- Phase I and pharmacokinetic trial of intraperitoneal etoposide in combination with the multidrug-resistance-modulating agent dipyridamole. Isonishi, S., Kirmani, S., Kim, S., Plaxe, S.C., Braly, P.S., McClay, E.F., Howell, S.B. J. Natl. Cancer Inst. (1991)