Higher T cell density associated with low stage [P = 0.00025 (tumour centre), P < 0.0001 (invasive margin)], high tumour grade (P < 0.0001, P = 0.0032), MMR deficiency (both P < 0.0001) and BRAF mutation (P < 0.0001, P = 0.062). The gene discussed is BRAF; the disease is neoplasm.