STING1 and neoplasm: To further confirm that the Arf1‐ablated tumor cells induced activation of the cGAS‐STING signaling pathway in DCs, we sorted DCs from tumors of mice implanted with either Scramble‐ablated or Arf1‐ablated tumor cells and examined the expression of target genes regulated by the cGAS‐STING pathway by RT‐qPCR.