Early lymphocyte recovery predicts longer survival after autologous peripheral blood stem cell transplantation in multiple myeloma

H Kim, H-J Sohn, S Kim, J-S Lee, W-K Kim, C Suh
Bone Marrow Transplantation 2006, 37 (11): 1037-42
To understand the prognostic value of lymphocyte recovery after autologous peripheral blood stem cell transplantation (APBSCT), we performed a retrospective study of 59 newly diagnosed multiple myeloma (MM) patients who underwent frontline APBSCT. Conditioning regimens were melphalan 100 mg/m(2) for 2 days. Following APBSCT, all patients showed complete or partial response. Median follow-up time was 29.57 months and median recovery of absolute lymphocyte count (ALC) > or =1000/mm(3) was 23 days. Univariate analysis revealed that significant predictors of overall survival (OS) included bone marrow (BM) plasma cells < or =40% at diagnosis (P=0.0243) and recovery of ALC > or =1000/mm(3) by day +23 (P=0.0156). Positive predictors for progression-free survival (PFS) were BM plasma cells < or =40% at diagnosis (P=0.0134) and recovery of ALC > or =1000/mm(3) by day +23 (P=0.0243). Absolute neutrophil count > or =1000/mm(3) on day +12 was marginally significant for OS and PFS (P=0.0821 and P=0.1153, respectively). Multivariate analysis showed that ALC > or =1000/mm(3) on day +23 independently predicted OS (P=0.031) and prolonged PFS (P=0.011), and that serum beta2-microglobulin was marginally significant for prolonged OS (P=0.066). In conclusion, ALC recovery was an independent predictor of both OS and PFS in MM.

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