Chemotherapy and radiation can cause heart damage. My mother, who didn’t have a history of heart trouble, had a minor heart attack while undergoing chemo for non-Hodgkins lymphoma. I am happy to say that she’s been in remission for over 10 years and is doing well.
My father in law had both, but didn't survive. He passed away a year after my husband and I were married, six months after he was diagnosed.