A Ph1 chromosome-negative chronic myelogenous leukemia (CML) with t(7;11)(p15;p15) in a 6-year-old girl is reported. Three cases of 7;11 translocation have been reported so far. The patients concerned were between 37 and 72 years of age; 2 of them had CML and the other had acute myelomonocytic leukemia. Data from these 4 cases suggest that the 7;11 chromosome translocation may be related to a subgroup of Ph1-negative CML, specifically to one that may easily proceed to blast phase, or to "subacute" myelogenous leukemia. The present case demonstrates that CML with this chromosome abnormality is not restricted to adults but also affects children. The t(1;11)(q21 or 23;p15) reported in another case with Ph1-negative CML may be a variant of this translocation.