To compare how a growing tumour naturally affects the tumour-associated ILC2 (ta-ILC2) transcriptome, we conducted a comparative analysis of naïve-ILC2s without any stimulation, ta-non-activated-ILC2s (freshly isolated cells from the mouse lungs) and ta-activated-ILC2s (isolated cells from lungs and ex vivo stimulation with IL-33 and TSLP). The gene discussed is IL33; the disease is neoplasm.