A 6-year-old girl is diagnosed with B-cell acute lymphoblastic leukemia (B-ALL) on bone marrow biopsy. Cytochemistry shows strong periodic acid–Schiff (PAS) positivity. Immunophenotyping confirms CD19+, CD10+, and TdT+ blasts. No CNS involvement is detected on lumbar puncture. What is the drug of choice for induction therapy in this patient?

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