together, they tipped off the office of barbara mcquaid. >> i remember the case came in on a friday afternoon. we had just received a tip from a whistleblower that there was a doctor prescribing chemotherapy for a patient that didn't have cancer. most of us were skeptical. about whether that would be try. >> just in case those stunning claims were true, she launched a team of investigators. what they found would surprise everyone. it seems like each story i hear is worse than the next one. >>> coming up -- >> i lost all my teeth. >> i had to have a liver transplant. >> he told me i was going to die. >> heart stopping stories, and a staggering revelation. >> i said that patients were being harmed, and he needs to be >> could all their pain have been prevented? when "dateline" continues. your dad w call teinor... i caou bac mom? s itsonathise... youa mom, u call at the time it'syou do ifanefteen ent me ar ice, switgeico. it what u do. e u?it vy udhe. you ng a a cl don't use ndex to ma windows spss andar! sy faeek ing 2 learw to uwind right way eituff noon w! o's ticket i do i'm caothpo erything

together, they tipped off the office of barbara mcquaid. >> i remember the case came in on a friday afternoonust received a tip from a whistleblower that there was a doctor prescribing chemotherapy for a patient that didn't have cancer. most of us were skeptical. about whether that would be try. >> just in case those stunning claims were true, she launched a team of investigators. what they found would surprise everyone. it seems like each story h >>> coming up -- >> i lost all my teeth. >> i had to have a liver transplant. >> he told me i was going to die. >> heart stopping stories, and a staggering revelation. >> i said that patients were being harmed, and he needs to be investigated. >> could all their pain have been prevented? when "dateline" continues. ♪ (cell phone rings) where are you? well the squirrels are back in the attic. mom? your dad won't call an exterminator... can i call you back, mom? he says it's personal this time... if you're a mom, you call at the worst time. it's what you do. if you want to save fifteen percent or more on car insura