With future identification of effective chemotherapy new studies may be focused upon patients with localized disease to reduce radiation dosage or the need for immediate resection of all involved eys. In metastic retinoblastoma, chemotherapy seems ethical, however the toxicity and response rates can be monitored. Collaborative studies multicentre rials may be necessary.

There are different classification to retinoblastoma:

Reese Ellsworth, CCSG childrem Cancer Study Group, St. Jude's Research Hospital and others. to the Pediatric Depatment in A. C. Camargo, Säo Paulo, Brazil, are referred patients which more than a half percent are extra ocular tumors and 80% of uni or bilateral tumors are in group V at the time of diagnosis. Since December, 1987, we have been in a Cooperative Group to Treatment of retinoblastoma in Brazil that lists in table 1 and 2 classification most widely used to retinoblastoma intra and extra ocular respectively