In a study correlating gene and protein expression of 17 COVID-19 susceptibility genes with lung cancer prognosis, it was found that the hyperexpression of FYCO1, CXCR6, XCR1, and TAC4 in cancer cells was protective, whereas that of TMEM65 and OAS1 was a risk factor for SARS-CoV2 infection [54]. Here, XCR1 is linked to COVID-19.