To assess the activation status of tumour infiltrating ILC population, we investigated the expression of Major Histocompatibility Complex (MHC)-II, CD69, CD44, Killer cell lectin-like receptor G1 (KLRG1) and CCR7 in peripheral blood, benign and malignant breast tumour tissue and malignant and para-malignant tissue in GI cancers (Additional file 1: Figure S2, Additional file 1: Figure S3, Additional file 1: Figure S4, Additional file 1: Figure S5). Here, KLRG1 is linked to breast neoplasm.