Published in:
01-10-2010 | Original Article
Clinical significance of minimal residual disease in adult acute lymphoblastic leukemia
Authors:
Misato Kikuchi, Junji Tanaka, Takeshi Kondo, Satoshi Hashino, Masaharu Kasai, Mitsutoshi Kurosawa, Hiroshi Iwasaki, Masanobu Morioka, Tsugumichi Kawamura, Nobuo Masauzi, Takashi Fukuhara, Yasutaka Kakinoki, Hajime Kobayashi, Satoshi Noto, Masahiro Asaka, Masahiro Imamura
Published in:
International Journal of Hematology
|
Issue 3/2010
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Abstract
Monitoring minimal residual disease (MRD) in patients with acute lymphoblastic leukemia (ALL) is a useful way for assessing treatment response and relapse. We studied the value of MRD and showed a correlation with relapse for 34 adult patients with ALL. MRD was evaluated by real-time quantitative polymerase chain reaction (RQ-PCR) with probes derived from fusion chimeric genes (BCR/ABL) (n = 12) or PCR-based detection of clonal immunoglobulin and T cell receptor gene rearrangements (n = 16), or both (n = 6). We analyzed 27 of the 34 patients who could be examined for MRD on day 100 after induction therapy. The overall survival (OS) rate (45.0%) and relapse-free survival (RFS) rate (40.0%) at 2 years in complete remission (CR) patients with MRD level ≥10−3 (n = 12) were significantly lower than those in CR patients with MRD level <10−3 (n = 15) (OS rate 79.0%, RFS rate 79.4%) (log-rank test, P = 0.017 and 0.0007). We also applied multicolor flow cytometry for comparison with MRD results analyzed by PCR methods. The comparison of results obtained in 27 follow-up samples showed consistency in 17 samples (63.0%) (P = 0.057). MRD analysis on day 100 is important for treatment decision in adult ALL.