Response to Alpelisib in an Adolescent With PIK3CA -Mutated Metastatic Gastrointestinal Stromal Tumor. - Cohen-Gogo, Sarah; Kanwar, Nisha; Shaikh, Furqan; Baertschiger, Reto M.; Shlien, Adam; Malkin, David; Putra, Juan; Coblentz, Ailish; Villani, Anita; Gupta, Abha A.; Morgenstern, Daniel A. (JCO Precision Oncology, 2022)