A Prospective Study of a Long‐term Follow‐up of an Observation Program for Neuroblastoma Detected by Mass Screening

A nationwide mass screening for neuroblastoma (NBL) in 6‐month‐old infants (MS6M) was performed in Japan from 1985 to 2003. Favorable biological features were identified for most of the detected tumors; consequently, we began an observation program for selected screened patients in 1993. Here, we report the clinicopathological findings and present status of patients enrolled in our observation program, with the goal of evaluating its usefulness.