Methods: We present a case of a 61-year-old woman presenting with T-PLL and the leukemic cells harboring BCR::ABL1 (BCR—breakpoint cluster region; ABL1—ABL protooncogene 1) fusion transcripts as the result of a variant of t(9;22)(q34;q11) called Philadelphia translocation: t(9;22;18)(q34;q11;q21). This evidence concerns the gene ABL1 and prolymphocytic leukemia.