Dear Annie
Dear Annie: Last year, I lost my dad. He had stage IV cancer, but that's not what killed him. In fact, after his first few months of chemotherapy, a scan showed that the cancer was mostly gone. Then, a few weeks later, he died suddenly in his sleep. We declined to do an autopsy, but from talking to doctors it seems that there's a good chance it was a blood clot.
I have since learned that there…