Autoimmune hemolytic anemia is associated with malignancy of which lineage –
**Core Concept**
Autoimmune hemolytic anemia (AIHA) is a condition where the immune system produces antibodies against the red blood cells, marking them for destruction. In some cases, AIHA is associated with underlying malignancies that stimulate the immune system to produce these autoantibodies.
**Why the Correct Answer is Right**
The correct association is with lymphoproliferative disorders, particularly those of B-cell lineage. This is because B cells are responsible for producing antibodies, and malignancies of B cells can lead to the production of autoantibodies against red blood cells. In AIHA associated with malignancy, the B cells are often clonally expanded, producing large quantities of autoantibodies against red blood cell antigens.
**Why Each Wrong Option is Incorrect**
**Option A:** T-cell lineage malignancies are not typically associated with AIHA. While T cells can play a role in immune surveillance and modulation, B cells are primarily responsible for antibody production in AIHA.
**Option B:** Myeloproliferative disorders, such as polycythemia vera or essential thrombocytopenia, are not typically associated with AIHA. These disorders are characterized by the clonal expansion of myeloid cells, which do not produce antibodies.
**Option C:** Solid tumors, such as lung or breast cancer, are not typically associated with AIHA. While solid tumors can stimulate an immune response, they are not typically associated with the production of autoantibodies against red blood cells.
**Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is that AIHA is more common in older adults and can be associated with a variety of underlying conditions, including lymphoproliferative disorders, chronic infections, and autoimmune diseases.
**Correct Answer:** C.