Conversation: The conversation between human and AI assistant.
[|Human|] what type of cancer kills people the fastest? my older sister died in february of 2012 of a metastatic cancer of unknown origin, after being diagnosed in december 2011. first suspected was liver then pancreatic then doctors did not know what type of cancer it was. cause of death was metastatic cancer of unknow origin no autopsy was performed.
[|AI|]  Hi thanks for your question. I feel sorry for your sister died of metastatic cancer, of unknown origin. The fastest spreading cancers are sarcomas, which usually involve blood vessels, but your in case of your sister sarcoma is not a possibility. As metastatic lesion was first in liver, then pancreas. Years of survival depend upon, at what stage cancer was diagnosed, may be in case of your sister, the diagnosis was very late, say at stage 3 or 4. Pancreatic tumors (cancer) itself are known for rapid growth, quick spread and high mortality. Since the autopsy of your sister was not done, so we don't know type of cancer, and it cannot say with certainty, was it slow growing type of cancer or fast-growing type of cancer?