Combination of PI3K and MEK inhibitors yields durable remission in PDX models of PIK3CA-mutated metaplastic breast cancers. - Coussy, F.; El Botty, R.; Lavigne, M.; Gu, C.; Fuhrmann, L.; Briaux, A.; de Koning, L.; Dahmani, A.; Montaudon, E.; Morisset, L.; Huguet, L.; Sourd, L.; et al. (Journal of Hematology & Oncology, 2020)