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The International Scale for quantitative reverse transcriptase polymerase chain reaction analysis of BCR-ABL1 transcripts. IRIS: International Randomized Study of Interferon and STI571; MMR: major molecular response; MR4, MR4.5 and MR5: 4-, 4.5- and 5-log reductions, respectively, from the IRIS standardized baseline; Ph: Philadelphia chromosome; RT-qPCR: quantitative reverse transcriptase polymerase chain reaction.
