TNF and gastric ulcer: This study aimed to explore the clinical efficacy of probiotics plus quadruple therapy on Serum levels of tumour necrosis factor-a (TNF-a), interleukin-6 (IL-6), C-reactive protein (CRP), gastrin (GAS) and motilin (MTL) in treating Helicobacter pylori (Hp)-positive gastric ulcer (GU).