Carcinoid tumor caused by drinking a lot of CS?

Our family has been using CS for almost 8 years. Introduced it to relatives and friends. Absolutely convinced about its safety till recently--sister in law, who's also an avid user, got colon carcinoid or carcinoid cancer not long after appendectomy. So here's a tough question...Anyone here noticed that carcinoid is thought to arise from the enterochromaffin cells (Kulchitsky) , which "feed on" silver? We did research on Chinese first and not much on it in English yet but I think this is the case. If it's not obvious enough, the question I'm actually asking is: can drinking a lot of CS (this is her case) cause this kind of cancer? I couldn't find anything yet... Tweet