TRANSLOCATION (2-14)(P13-Q32) IN CD10-LEUKEMIA(CD13+ACUTE LYMPHATIC)

The rare t(2;14)(p13;q32) was previously described in three pediatric patients with acute lymphatic leukemia. In these cases this abnormalit y was found at diagnosis, manifested the sole chromosomal abnormality, and was associated with a favorable prognosis. We here describe three cases of leukemia where such translocations were found at relapse, we re associated in two of the cases with additional known characteristic chromosomal aberration, and were associated with a grave prognosis. I nterestingly enough, the malignant cells of all three patients shared the same surface antigens: CD34, HLA DR, CD10, CD20, and the myeloid m arker CD13. The leukemic clone exhibiting t(2;14) probably evolved fro m a t(1;19)6q- pre-B acute lymphatic leukemia in one of the cases, and from a chronic phase Ph1 chromosome in another. The significance of t he translocation and the coexistence of CD10 and CD13 on the same cell are discussed.