Prognostic significance of PIK3CA immunoexpression and mutation status in triple-negative breast cancer. - Karakaya, Yeliz Arman; Verim, Cennet; Can, Feyza Zisan; Selcuk, Hacer; Ipin Cekic, Zulal Secil; Yilmaz, Sevda; Comut, Erdem (Annals of Medical Research, 2026)