The Missing Trial Variable: A Case Report on Dietary Modification in a Patient with Durable Complete Remission After an Immunotherapy Clinical Trial for Metastatic Bladder Cancer.

A patient with metastatic bladder cancer has had an ongoing 9-year complete remission on a clinical trial of immunotherapy with nivolumab and ipimumab, but he also was following an intensive dietary and nutritional supplement regimen. Whether this combination or the immunotherapy alone brought about his good outcome is unknown but could be clarified in future trials by improved data collection about dietary and supplement choices.