Renal carcinoma. By the time his doctor found the cause of his weight loss, it was in stage 4 and had metastasized to just about everywhere in his body. He worked in a paper mill for decades and was probably exposed to who knows what chemicals. That plant closed when OSHA said they had to implement more safety precautions. The photo was taken at our "old" house and he was in his early 40s and got an interest in CB radio.