Patent ID: 6930115

Claim:
A pharmaceutical composition comprising an antitumor agent and an antitumor effect potentiator comprising a compound having a Rho kinase inhibitory activity as an active ingredient, which reinforces an antitumor effect of the antitumor agent, wherein the compound is an amide compound of the following formula (I) wherein Ra is a group of the formula in the formulas (a) and (b), R is hydrogen, alkyl, or cycloalkyl, cycloalkylalkyl, phenyl or aralkyl, which optionally has a substituent on the ring, or a group of the formula wherein R 6 is hydrogen, alkyl or formula: —NR 8 R 9 wherein R 8 and R 9 are the same or different and each is hydrogen, alkyl, aralkyl or phenyl, R 7 is hydrogen, alkyl, aralkyl, phenyl, nitro or cyano, or R 6 and R 7 in combination show a group forming a heterocycle optionally further having, in the ring, oxygen atom, sulfur atom or optionally substituted nitrogen atom, R 1 is hydrogen, alkyl, or cycloalkyl, cycloalkylalkyl, phenyl or aralkyl, which optionally has a substituent on the ring, or R and R 1 in combination form, together with the adjacent nitrogen atom, a group forming a heterocycle optionally further having, in the ring, oxygen atom, sulfur atom or optionally substituted nitrogen atom, R 2 is hydrogen or alkyl, R 3 and R 4 are the same or different and each is hydrogen, alkyl, aralkyl, halogen, nitro, amino, alkylamino, acylamino, hydroxy, alkoxy, aralkyloxy, cyano, acyl, mercapto, alkylthio, aralkylthio, carboxy, alkoxycarbonyl, carbamoyl, mono- or dialkylcarbamoyl or azide, and A is a group of the formula wherein R 10 and R 11 are the same or different and each is hydrogen, alkyl, haloalkyl, aralkyl, hydroxyalkyl, carboxy or alkoxycarbonyl, or R 10 and R 11 show a group which forms cycloalkyl in combination and l, m and n are each 0 or an integer of 1-3, in the formula (c), L is hydrogen, alkyl, aminoalkyl, mono- or dialkylaminoalkyl, tetrahydrofurfuryl, carbamoylalkyl, phthalimidoalkyl, amidino or a group of the formula wherein B is hydrogen, alkyl, alkoxy, aralkyl, aralkyloxy, aminoalkyl, hydroxyalkyl, alkanoyloxyalkyl, alkoxycarbonylalkyl, α-aminobenzyl, furyl, pyridyl, phenyl, phenylamino, styryl or imidazopyridyl, Q 1 is hydrogen, halogen, hydroxy, aralkyloxy or thienylmethyl, W is alkylene, Q 2 is hydrogen, halogen, hydroxy or aralkyloxy, X is alkylene, Q 3 is hydrogen, halogen, hydroxy, alkoxy, nitro, amino, 2,3-dihydrofuryl or 5-methyl-3-oxo-2,3,4,5-tetrahydropyridazin-6-yl; and Y is a single bond, alkylene or alkenylene, and in the formula (c), a broken line is a single bond or a double bond, and R 5 is hydrogen, hydroxy, alkoxy, alkoxycarbonyloxy, alkanoyloxy or aralkyloxycarbonyloxy; Rb is a hydrogen, an alkyl, an aralkyl, an aminoalkyl or a mono- or dialkylaminoalkyl; and Rc is an optionally substituted heterocycle containing nitrogen, an isomer thereof and/or a pharmaceutically acceptable acid addition salt thereof.