Lanzkowsky, P., Shende, A., Aral, I., Saluja, G. (1975). Archives of Disease in Childhood, 50, 685. Organ irradiation and combination chemotherapy in treatment of acute lymphocytic leukaemia in children. A total of 30 consecutive children with acute lymphocytic leukaemia (ALL) were treated from June 1971 until December 1974. Remission was induced with the use of vincristine and prednisone. After induction of remission, cranial irradiation and intrathecal methotrexate were given. Then the liver, spleen, and kidney were irradiated and 6-mercaptopurine, cyclophosphamide, and methotrexate were administered during the maintenance phase. Pulsed doses of vincristine and prednisone were administered at 10- to 12-week intervals. The patients were subdivided into two groups based on their initial white blood cell (WBC) counts: a standard risk group with an initial WBC count of less than 25 000/mm3 (25 X 10(9)/1) and a high risk group with an initial WBC count greater than 25 000/mm3 (25 X 10(9)/1). Of the 30 children entered in this study one standard risk patient died in the induction phase before attaining remission. Analysis of the results is therefore based on the remaining 29 patients, 22 standard risk and 7 high risk patients, who attained complete remission. Survival rates in continuous remission were found to be 43% of the high risk group, 88% for the standard risk group, and 77% for the combined group. Analysis of the data indicates that this therapy is unsatisfactory in high risk ALL. The results to date of this therapy for standard risk are sufficiently encouraging to continue its use in this subgroup of patients.