[CD20 Expression in Adult Patients with B-lineage Acute Lymphoblastic Leukemia and Its Prognostic Significance].

Objective: To explore the relationship between the expression of CD20 antigen and clinical characteristics in adult patients with B-acute lymphoblastic leukemia(B-ALL).

Methods: The CD20 expression of 126 acute lympho-blastic leukemia patients in our hospital from July 2009 to July 2012 were determined by flow cytometry. The characteristics, examination results and outcome were analyzed retrospectively. The complete remission rate (CR rate), relape rate, 2-year survival rate and 2-year event-free survival (EFS) of patients with CD20 positive and negative after the first cycle of chemstherapy were compared.

Results: Positive rate of CD20 antigen expression in 126 patients was 24.4% (31 cases), negative rate of CD20 antigen expression in 126 patients was 75.6% (95 cases). No significant relationship was found between CD20 antigen expression and sex, age, peripheral blood leucocytes count and chromosomal changes. The relapse rate, 2-year survival rate (OS) and 2-year event-free survival (EFS) of adult patients with B-ALL in CD20 positive and negative groups were 53.3% and 38.0%, 52.1% and 92.3%, 33.7% and 70.8% respectively.

Conclusion: Expression of CD20 in adult patients with B-ALL did not related with clinical features, but related with poor prognosis.