The effect of 9-cis-retinoic acid (9-cis-RA) on the growth of eight gastric cancer cell lines was related to their transcription levels of mRNAs for retinoid receptors. Northern blot analysis showed that seven (TMK-1, MKN-1, −28, −45, −74, HSC-39, KATO-III) out of eight gastric cancer cell lines synthesized mRNAs for retinoic acid receptors (RARs) and retinoid X receptor-α (RXR-α). MKN-7 cells did not transcribe either RARs or RXR-α at the mRNA level although they appeared to have no alterations at the gene level. The growth of all of the cell lines except for MKN-7 cells was inhibited by 1 × 10 −6 M 9-cis-RA. Cell cycle distribution analysis revealed that G 0 -G 1 arrest was not induced by exposure to 9-cis-RA in the sensitive TMK-1 and KATO-III cells or the resistant MKN-7 cells. Interestingly, 9-cis-RA temporarily increased the amount of the cyclin dependent kinase (cdk) inhibitor, Waf1/Cip1/Sdi1/p21 protein, and also reduced the amount of cdk-7, epidermal growth factor receptor (EGFR) and cyclin D1 proteins, followed by reduction in phosphorylation of the product of the retinoblastoma tumor suppressor gene (Rb) in the sensitive TMK-1 cells, but not in the resistant MKN-7 cells. These results suggest that 9-cis-RA has a cytostatic effect on gastric cancer cells that synthesize the receptor molecules through cell cycle regulatory machinery.