In our clinical research we studied levels of neutrophils, eosinophils and CD8 T-lymphocytes in stroma and microenvironment of the gastric and colorectal adenocarcinomas, head and neck squamous cell carcinomas (33 patients: 15 with adenocarcinoma and 18 - with head and neck carcinoma). In gastric or colorectal adenocarcinoma expression of neutrophils directly correlates with regional lymph nodes involving, expression of CD8 has inversely correlation with differentiation of the tumor. In head and neck squamous cell carcinoma neutrophils expression inversely correlates with keratinization, CD8 expression has inversely correlation with the size of primary tumor and stage, and has direct correlation with keratinization. This study allows to draw a conclusion about heterogeneity of solid tumors depending on immunology of microenvironment, moreover squamous cell carcinoma of head and neck is more “immunocompetent” structure. Correlation analysis revealed prognostic and predictive value of immunological microenvironment, because showed impact of expression of CD8, neutrophils and eosinophils on clinical outcome of gastric and colorectal adenocarcinomas and squamous cell carcinoma of head and neck.