IFNG and neoplasm: Then after 2 days of culture of lymphocytes without tumor cells or anti-PD1 antibody, we stimulated lymphocytes with tumor cells at the 1:1 ratio and found that IFNγ secretion was reduced by the addition of tumor cells, implying IFNγ production in lymphocytes of LN#11, 12 and 20 were likely to be inhibited by some factors from the tumor cells.