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Key Clinical Message  We report here the clinical course of a Ph+ ALL patient who was treated with ponatinib 15 mg/day, as maintenance therapy, and developed a BCR‐ABL T315I mutation leading to ALL relapse. This clonal evolution was reversed, without adverse effects, by increasing ponatinib to 45 mg/day. To our knowledge, we have been confronted with the first clinical case of a T315I clonal selection of ALL caused by subeffective therapeutic level of the drug. This single patient experience highlights the risk of T315I clone selection in Ph+ ALL treated with reduced dose ponatinib.

T315I clone selection in a Ph+ all patient under low‐dose ponatinib maintenance