INTRODUCTION: A new series of 4-hydroxy-8-methyl-2-oxo-1,2-dihydroquinoline-3- carboxamide derivatives has been synthesized in good yields, followed by complete characterization using 1D-NMR, 2D-NMR, and IR techniques. METHODS: The final products contain amide, hydroxyl, and aromatic functional groups that usually show significant bioactivity. The target products have been examined towards three cancer cell lines, namely colorectal cancer cell line (HCT116), breast cancer cell line (MCF-7), and leukemia cell line (K562) in addition to the fibroblast cells, that were used as a model for normal human tissue. RESULTS: The anticancer results signified that compound 6 showed the most activity in the series accomplished with IC