CD8A and neoplasm: The CPWS from the food commensal Lcp. plantarum IMB19 (LpIMB19), a rhamnose-rich heteropolysaccharide (RHP) with immunomodulatory properties,96 was found to contribute to LpIMB19 antitumor immunity in mouse tumor models.233 RHP was the major effector responsible for the recruitment and expansion of tumor-specific CD8+ T cells, and purified RHP could suppress murine melanoma growth in mice.