Analysis of the increase of bone marrow prolymphocytes after complete remission in children with acute lymphoblastic leukemia / 白血病·淋巴瘤

ABSTRACT

Objective To investigate the clinical significance of bone marrow prolymphocytes increasing range from 5 ％ to 15 ％ after complete remission (CR) in children with acute lymphoblastic leukemia provide a prognosis index.Methods The cases of the children with acute lymphoblastic leukemia were analyzed retrospectively.They were divided into three groups,namely A group (N ≤ 5 ％),B group (5 ％ ＜ N ≤ 10 ％),C group (10 ％ ＜ N ≤ 15 ％) according to the bone marrow lymphoblast percentage,and their relapse rates were analysed.Results After the CR,the appearance of bone marrow prolymphocytes slightly increased in children with acute lymphoblastic leukemia accounted for 40.54 ％ (30/74).When the bone marrow prolymphocytes increased to 5 ％＜ N≤ 10 ％,the difference of relapse rates [21.05 ％ (4/19)] had no statistically significant compared with the negative control group [15.91％ (7/44)] (P =0.895),when they increased to 10 ％ ＜ N ≤ 15 ％,the difference of relapse rates [54.54 ％ (6/11)] had statistically significant compared with the negative control group (P =0.014).The difference of incidence rates of this slightly increasing between children' s B-ALL and T-ALL had no statistically significant (P =0.078).Conclusions The bone marrow prolymphocytes increase slightly (5 ％ ＜ N ≤ 10 ％) after CR in children with acute lymphoblastic leukemia might be the normal bone marrow B-lineage lymphocytes' reactive hyperplasia and the prognosis is relatively well.When the bone marrow prolymphocytes increase to 10 ％ ＜ N≤ 15 ％,these prolymphocytes are most likely to be leukemia cells and indicate the possibility of relapse.