Chromosome banding studies carried out on bone marrow cells from a 16
year-old boy with an M1 acute nonlymphocytic leukemia (ANLL) revealed
an unbalanced translocation involving chromosomes 1 and 10: der(10) t(
1;10) (q21;q26) that results in a partial trisomy 1q between bands 1q2
1-1qter. Marker del(6)(q21) and trisomies of chromosomes 18, 21 and 22
were also observed. To our knowledge, this der(10) is the first to be
reported in a patient with ANLL.