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Gastric cancer is the fourth most common malignant tumor and has been considered as one of the leading causes of cancer-related death worldwide.The identification of the molecular mechanism during gastric cancer progression is urgently needed,which will help to develop more effective treatment strategies.As a component of the human mitoribosome,immature colon carcinoma transcript-1 (ICT1) might be involved in tumor formation and progression.However,its biological function and the corresponding mechanism in gastric cancer have been poorly characterized.To study the mechanism of ICT1 in gastric cancer,we first investigated the mRNA levels of ICT1 in human normal and gastric cancer tissues using datasets from the publicly available Oncomine database.The results showed that ICT1 is overexpressed in gastric cancer tissues.Then in order to study the role of ICT1 in gastric cancer,two shRNAs were used to silence ICT1 in MGC80-3 and AGS cells.Functional analysis showed ICT1 knockdown significantly inhibited the proliferation of gastric cancer cells and induced apoptosis.Further,mechanistic study demonstrated that ICT1 silencing induced cell-cycle arrest at G2/M phase via the suppression of cyclin A2 and cyclin B1.In addition,ICT1 silencing also increased cleaved caspase-3 and activated PARP in gastric cancer cells.These findings suggest that ICT1 may play a crucial role in promoting gastric cancer proliferation in vitro.