STIL and cancer: Previous studies have shown that STIL mutation causes the left‐right asymmetry defects in mouse,10, 11 disorganized mitotic spindles in zebrafish12 and primary microcephaly in human.13 However, elevated STIL expression can trigger chromosome instability and cancer.14 Given that STIL is an regulator of cell cycling by promoting the centriolar duplication we tested the impact of STIL silencing on the proliferation and clonogenicity of GC cells.