Specificity of the 5q-chromosome in a distinct type of refractory anemia.

A further instance of the 5q-chromosome associated with a distinct type of aregenerative anemia strengthened the hypothesis of specificity and consistency of this karyotypic abnormality in a new hematologic entity. The Giemsa banding technique revealed that the deletion of the long arms of chromosome number 5 was interstitial: del (5) (pter leads to q12 : : q31 leads to qter).