tumor microenvironment

Syllable breakdown

Dictionary meaning

the complex cellular and molecular ecosystem surrounding and infiltrating a tumour, comprising cancer cells, immune cells, stromal cells — fibroblasts and endothelial cells — extracellular matrix components, blood vessels, and signalling molecules that collectively shape tumour behaviour, immune evasion, and response to treatment; the tumor microenvironment is now understood as a critical determinant of cancer progression and therapeutic response, rather than the tumour mass alone; immunosuppressive microenvironments — characterised by regulatory T-cells, myeloid-derived suppressor cells, and inhibitory cytokines — allow tumours to evade immune destruction and can render immunotherapies ineffective; therapeutic strategies targeting the microenvironment include checkpoint inhibitors, agents that reprogram immunosuppressive cells, and combinations of immunotherapy with radiation or chemotherapy designed to promote immunogenic cell death and remodel the tumour's immune landscape