This application relates to methods of treating and/or preventing cancer (e.g., non-small cell lung cancer, renal cell carcinoma, hepatocellular carcinoma, thyroid carcinoma, colorectal cancer, gastrointestinal stromal tumors, breast cancer, prostate cancer, pancreatic cancer, or thymoma) in patients in need thereof comprising administering to the patient a therapeutically effective amount of a CDK inhibitor (e.g., milciclib) in combination with a therapeutically effective amount of another anticancer drug (e.g., sorafenib, lenvatinib, regorafenib, sunitinib, nivolumab, gemcitabine, and palbociclib).