Gastrointestinal Neoplasms/pathology; Lymphoma, B-Cell, Marginal Zone/pathology; Lymphoma, Large B-Cell, Diffuse/pathology; Tertiary Care Centers; Adult; Aged; Biomarkers, Tumor/analysis; Biomarkers, Tumor/genetics; Cell Proliferation; Cyclin-Dependent Kinase Inhibitor p16/analysis; Female; Gastrointestinal Neoplasms/chemistry; Gastrointestinal Neoplasms/epidemiology; Gastrointestinal Neoplasms/genetics; Humans; Immunoglobulin Heavy Chains/genetics; Immunohistochemistry; In Situ Hybridization; Ki-67 Antigen/analysis; Lymphoma, B-Cell, Marginal Zone/chemistry; Lymphoma, B-Cell, Marginal Zone/epidemiology; Lymphoma, B-Cell, Marginal Zone/genetics; Lymphoma, Large B-Cell, Diffuse/chemistry; Lymphoma, Large B-Cell, Diffuse/epidemiology; Lymphoma, Large B-Cell, Diffuse/genetics; Male; Middle Aged; Missouri/epidemiology; Neoplasm Grading; Neoplasm Staging; Oncogene Proteins, Fusion/genetics; Prognosis; Retrospective Studies; Translocation, Genetic; Tumor Suppressor Protein p53/analysis