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Shigematsu, A.1; Ota, S.2; Kobayashi, R.3; Kondo, T.4; Endo, T.5; Tsutsumi, Y.6; Kobayashi, H.7; Kakinoki, Y.8; Yamamoto, S.9; Konuma, Y.10; Miyagishima, T.11; Igarashi, T.12; Oda, T.13; Sakai, H.14; Ishihara, T.15; Yoshida, M.16; Nagashima, T.17; Sato, K.18; Kanisawa, Y.19; Haseyama, T.20; Hirayama, Y.21; Kurosawa, M.22

doi: 10.1097/01.HS9.0000558952.18518.ed
Poster Session I: Acute lymphoblastic leukemia - Clinical

1Department of Hematology, Sappro Hokuyu Hospital

2Department of Hematology, Sapporo Hokuyu Hospital

3Department of Pediatrics, Sappro Hokuyu Hospital

4Blood Disorders Center, Department of Hematology, Aiiku Hospital

5Department of Hematology, Hokkaido University School of Medicine, Sapporo

6Department of Hematology, Hakodate Municipal Hospital, Hakodate

7Department of Hematology, Obihiro Kosei Hospital, Obihiro

8Department of Hematology, Asahikawa City Hospital, Asahikawa

9Department of Hematology, Sapporo City General Hospital, Sapporo

10Department of Hematology/Oncology, Asahikawa Red Cross Hospital, Asahikawa

11Department of Hematology, Kushiro Rosai Hospital, Kushiro

12Department of Hematology, Tenshi Hospital

13Department of Hematology/Oncology, Hokkaido Medical Center for Child Health and Rehabilitation

14Department of Hematology, Teine Keijinkai Hospital

15Department of Hematology, Kin-ikyo Chuo Hospital, Sapporo

16Department of Hematology/Oncology, Steel Memorial Muroran Hospital, Muroran

17Department of Internal medicine, Japanese Red Cross Kitami Hospital, Kitami

18Department of Hematology/Oncology, Asahikawa Kosei Hospital, Asahikawa

19Department of Hematology/Oncology, Oji General Hospital, Tomakomai

20Department of Hematology, Tonan Hospital

21Department of Internal Medicine, Higashi Sapporo Hospital

22Department of Hematology, National Hospital Organization, Hokkaido Cancer Center, Sapporo, Japan

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Complete remission (CR) has been induced by multiagent remission induction therapies in the majority of patients with acute lymphoblastic leukemia (ALL). However, prognosis for adult patients with ALL has not been satisfactory due to a high rate of relapse, and the feasibility of post-remission consolidation therapy has been reported. Most treatment protocols include post-remission consolidation chemotherapy, however, it remains to be clarified whether consolidation is beneficial especially in patients who is considered to receive allogeneic hematopoietic stem cell transplantation (allo-HCT).

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We retrospectively analyzed importance of consolidation chemotherapy in patients with ALL.

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Clinical data for 312 patients aged more than 15 years who diagnosed as having ALL between 2007 and 2017 were collected from 21 centers in Hokkaido, Japan. Patients with lymphoblastic lymphoma and Burkitt leukemia, and patients who did not achieve CR by first induction remission chemotherapy were excluded from this study.

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The median age of the patients was 55 years (range: 15-84 years). Sixty-three patients were AYA (15-35 years), 163 were adult (36-65 years) and 86 were elderly patients (66- years). BCR-ABL was positive in 158 patients. After a first remission induction therapy, 192 of 216 evaluable patients achieved cytogenetic CR, and 74 of 121 evaluable patients achieved molecular CR.

Consolidation chemotherapies were administered for 264 of the patients. In the 49 patients who did not receive consolidation, 37 patients were BCR-ABL positive and 12 patients were BCR-ABL negative. Older age, poor performance status and BCR-ABL positivity were associated with not receiving consolidation.

At the median follow-up of 1092 days (54-3914 days), overall survival (OS) and progression-free survival (PFS) were significantly superior in patients who received at least one course of consolidation therapy (P < 0.001, Figure). However, in the patients with BCR-ABL who received tyrosine kinase inhibitor (TKI) as maintenance therapy, consolidation chemotherapy was not associated with OS (P = 0.19). Among the patients who did not receive allo-HCT at CR1, larger number of consolidation chemotherapy was associated with superior survival. Among patients who received allo-HCT at CR1, the number of consolidation chemotherapy was not associated with OS (P = 0.825).



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Consolidation chemotherapy was associated with better survival in patients with ALL. However, in patients with BCR-ABL or in patients considered allo-SCT, consolidation chemotherapy was not associated with better survival. We need to consider maintenance TKI therapy without consolidation for BCR-ABL positive patients and early allo-SCT for candidates of transplantation.

Copyright © 2019 The Authors. Published by Wolters Kluwer Health Inc., on behalf of the European Hematology Association.