Pathology The cell mass in multiple myeloma is formed by- A Circulating B cells settle in BM B Preformed B cells are seen in the marrow C Circulating B cells settle in BM D B-cells turn malignant and secrete light chains 💡 Explanation The cell mass in multiple myeloma is formed by- ✓ Correct Answer: D. B-cells turn malignant and secrete light chains