question: KHi, may I answer your health queries right now ?  Please type your query here...my father was diagnosed in the last week or so with a Klatskins tumor.  After the lab report came back it said "negative for malignant cells".  He was jaunticed and that's why we sought help.  Malignancy was suspected in the doctors report prior to the procedure to place a stent.  Stent seems to be working for now.  My dad is 92.  we think the doctors worked on the premise that it was malignant during his hospital stay and we were even talked to about Hospice services, etc.  we know a tumor is not good and our doctor reminded us that the biopsy takes only a tiny sample of tissue and that there could be cancer somewhere in the bilary duct.  do we have reason to worry in the immediate future.  Is the diagnosis of negative for malignant cells "good news" or is this still a serious thing where the stent could obstruct again, etc.