Gastric Fundus/microbiology; Gastric Mucosa/microbiology; Gene Expression Profiling/methods; Helicobacter Infections/genetics; Helicobacter pylori/isolation & purification; Pyloric Antrum/microbiology; Stomach Neoplasms/microbiology; Transcription, Genetic; Adult; Antigens, Bacterial/genetics; Bacterial Proteins/genetics; Case-Control Studies; Cell Proliferation; Cell Transformation, Neoplastic/genetics; Cell Transformation, Neoplastic/pathology; France; Gastric Fundus/chemistry; Gastric Fundus/pathology; Gastric Mucosa/chemistry; Gastric Mucosa/pathology; Gene Expression Regulation, Bacterial; Gene Expression Regulation, Neoplastic; Genotype; Helicobacter Infections/complications; Helicobacter Infections/metabolism; Helicobacter Infections/microbiology; Helicobacter Infections/pathology; Helicobacter pylori/genetics; Helicobacter pylori/pathogenicity; Humans; Immunity, Mucosal/genetics; Inflammation/genetics; Neutrophil Infiltration; Oligonucleotide Array Sequence Analysis; Peptide Hydrolases/genetics; Phenotype; Pyloric Antrum/chemistry; Pyloric Antrum/pathology; RNA, Bacterial/analysis; RNA, Messenger/analysis; Receptors, Cell Surface/genetics; Signal Transduction/genetics; Stomach Neoplasms/genetics; Stomach Neoplasms/pathology; Tissue Array Analysis