For mutations in ARID2, a subunit of the PBAF chromatin-remodeling complex, five patients harbored six mutations: only p.Q916* was shared by the three tumor samples from P10, suggesting loss-of-function ARID2 as a driver in this patient; in the other four patients, ARID2 mutations were only detected in GBC or BilIN samples. Here, ARID2 is linked to neoplasm.