THE NEED TO SCREEN ALL RETINOBLASTOMA PATIENTS FOR ESTERASE-D ACTIVITY - DETECTION OF SUBMICROSCOPIC CHROMOSOME DELETIONS

Roughly 5% of all patients with retinoblastoma carry a constitutional chromosome deletion in the long arm of chromosome 13, which confers a prezygotic predisposition to tumor development. As offspring of deletion carriers have a 50% risk of inheriting the predisposition locus it is important to identify deletion carriers. The site of the esterase D gene to the often deleted region offers an objective means of deletion identification. The chromosomes of a patient with unilateral retinoblastoma, previously supposed to have a normal karyotype, were reexamined after the discovery that his red blood cells contained reduced activities of esterase D. A small sub-band deletion was found in chromosome region 13q14. These findings emphasize the importance of measurements of esterase D in all patients with retinoblastoma, even those with an apparently normal karyotype.