[Clinical features and prognosis in CD10(-) pre-B acute lymphoblastic leukemia]

Objective: To analyze the clinical features and prognosis of acute lymphoblastic leukemia patients with immunophenotype of CD10(-)pre-B (CD10(-) pre B-ALL) . Methods: 6 adult cases with CD10(-) pre B-ALL immunophenotypes were analyzed retrospectively, related literatures were reviewed to clarify these kind of patients' clinical features and prognosis. Results: CD10(-) pre B-ALL occurred in 1.5% of ALL, 1.8% of B-ALL and 11.5% of pre B-ALL respectively. All the 6 patients were male with the median age as 33.5 years old, the median white blood cells was 101.78×10(9)/L, MLL-AF4 fusion transcripts were evident in all cases. Complete remission (CR) was achieved in 5 patients after first induction chemotherapy, 1 patient failed to respond to induction therapy, and got CR after 3 courses of chemotherapy. 2 patients underwent allogeneic hematopoietic stem cell transplantation (allo-HSCT) in CR(1), 1 patient relapsed in the short term and underwent allo-HSCT in CR(2). 1 patient was still waiting for allo-HSCT. Of the 2 patients who didn't receive transplantation, 1 died following a relapse, the other remained to be in CR. Conclusions: CD10(-) pre B-ALL was a rare but distinct subtype in adult ALL characterized by male dominance, high onset white blood cells and MLL rearrangement rate. Conventional chemotherapy produced a high response rate but more likely relapse, allo-HSCT may have the potential to improve the prognosis of these patients.