Immunofluorescence further found that (61.6 ± 7.5) % of IL-17a protein was expressed by CD66b + neutrophils in the tumor stroma which was significantly higher than that in the nontumoral tissues (15.4 ± 5.8)% (P < 0.001) (Fig. 3c). The gene discussed is CEACAM8; the disease is neoplasm.