[A case of rheumatoid factor associated with pancreatic carcinoma]

A case of adenocarcinoma of pancreas's tail, whose first manifestation was a prolonged fever syndrome, is presented. The only laboratory feature was the presence of a rheumatoid factor which appeared weeks before the diagnosis was made. There was no other pathology to justify its presence. The levels of RF decreased after the extirpation of the tumor and, coincidentally, with the clinical improvement. The level of RF was normal 4 months after the operation. The presence of RF in neoplasia and its possible relation to tumoral evolution is discussed.