- Phase II study of weekly edatrexate as first-line chemotherapy for metastatic breast cancer: a National Cancer Institute of Canada Clinical Trials Group study. Vandenberg, T.A., Pritchard, K.I., Eisenhauer, E.A., Trudeau, M.E., Norris, B.D., Lopez, P., Verma, S.S., Buckman, R.A., Muldal, A. J. Clin. Oncol. (1993)