Galectin-3 plays an important regulatory role in cancer, inflammation, and fibrosis. Modified citrus pectin (MCP) binds to and blocks galectin-3, inhibiting cancer cell aggregation and metastasis. Several studies show MCP reduces tumor growth, angiogenesis, and metastasis in animal models of prostate, breast, and colon cancer. Clinical trials demonstrate MCP increases prostate-specific antigen doubling time in prostate cancer patients and provides clinical benefits such as improved quality of life for patients with advanced cancers. MCP may also enhance the effects of chemotherapy drugs and protect against post-radiation damage. Research indicates MCP activates T-cytotoxic cells, B-cells, and natural killer cells, stimulating anti-cancer