In an attempt to develop a new anticancer platinum complex with greater or equivalent antitumor activity but reduced side effects compared with cisplatin (CDDP), a series of new platinum complexes having a glycolate leaving ligand was synthesized. Among them, five complexes were selected for further development on the basis of adequate water solubility, low nephrotoxicity and high antitumor activity in a murine system. The chemosensitivity of these five complexes was examined in MTT assay against two human pulmonary adenocarcinoma cell lines, PC-9 and PC-14, and two human stomach adenocarcinoma cell lines, MKN-45 and KATO III. Their IC50 and relative antitumor activity (RAA) values were compared with those of CDDP and 254-S, a second-generation platinum complex with a glycolate leaving ligand under phase III clinical trial. The lowest mean IC50 value was observed in CDDP, followed by SKI 2034R and SKI 2033R. In this study, the antitumor activity was evaluated in terms of RAA values and SKI 2034R showed the highest RAA value. The order of RAA values was SKI 2034R > CDDP > SKI 2032R > SKI 2033R > SKI 2030R > SKI 2029R > 254-S. Based on the RAA order, we have recommended SKI 2034R as the most promising candidate for further development of a clinically useful platinum complex.

Anticancer research

Pharmacokinetics of a new platinum compound, cis-(glycolato-O,O) [(4R,5R)-4,5-bis(aminomethyl)-1,3-dioxolane-2-spiro-1'-cyclohexane]plat inum (II) in dogs.

Article

Author: Kim, D K ; Kim, T S ; Kim, H T ; Hong, W S ; Cho, Y B ; Kim, K H

A pharmacokinetic study on cis-(glycolato-O,O)/ (4R,5R)-4,5-bis(aminomethyl)-1,3-dioxolane-2-spiro-1'- cyclohexane]platinum(II) (SKI 2032R) was performed in dogs. A single dose of 2.0 mg/kg of SKI 2032R was administered i.v. bolus to three beagle dogs. Plasma samples were analyzed for platinum by flameless atomic absorption spectrophotometry. Plasma concentrations of total and ultrafiltrable platinum for SKI 2032R declined in a biexponential fashion. The mean area under the concentration-time curve (AUC0 --> infinity) determined for ultrafiltrable platinum derived from SKI 2032R, as an active component, was 2.36 +/- 0.23 micrograms. h/ml (mean +/- S.D.), with an initial half-life of 0.23 +/- 0.20 hour, a terminal half-life of 1.32 +/- 0.49 hour, a total clearance of 14.17 +/- 1.50 ml/min/kg, and a steady-state volume of distribution of 1.21 +/- 0.24 l/kg.

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Indication	Highest Phase	Country/Location	Organization	Date
Neoplasms	Preclinical	KR	SK-Pharma, Inc.	-

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