Outcome of patients with retinoblastoma and postlaminar optic nerve invasion.

Abstract

To evaluate the outcome of patients with retinoblastoma and postlaminar optic nerve invasion (PLONI). Retrospective interventional case series. Sixty-one consecutive patients included in 3 successive protocols were analyzed. Pathologic review was done in each case. Patients were stratified into 2 risk groups: the high-risk group included those with concomitant full choroidal and/or scleral invasion and were given adjuvant chemotherapy. Those without these features were considered low risk and chemotherapy was withheld after 1994. Extraocular relapse and survival according to stratification. The probability of event-free survival (pEFS) was 0.91 and the probability of overall survival (pOS) was 0.94 at 5 years. Patients in the high-risk group (n = 22) had pEFS of 0.86. Three had extraocular relapse (involving the central nervous system; all died of disease). Microscopic scleral invasion was associated to extraocular relapse (P = 0.05). Lower risk patients (n = 39) had a pEFS of 0.94 and pOS of 1. Eighteen received postenucleation chemotherapy and none relapsed. Twenty-one received no adjuvant therapy and 2 had a systemic relapse but were successfully retrieved. Relapsing patients had a higher ratio of affected optic nerve (>25% of it overall length; P = 0.02). Patients with PLONI have an excellent outcome with current therapy. Risk stratification according to the presence of concomitant choroidal and/or scleral invasion may help in the decision of giving adjuvant therapy.