1. Ward E, Desantis C, Robbins A, et al: Childhood and adolescent cancerstatistics, 2014. CA Cancer J Clin [epub ahead of print on January 31, 2014]
2. Djerassi I, Farber S, Abir E, et al: Continuous infusion of methotrexate inchildren with acute leukemia. Cancer 20:233–242, 1967
3. Skipper HE, Thomson JR, Elion GB, et al: Observations on the anticanceractivity of 6‑mercaptopurine. Cancer Res 14:294–298, 1954
4. Goldman ID: A model system for the study of heteroexchange diffusion: Methotrexate-folate interactions in L1210 leukemia and Ehrlich ascites tumorcells. BiochimBiophysActa 233:624–634, 1971
5. Shackney SE: A computer model for tumor growth and chemotherapy, and its application to L1210 leukemia treated with cytosine arabinoside (NSC-63878). Cancer Chemother Rep 54:399–429, 1970