PIK3R1 and gastric cancer: For example, circular RNA circCACTIN promotes gastric cancer progression by sponging miR‐331‐3p and regulating TGFBR1 expression.21 A novel circular RNA hsa_circ_0008035 contributes to gastric cancer tumorigenesis through targeting the miR‐375/YBX1 axis.22 Circular RNA AKT3 upregulates PIK3R1 to enhance cisplatin resistance in gastric cancer via miR‐198 suppression.23 However, it is basically no research report on hsa_circ_101882 in GC.