Methadone is a strong pain medication belonging to the opioid family. In this trial, it is used as an additional pain reliever alongside other opioid medications that patients are already taking. It works by binding to specific receptors in the brain to help control severe pain, particularly in patients with bone pain caused by cancer that has spread.

Morphine is a powerful opioid pain medication used to treat severe pain. It is one of the most commonly used medications for managing cancer-related pain. It works by changing how the body senses and responds to pain signals.

Both medications are being studied to determine which one is more effective at reducing pain when added to existing pain treatment plans for patients with bone pain from metastatic cancer.

Bone Metastasis – A condition where cancer cells spread from their original location to the bones, forming new tumors. These cancer cells typically travel through the bloodstream or lymphatic system to settle in bone tissue. The condition often affects multiple bones simultaneously, particularly the spine, pelvis, ribs, skull, and long bones of the arms and legs. Bone metastasis can cause the affected bones to weaken and become more susceptible to structural changes. The condition commonly leads to pain that may start gradually and become more persistent over time.

Cancer Pain – A complex physical sensation that occurs as a direct or indirect result of cancer presence in the body. It can range from mild to severe and may be constant or intermittent. Pain can arise from the tumor itself pressing on bones, nerves, or organs, or from cancer spreading to other parts of the body. The sensation can vary in nature, presenting as sharp, dull, aching, burning, or pressure-like discomfort.