IFNG and hepatocellular carcinoma: Significant increases in frequencies of IFNγ+ cells, compared with that of R-cases, were observed in the 6mo-cases group after stimulation with PPD [3.4% (1.1–5.5) and 5.4% (2.3–17) for R-case and 6mo-cases, respectively] and HCC [23% (12–30) and 33% (22–48) for R-cases and 6mo-cases, respectively] (Figure 4B; middle).