Haematologica (May 2013)

The quantitative level of T315I mutated BCR-ABL predicts for major molecular response to second-line nilotinib or dasatinib treatment in patients with chronic myeloid leukemia

  • Thoralf Lange,
  • Thomas Ernst,
  • Franz X. Gruber,
  • Jacqueline Maier,
  • Michael Cross,
  • Martin C. Müller,
  • Dietger Niederwieser,
  • Andreas Hochhaus,
  • Markus Pfirrmann

DOI
https://doi.org/10.3324/haematol.2012.068890
Journal volume & issue
Vol. 98, no. 5

Abstract

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The BCR-ABL T315I mutation causes resistance to imatinib, nilotinib and dasatinib in chronic myeloid leukemia. Forty BCR-ABL positive patients with imatinib resistance were analyzed for T315I mutated clones after six months on nilotinib or dasatinib treatment by quantitative allele-specific ligation polymerase chain reaction with a sensitivity of 0.05%. Ligation polymerase chain reaction revealed 10 patients with more than 10−5 BCR-ABLT315I%/GUS (high levels), none of whom achieved major molecular response after 12 months, and a further 8 patients with 10−5 or below BCR-ABLT315I%/GUS (low levels) who all achieved major molecular response (P