A Multicenter randomized folic acid-controlled clinical trial of traditional Chinese herbal medicine and Moluo Dan in the treatment of gastric precancerous lesion

INTERVENTION: Group C:Moluo Dan, 9g, taken orally, Tid;Group A:Folic acid, 5mg, taken orally, Tid;Group B:TCM "Bianzhen", 100‐150ml once orally, Tid; CONDITION: Gastric precancerous lesion (gastric epithelial dysplasia of mild or moderate degree at the base of chronic atrophic gastritis) PRIMARY OUTCOME: Incidence rate of gastric cancer;Histopathological score of gastric mucos; SECONDARY OUTCOME: Mucosal lesion score under endoscopy;Symptom score;Score of Patient reported outcome instrumen; INCLUSION CRITERIA: 1. Outpatient or inpatient fulfilling the diagnosis of gastric precancerous lesion by gastro‐endoscopy and histopathology; 2. Fulfilling the traditional Chinese medicine diagnosis of liver‐stomach disharmony syndrome, stomach‐yin insufficiency syndrome, spleen‐stomach damp‐heat syndrome, qi stagnation and spleen deficiency syndrome; 3. Age of 18–70, both males and females; 4. With informed written consent.