumors.
No human trials have been done, but it's 100% effective in mouse trials