A 28-year-old man is diagnosed with B-cell acute lymphoblastic leukemia. Cytogenetic analysis reveals t(9;22)(q34;q11.2) resulting in a p190 BCR-ABL1 transcript. Which statement best characterizes the significance of this finding?
- A It confers a favorable prognosis equivalent to hyperdiploidy in childhood ALL
- B It defines the highest-risk cytogenetic subgroup in adult ALL, historically cured in fewer than half of patients even before TKI-based regimens improved outcomes ✓
- C It establishes transformation of chronic myeloid leukemia into lymphoid blast crisis
- D It indicates a mature B-cell phenotype requiring surface immunoglobulin expression
Correct answer: B. It defines the highest-risk cytogenetic subgroup in adult ALL, historically cured in fewer than half of patients even before TKI-based regimens improved outcomes
Explanation
Philadelphia chromosome-positive ALL is the classic adverse-risk genotype in adult ALL, carrying a poor historical prognosis, though addition of tyrosine kinase inhibitors has substantially improved remission rates. Hyperdiploidy is favorable in childhood ALL, so option A is wrong. Without prior documented CML, this represents de novo Ph-positive ALL rather than blast crisis, and Ph-positive ALL remains a precursor A-cell neoplasm that is usually surface immunoglobulin negative.
Reference: Robbins and Cotran Pathologic Basis of Disease, 10th ed.
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