Paraneoplastic syndrome refers to a group of symptoms caused by cancer cells that release hormones and other substances.

Scans found that the prostate cancer had spread to his liver and bones, and he had a new mass in his pelvis.

The doctors said it's important to recognize FAS and underlying paraneoplastic syndromes because they can be a sign that a cancer has developed into a more agressive type.

Doctors treated the man with two chemotherapy drugs and radiotherapy to his right leg to help manage the pain.

But after two cycles he went to hospital because he couldn't move his feet, and then his arms: The cancer had spread to his brain.

Case reports tend to shed light on unexpected symptoms, rare side effects, or innovative approaches to treatment, but usually more research is needed to support the findings.