Bone Metastases

Bone metastases happen when cancer cells spread from their original site to the bones. This is also called metastatic bone disease or secondary bone cancer. The cancer cells travel through the bloodstream or lymph system and form new tumors in bone tissue. Bone metastases are not the same as primary bone cancer, which starts in the bone itself.

The most common cancers that spread to bones are breast, prostate, lung, kidney, and thyroid cancer. When cancer reaches the bones, it disrupts the normal process of bone breakdown and rebuilding. This can weaken bones and cause pain, fractures, and elevated calcium levels in the blood. Bone metastases most often affect the spine, pelvis, ribs, skull, and long bones of the arms and legs.

Blood tests can help detect and monitor bone metastases by measuring biomarkers that reflect bone turnover. Alkaline phosphatase, or ALP, rises when new bone forms at metastatic sites. C telopeptide, or CTX, increases when bone breaks down faster than normal. Together, these markers provide insight into how cancer is affecting bone health and how treatment is working.

• Bone pain that may worsen at night or with activity
• Fractures from minor injuries or normal activity
• Weakness in the legs or arms
• Loss of bladder or bowel control if spine is affected
• Numbness or tingling in limbs
• High calcium levels causing nausea, confusion, or extreme thirst
• Fatigue and loss of appetite
• Unexplained weight loss

Some people with early bone metastases have no symptoms at all. Bone pain is often the first sign that cancer has spread to the bones. Regular monitoring is important for anyone with a cancer diagnosis that commonly spreads to bones.

Bone metastases develop when cancer cells break away from the primary tumor and travel to bone tissue. Breast cancer, prostate cancer, and lung cancer account for most cases of bone metastases. Once cancer cells reach the bone, they disrupt the balance between osteoblasts, which build new bone, and osteoclasts, which break down old bone. This imbalance causes bone damage and triggers the release of substances that help tumors grow.

Risk factors include having an advanced stage of cancer, certain cancer types with high rates of bone spread, and not receiving early treatment for the primary cancer. Hormone-related cancers like breast and prostate cancer have a particular tendency to spread to bones. Lifestyle factors that affect overall cancer risk, such as smoking, obesity, and physical inactivity, may also play a role in disease progression.

Bone metastases are diagnosed through a combination of imaging studies and blood tests. X-rays, bone scans, CT scans, MRI, and PET scans can show areas where cancer has spread to the bones. A biopsy may be done to confirm that abnormal areas are indeed metastases and not another bone condition.

Blood tests play an important role in monitoring bone metastases over time. Rite Aid tests measure alkaline phosphatase and C telopeptide, two biomarkers that reflect bone turnover and damage. Elevated ALP indicates that new bone is forming in response to metastatic cancer. High CTX levels show that bone is breaking down faster than it should. These tests help doctors track disease progression and assess how well treatment is working. You can get tested at over 2,000 Quest Diagnostics locations nationwide with a Rite Aid membership.

• Bisphosphonates to slow bone breakdown and reduce fracture risk
• Denosumab, a medication that blocks bone-destroying cells
• Radiation therapy to shrink tumors and relieve pain
• Chemotherapy or targeted therapy to treat the underlying cancer
• Hormone therapy for hormone-sensitive cancers like breast or prostate cancer
• Pain medications including NSAIDs and opioids for severe pain
• Surgery to stabilize bones at risk of fracture or repair broken bones
• Calcium and vitamin D supplements to support bone health
• Physical therapy to maintain strength and mobility
• Weight-bearing exercise as tolerated to preserve bone density