OcellO offers compound testing services using co-cultures of cancer and immune cells. These test the ability of compounds to potentiate infiltration of T cells into the tumor and enhance their cytotoxic activity. Diverse cultured tumor tissues, including tumoroids derived from established tumor cell lines, colorectal cancer organoids and PDX material, can be used in these assays. Tumoroids are co-cultured with partially HLA-matched PBMCs from healthy donors, purified T cell populations (e.g. CD8+, CD3+), engineered T cells, CAR T cells or myeloid cells differentiated in vitro (e.g. DCs, M1 and M2 macrophages).