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In these preliminary experiments, we have found enhanced cell killing by the bifunctional alkylating agent L-phenylalanine mustard (L-PAM) in the presence of inhibitors of poly (ADP-ribose) polymerase (ADPRP) in vitro. In vivo enhancement of the tumoricidal effects of L-PAM was observed with the ADPRP inhibitor nicotinamide (1000 mg/kg), although enhanced myelosuppression was also demonstrated. Nicotinamide also increased the plasma elimination half-life of L-PAM by a factor of at least 2. This alteration of L-PAm pharmacokinetics makes it difficult to assess the role that ADPRP inhibition plays in the enhancement of L-PAM tumor cell killing in vivo.
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