Furthermore, the somatic mutation waterfall plot displayed the mutation frequency of ARGs in HCC, and the analysis indicated that PIK3CA, TSC2, MTOR, SRC, NOTCH1, and NTRK2 had mutation frequencies of 4%, 3%, 2%, 2%, 2%, and 2%, respectively (Figure 1B). The gene discussed is NTRK2; the disease is hepatocellular carcinoma.