Deletions of the p27 gene have only been detected in B-immunoblastic non-Hodgkin's lymphomas and adult T-cell leukaemias/lymphomas (Morosetti et al, 1995); (2) There may be a quantitative or structural abnormality of the cyclin E/cdk2 complex. This evidence concerns the gene CDK2 and adult T-cell leukemia/lymphoma.