What forms of fluid retention have been reported with avapritinib in patients with unresectable or metastatic GIST?

With avapritinib in unresectable or metastatic GIST, fluid retention includes facial, periorbital and peripheral oedema, pleural effusion, generalised oedema and ascites (at least common, including severe cases), plus laryngeal oedema and pericardial effusion (uncommon).