**Question:** Drug not used for multiple myeloma is -

A. Corticosteroids
B. Chemotherapy agents (e.g., cyclophosphamide, doxorubicin)
C. Radiotherapy
D. Hormone therapy (e.g., tamoxifen)

**Core Concept:** Multiple myeloma is a plasma cell disorder characterized by the proliferation of monoclonal plasma cells in bone marrow, leading to bone lesions, anemia, and renal insufficiency. Treatment options include chemotherapy, radiotherapy, and hematopoietic stem cell transplantation.

**Why the Correct Answer is Right:** Hormone therapy (e.g., tamoxifen) is primarily used for the treatment of estrogen receptor-positive breast cancer, not multiple myeloma. Multiple myeloma treatment primarily involves chemotherapy agents targeting the plasma cells and their secreted monoclonal proteins. Corticosteroids, such as prednisolone, are commonly used in combination with chemotherapy regimens to reduce plasma cell proliferation and alleviate symptoms.

**Why Each Wrong Option is Incorrect:**

**Option A (Corticosteroids):** Corticosteroids, such as prednisolone, are widely used in combination with chemotherapy regimens to reduce plasma cell proliferation and alleviate symptoms. They are not considered a primary treatment option for multiple myeloma.

**Option B (Chemotherapy agents):** Chemotherapy agents like cyclophosphamide, doxorubicin, and dexamethasone are part of standard treatment for multiple myeloma, such as in the VAD regimen (vincristine, adriamycin, and dexamethasone).

**Option C (Radiotherapy):** Radiotherapy is used for local control of bone pain, spinal cord compression, and pathologic fractures due to skeletal complications in multiple myeloma. However, it is not the primary treatment for the disease itself.

**Option D (Hormone therapy):** Tamoxifen is used for estrogen receptor-positive breast cancer, not multiple myeloma. Chemotherapy agents are primary treatments for multiple myeloma.

**Core Concept:** Multiple myeloma treatment primarily involves chemotherapy agents targeting plasma cells and monoclonal proteins. Corticosteroids are commonly used alongside chemotherapy regimens to alleviate symptoms. Radiotherapy and hormone therapy are not primary treatment options for multiple myeloma.

**Core Concept:** Multiple myeloma is a plasma cell disorder with malignant plasma cells producing monoclonal proteins. These monoclonal proteins can cause bone destruction, renal insufficiency, anemia, and hypercalcemia. Treatment options include chemotherapy agents, radiotherapy, and hematopoietic stem cell transplantation. Hormone therapy (e.g., tamoxifen) is not a primary treatment for multiple myeloma.

**Why Each Wrong Option is Incorrect:**

**Option A (Chemotherapy agents):** Chemotherapy agents like vincristine, adriamycin, and dexamethasone (VAD regimen) are used for multiple myeloma treatment, targeting plasma cells and monoclonal proteins.

**Option B (Chemotherapy agents):** Chemotherapy agents like bortezomib, lenalidomide, and dexamethasone (VRD