Patients with a histologic diagnosis of small noncleaved cell (undifferentiated) (SNCL), lymphoblastic (LL), and large cell lymphoma (LCL) who were treated according to National Cancer Institute Pediatric Branch non-Hodgkin's lymphoma protocols 74-0, 75-6, 76-5, 77-04, 85-C-67, and 89-C-41A, and who have been in continuous remission for one year or longer following completion of treatment.