IDO1 and melanoma: Interestingly, IFNγ has been described to promote immunosuppressive mechanisms in melanoma cells, such as increasing PD‐L1 or recruitment of regulatory T‐cells Tregs,[59] and treatment of lung adenocarcinoma with IFNγ leads to enhanced expression of CD47 and increased tumor mass.[60] However, we did not further investigate tumor cell characteristics, such as CD47, IDO, or PD‐L1 expression.