IFNG and lung cancer: This study evaluated whether the number of IFN‐γ‐releasing cells based on T‐SPOT counts could predict the response to ICI treatment, and we observed that the PHA/TBAg spot count (number of IFN‐γ‐releasing cells in response to PHA/TBAg stimulation) was significantly associated with PFS after starting ICI treatment for non‐small cell lung cancer (Figure 2 and Table 4).