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Abstract

Agents against drug-resistant tumor cells comprising a 1,4-dihydropyridine derivative represented by the following formula (I): ##STR1## wherein R.sup.1 is an aryl group which may be substituted; R.sup.2 and R.sup.3, which may be the same or different, each is a member selected from the group consisting of an alkyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, an aralkyloxycarbonyl group, an aminocarbonyl group, a hydroxycarbonyl group, a formyl group, and a cyano group, each of which may be substituted; R.sup.4 and R.sup.5 is a hydrogen atom or a member selected from the group consisting of a lower alkyl group, a hydroxymethyl group, a cyano group, an amino group, a formyl group, and a halogen atom; and R.sup.6 is a member selected from the group consisting of an alkyl group, an aralkyl group, an alkoxycarbonyl group and an aralkyloxycarbonyl group, each of which may be substituted and the alkyl moiety in each may also contain a double bond, a triple bond or a hetero atom and combinations thereof with anti-cancer agents.

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First Claim