Intriguingly, the TREM-1 expression levels on monocytes and neutrophils of RCC donors were significantly lower than those on cells from healthy donors (40.51 ± 3.788, RCC monocytes vs. 79.20 ± 14.89 healthy monocytes; 103.6 ± 16.65, RCC PMN vs. 191.5 ± 24.52 healthy PMN) (Figures 6A, B). Here, TREM1 is linked to renal cell carcinoma.