Comparison between patients with Philadelphia-positive chronic phase chronic myeloid leukemia who obtained a complete cytogenetic response within 1 year of imatinib therapy and those who achieved such a response after 12 months of treatment

Ilaria Iacobucci, Gianantonio Rosti, Marilina Amabile, Angela Poerio, Simona Soverini, Daniela Cilloni, Nicoletta Testoni, Elisabetta Abruzzese, Enrico Montefusco, Emanuela Ottaviani, Francesco Iuliano, Domenico Russo, Marco Gobbi, Giuliana Alimena, Bruno Martino, Carolina Terragna, Fabrizio Pane, Giuseppe Saglio, Michele Baccarani, Giovanni Martinelli

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: Imatinib mesylate is a potent inhibitor of BCR-ABL, the constitutively active tyrosine kinase protein critical for the pathogenesis of chronic myeloid leukemia. Patients and Methods: We reviewed 284 patients with late chronic-phase Philadelphia chromosome (Ph) -positive chronic myeloid leukemia treated with imatinib 400 mg daily after interferon-α failure. In a retrospective study, we evaluated the pattern and rapidity of the response to imatinib, comparing the cytogenetic and molecular responses, progression-free and overall survival rates in patients who obtained a complete cytogenetic response within 1 year of treatment (early responders), and in patients where a complete cytogenetic response was detected after 12 months (late responders). Results: After 3 or 4 years of treatment, the molecular response of the late cytogenetic responders was similar to that of the early cytogenetic responders. At 36 months of treatment the amount of residual disease measured by standardized quantitative reverse-transcriptase polymerase chain reaction was 0.00047 in late responders versus 0.00022 in early responders, and at 48 months it was 0.00019 versus 0.00026 (median values, P value = nonsignificant). The estimated 4-year progression-free survival rate was 88% for early responders and 100% for late responders, while the estimated 4-year overall survival rates were 92% and 100% for early and late responders, respectively. Conclusion: The sensitivity and the response (cytogenic and molecular) to imatinib may require 1 year or more. Long-term follow-up results continue to improve in terms of rates and durability of the complete cytogenetic response, major or complete molecular response, and progession-free and overall survival.

Original languageEnglish
Pages (from-to)454-459
Number of pages6
JournalJournal of Clinical Oncology
Volume24
Issue number3
DOIs
Publication statusPublished - Jan 20 2006

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Fingerprint Dive into the research topics of 'Comparison between patients with Philadelphia-positive chronic phase chronic myeloid leukemia who obtained a complete cytogenetic response within 1 year of imatinib therapy and those who achieved such a response after 12 months of treatment'. Together they form a unique fingerprint.

Cite this