TY - JOUR T1 - Molecular response to imatinib mesylate of Brazilian patients with chronic myeloid leukemia JO - Hematology, Transfusion and Cell Therapy T2 - AU - Vieira-Mion,Ana Lucia AU - Pereira,Noemi Farah AU - Funke,Vaneuza Araujo Moreira AU - Pasquini,Ricardo SN - 15168484 M3 - 10.1016/j.bjhh.2017.04.007 DO - 10.1016/j.bjhh.2017.04.007 UR - http://www.htct.com.br/pt-molecular-response-imatinib-mesylate-brazilian-articulo-S1516848417300695 AB - BackgroundImatinib mesylate has revolutionized the treatment of chronic myeloid leukemia leading to significant reductions of BCR-ABL1 transcript levels in peripheral blood. ObjectiveTo evaluate the response to imatinib mesylate treatment (400mg/day) in Brazilian patients in the chronic phase of chronic myeloid leukemia monitored by quantitative real time polymerase chain reaction. MethodsBetween October 2002 and October 2010, 3169 peripheral blood samples were collected from 1403 patients from 3 to 5 months, 6 to 11 months, 12 to 17 months, 18 to 23 months and ≥24 months after beginning imatinib treatment. Eighty-two patients had samples available and analyzed for all time intervals. BCR-ABL1 quantification was performed by quantitative real time polymerase chain reaction using the ABL1 gene as the control. Results of the BCR-ABL1 ratio as a percentage were reported by the international scale (IS) using the laboratory conversion factor (0.51). ResultsIn the first interval, 80.8% of patients achieved the optimal response (BCR-ABL1IS≤10%). In the second period, 69.1% achieved optimal response (BCR-ABL1IS≤1%) and, between 12 and 17 months, 47.3% achieved major molecular response (BCR-ABL1IS≤0.1%). ConclusionsThe results of this retrospective study show that the response to imatinib treatment (400mg/day) of Brazilian patients in the chronic phase of chronic myeloid leukemia is within the expected profile when compared to patients reported in international prospective randomized studies. ER -