RecruitingDietary supplementUrolithin A in Patients With Previously Untreated Solid Tumors Receiving Immune Checkpoint InhibitorsThe aim of this clinical study is to learn more about the effects of urolithin A (MitoPure®) on the immune system of cancer patients receiving immune checkpoint inhibitor-based therapies. Any effects will be compared with patients who take a placebo instead of urolithin A (MitoPure®).