Citation: Rr. Mehta et al., METABOLISM OF N-[4-HYDROXYPHENYL]RETINAMIDE (4-HPR) TO N-[4-METHOXYPHENYL]RETINAMIDE (4-MPR) MAY SERVE AS A BIOMARKER FOR ITS EFFICACY AGAINST HUMAN BREAST-CANCER AND MELANOMA-CELLS, European journal of cancer, 34(6), 1998, pp. 902-907