PRIMARY OBJECTIVE: I. To assess the effect of fermented wheat germ (FWG) nutritional supplementation on natural killer (NK) cell killing activity in peripheral blood of cancer patients being treated with standard of care (SOC) immunotherapy who have voluntarily decided to take the FWG nutritional supplement.
I. To assess immunologic effects of FWG in subjects with cancer treated with checkpoint inhibitor (CPi)-based therapy.
II. To archive stool specimens of subjects with cancer treated with CPi-based therapy for future non-interventional studies for subsequent analysis at completion of study.
III. To evaluate toxicities of FWG in subjects with cancer treated with checkpoint inhibitor (CPi)-based therapy.
IV. To assess immunologic effects of FWG in patients with cancer treated with CPi immune-oncology-based therapy (Immune Correlates).
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