“Antiproliferative studies in vitro suggested that the growth of three human breast carcinomas (MCF-7, MDA-MB-231, and MDA-MB-468), … carcinoma (NIH-OVCAR-3), and a malignant melanoma (SK-MEL-1) was inhibited to a greater degree by combination treatment with human IFN-beta … RA compared … agents.”
“Established, 6-week-old NIH-OVCAR-3 tumors underwent regression when treated with the combination of IFN-beta and RA but not with single-agent therapy.”
“Sequential treatment of MCF-7 cells with RA followed by IFN-beta was more effective at inhibiting growth than treatment with IFN-beta followed by RA, suggesting that RA modulated the anticellular response of IFN-beta rather than the converse.”