FAP immunohistochemistry score was positively correlated with 68Ga-FAPI-46 SUVmax (r = 0.781 [95% CI, 0.376–0.936], p < 0.001) and SUVmean (r = 0.783 [95% CI, 0.379–0.936], p < 0.001) in cancer tissues [39]. Here, FAP is linked to cancer.