Memory-like Natural Killer (NK) Cell Therapy in Patients With Renal Cell Carcinoma or Urothelial Carcinoma

The goal of this research study is to establish the safety and then to explore the effectiveness of infusing the combination of cytokine-induced memory-like (CIML) natural killer (NK) cells, a type of immune cell in the blood that is collected and bathed in special proteins to help identify and treat curtained advanced cancers, combined with low dose IL-2, which is a cytokine that activates immune cells, in advanced clear cell renal cell carcinoma and urothelial carcinoma. Names of the study therapies involved in this study are/is: * CIML NK cell therapy (a NK cell therapy) * IL-2 (a type of cytokine)