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Phase I clinical trial of ormaplatin (tetraplatin, NSC 363812).

Ormaplatin is a platinum analog that was developed because of an altered toxicity profile and non-cross resistance to cisplatin in both in vitro and in vivo models. To determine the toxicities and maximum tolerated dose of ormaplatin on a daily times five schedule, patients with refractory solid tumors received ormaplatin on five consecutive days at nine dose levels ranging from 1.0 to 15.0 mg/m2/day. A total of 35 patients received 70 cycles of therapy. Nausea and vomiting and myelosuppression were moderate and not dose-limiting. Dose-limiting neurotoxicity, consisting of a sensory peripheral neuropathy, was seen in all five patients who received cumulative doses greater than or equal to 165 mg/m2. This neurotoxicity was symptomatic in all patients and caused significant functional impairment in four patients with inability to walk in two patients. A sensitive atomic absorption spectroscopy analysis performed for one patient at the 13.0 mg/m2/day dose level showed a Cpmax of 163 ng/ml and a t1/2 of 10.9 min for free platinum. A phase II dose could not be determined due to the onset of peripheral neuropathy at low cumulative doses and not at absolute dose levels.[1]

References

  1. Phase I clinical trial of ormaplatin (tetraplatin, NSC 363812). O'Rourke, T.J., Weiss, G.R., New, P., Burris, H.A., Rodriguez, G., Eckhardt, J., Hardy, J., Kuhn, J.G., Fields, S., Clark, G.M. Anticancer Drugs (1994) [Pubmed]
 
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