Note: Age and gender were available for ten PPCLs and four SPCLs. Clinicohematological and biochemical data were available for eight PPCLs and three SPCLs. SPEP and UPEP data were available for six PPCLs and three SPCLs. Serum protein immunofixation data was available for six PPCLs and two SPCLs.

Abbreviations: PPCL, primary plasma cell leukemia; BM, bone marrow; B2M, beta-2-microglobulin; κ, kappa light chain; λ, lambda light chain; MM, multiple myeloma; PB, peripheral blood; PEP, protein electrophoresis; S. Ca, serum calcium; S. Cr, serum creatinine; TLC, total leukocyte count; NA, not applicable.