Patterns of imatinib resistance mutation analysis in chronic myeloid leukemia (CML) patients on imatinib at the time of loss of response to the drug in Asian Indian subjects
Abstract:7079 Background: The treatment of (CML) has undergone major changes in the past decade with the introduction of tyrosine kinase inhibitors (TKI). However the initial enthusiasm is waning with increasing recognition of drug resistance. There is an urgent need to identify the types of receptor mutations which lead to drug resistance and their significance in salvage therapy. Methods: We identified 17 males and 8 female patients with median age 40 yrs (range 9–55 years) with CML who were on imatinib at the time … Show more
“…Only 27 patients (27%) had mutation detected, M351T, T315I being most common in 4 patients each and F359I in 3 patients. Prakash et al [14] reported analysis of mutations in 25 patients with CML on Imatinib at the lime of loss of response to the drug in Asian-Indian patients. Twenty-two patients were in chronic phase and median age was 40 years.…”
Section: Discussionmentioning
confidence: 99%
“…Kinase domain mutations were evaluated using the fluorescent nucleotide sequencing technique followed by bioinformatics tool, multiple nucleotide sequencing alignment. Indications of mutation analysis were based on recent European LeukemiaNet guidelines [14]. Loss of hematological response (HR), cytogenetic response (CyR) or molecular response or delay in attaining defined landmarks were indications for asking imatinib resistance mutation analysis.…”
Section: Methodsmentioning
confidence: 99%
“…Loss of hematological response (HR), cytogenetic response (CyR) or molecular response or delay in attaining defined landmarks were indications for asking imatinib resistance mutation analysis. Hematological response, cytogenetic and molecular responses at different time points were defined as per ELN 2013 guidelines for chronic myeloid leukemia [14]. Poor response was defined as not achieving hematological, cytogenetic or molecular response at defined time points by ELN.…”
Tyrosine kinase inhibitors (TKI's) are currently the drug of choice for management of chronic myeloid leukemia. Imatinib is the most commonly used first line TKI in India. Mutations leading to resistance to imatinib are the most common cause for imatinib failure. We studied pattern of kinase domain mutations in 40 patients of CML who either lost their response or did not achieve it in defined timepoints. Loss of molecular response was the most common indication for asking mutation analysis. Sixteen patients were found to have detectable mutations. M351T was the most common tyrosine kinase mutation followed by Y253H and H396R. Two patients had 2 mutations simultaneously. M351T is the most common mutation in our patient population.
“…Only 27 patients (27%) had mutation detected, M351T, T315I being most common in 4 patients each and F359I in 3 patients. Prakash et al [14] reported analysis of mutations in 25 patients with CML on Imatinib at the lime of loss of response to the drug in Asian-Indian patients. Twenty-two patients were in chronic phase and median age was 40 years.…”
Section: Discussionmentioning
confidence: 99%
“…Kinase domain mutations were evaluated using the fluorescent nucleotide sequencing technique followed by bioinformatics tool, multiple nucleotide sequencing alignment. Indications of mutation analysis were based on recent European LeukemiaNet guidelines [14]. Loss of hematological response (HR), cytogenetic response (CyR) or molecular response or delay in attaining defined landmarks were indications for asking imatinib resistance mutation analysis.…”
Section: Methodsmentioning
confidence: 99%
“…Loss of hematological response (HR), cytogenetic response (CyR) or molecular response or delay in attaining defined landmarks were indications for asking imatinib resistance mutation analysis. Hematological response, cytogenetic and molecular responses at different time points were defined as per ELN 2013 guidelines for chronic myeloid leukemia [14]. Poor response was defined as not achieving hematological, cytogenetic or molecular response at defined time points by ELN.…”
Tyrosine kinase inhibitors (TKI's) are currently the drug of choice for management of chronic myeloid leukemia. Imatinib is the most commonly used first line TKI in India. Mutations leading to resistance to imatinib are the most common cause for imatinib failure. We studied pattern of kinase domain mutations in 40 patients of CML who either lost their response or did not achieve it in defined timepoints. Loss of molecular response was the most common indication for asking mutation analysis. Sixteen patients were found to have detectable mutations. M351T was the most common tyrosine kinase mutation followed by Y253H and H396R. Two patients had 2 mutations simultaneously. M351T is the most common mutation in our patient population.
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