EPO and systemic lupus erythematosus: Secondary acquired causes include infections (bacterial or viral), drugs (such as erythropoietin and carbamazepine), collagen vascular disorders (such as systemic lupus erythematosus (SLE) and rheumatoid arthritis), solid tumors (such as thymoma), post-ABO-incompatible stem cell transplant, and various other hematologic conditions [5,6].