A Disturbance in the Neighborhood
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I think I’ll stick with my “theory” (for which I have no scientific evidence-other than anecdotal): cancers-generally-are caused by “viroid” cells (cells which have viral characteristics),which can adapt themselves to infect any organ.
Removing an area in which these cells have been active-by surgery,radiation, or chemo- “frees” them to infect new areas via rapid adaptation.
For certain cancers -such as ovarian- the “best”-and most ethical treatment is palliation : keep the patient as comfortable as possible right up to the end.