1. Temporary remissions in acute leukemia in children produced by folic acid antagonist, 4-aminopteroyl-glutamic acid (aminopterin);Farber;N Engl J Med,1948
2. Effect of methotrexate upon choriocarcinoma and chorioadenoma;Li;Proc Soc Exp Biol Med,1956
3. Howlader N, Noone AM, Krapcho M, Miller D, Brest A, Yu M et al. (eds). SEER Cancer Statistics Review, 1975–2016, National Cancer Institute. Bethesda, MD, https://seer.cancer.gov/csr/1975_2016/, based on November 2018 SEER data submission, posted to the SEER web site, April 2019.
4. Cancer statistics, 2017;Siegel;CA Cancer J Clin,2017
5. Howlader N, Noone AM, Krapcho M, Miller D, Bishop K, Kosary CL et al. (eds.). SEER Cancer Statistics Review 1975-2014. National Cancer Institute, Bethesda, MD. https://seer.cancer.gov/csr/1975_2014/