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"7+3" in the context of chemotherapy is an acronym for a chemotherapy regimen that is most often used today as first-line induction therapy in acute myelogenous leukemia, excluding the acute promyelocytic leukemia form, which is better treated with ATRA and/or arsenic trioxide and requires less chemotherapy.

The name "7+3" comes from the duration of chemotherapy course, which consists of 7 days of standard-dose cytarabine, and 3 days of an anthracycline antibiotic or an anthracenedione, most often daunorubicin.

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