Reversal of inherent multidrug-resistance in primary human renal cell carcinoma cell cultures by S 9788.

In a panel of 14 primary cultures of human renal cell carcinomas the reversal of inherent multidrug-resistance by S 9788, a new triazinoaminopiperidine derivative, was analysed. In combination with doxorubicin S 9788 revealed an evident reversal of multidrug resistance in 12 cell cultures. Two cell cultures remained unaffected. An association between reversal and P-glycoprotein (P-170) expression suggests that S 9788 exerts its activity through P-glycoprotein.