Ontario Ombudsman Andre Marin says he will investigate the way the provincial Health Ministry approves funding for the drug Herceptin.
His announcement today comes after a woman was denied funding for the drug because her tumor was too small.
Health Minister Deb Matthews says she welcomes Marin's investigation and her department will co-operate with it.
Matthews says the health ministry and Cancer Care Ontario are looking into what can be done when patients have a condition that is not black and white.