A monoclonal gammopathy curve on electrophoresis most strongly suggests which disease?

• A. Multiple Myeloma
• B. Hypogammaglobulinemia
• C. Juvenile Cirrhosis
• D. Pulmonary Emphysema

Answer: (A)

A monoclonal gammopathy on electrophoresis reflects a single clone of plasma cells producing one type of immunoglobulin, which appears as a sharp, narrow M-spike in the gamma (or sometimes the beta) region. This pattern is most strongly associated with a plasma cell neoplasm, particularly multiple myeloma, where malignant cells overproduce a uniform immunoglobulin (often IgG or IgA) or light chains. The presence of an M-spike helps distinguish this from polyclonal gammopathy (seen in chronic inflammation) and from conditions without clonal immunoglobulin overproduction. The other listed conditions do not produce a discrete monoclonal spike: hypogammaglobulinemia involves reduced overall immunoglobulins, and juvenile cirrhosis and pulmonary emphysema are not characterized by monoclonal immunoglobulin overproduction. Hence, multiple myeloma is the best-supported interpretation of a monoclonal gammopathy on SPEP.