CD69 and neoplasm: Evaluating the phenotype of tumour infiltrating ILC in breast and malignant GI carcinomas showed a significantly higher frequency of ILC expressing the early activation marker CD69 compared with circulating innate lymphocytes (Fig. 4a and Additional file 1: Figure S2, Additional file 1: Figure S3, Additional file 1: Figure S4, Additional file 1: Figure S5).