Which class of drugs is used to protect bones and treat bone metastases in breast cancer?

Which class of drugs is used to protect bones and treat bone metastases in breast cancer?

• A. Bisphosphonates
• B. NSAIDs
• C. Antihistamines
• D. Antidepressants

Answer: (A)

Osteoclast suppression is the key idea here. Bisphosphonates are antiresorptive drugs that bind to bone minerals and are taken up by osteoclasts during bone resorption. Once inside the osteoclasts, they disrupt critical intracellular pathways—specifically the mevalonate pathway—leading to impaired formation and function and promoting osteoclast apoptosis. This slows bone turnover, helps stabilize the bone matrix, and reduces the risk of fractures and other skeletal-related events in patients with bone metastases from breast cancer. They also help manage cancer-related hypercalcemia and can relieve bone pain. In clinical practice, these agents are commonly given intravenously (for example, zoledronic acid or pamidronate) and sometimes orally, with careful monitoring of kidney function and calcium levels. Dental evaluation and good oral hygiene are important because of the risk of osteonecrosis of the jaw. Common side effects include hypocalcemia, renal toxicity, flu-like symptoms after infusion, and jaw-related complications in some patients. Other options listed—NSAIDs, antihistamines, and antidepressants—address symptoms or unrelated conditions and do not protect bone or treat bone metastases in breast cancer.

Osteoclast suppression is the key idea here. Bisphosphonates are antiresorptive drugs that bind to bone minerals and are taken up by osteoclasts during bone resorption. Once inside the osteoclasts, they disrupt critical intracellular pathways—specifically the mevalonate pathway—leading to impaired formation and function and promoting osteoclast apoptosis. This slows bone turnover, helps stabilize the bone matrix, and reduces the risk of fractures and other skeletal-related events in patients with bone metastases from breast cancer. They also help manage cancer-related hypercalcemia and can relieve bone pain.

In clinical practice, these agents are commonly given intravenously (for example, zoledronic acid or pamidronate) and sometimes orally, with careful monitoring of kidney function and calcium levels. Dental evaluation and good oral hygiene are important because of the risk of osteonecrosis of the jaw. Common side effects include hypocalcemia, renal toxicity, flu-like symptoms after infusion, and jaw-related complications in some patients.

Other options listed—NSAIDs, antihistamines, and antidepressants—address symptoms or unrelated conditions and do not protect bone or treat bone metastases in breast cancer.