- Phase II studies of single-agent cimetidine and the combination N-phosphonacetyl-L-aspartate (NSC-224131) plus L-alanosine (NSC-153353) in advanced malignant melanoma. Morton, R.F., Creagan, E.T., Cullinan, S.A., Mailliard, J.A., Ebbert, L., Veeder, M.H., Chang, M. J. Clin. Oncol. (1987)