Clinical and morphological features of breast tumors with PIK3CA mutations in Russian patients: Observational study oleh Tatyana N. Sokolova, Tatyana I. Solov'eva, Svetlana N. Aleksakhina, Grigorii A. Janus, Alla Goryainova, Mark I. Gluzman, Rashida V. Orlova, Anastasiya I. Stukan, Ruslan A. Zukov, Alena V. Zyuzyukina, Yulia N. Murunova, Aleksandr V. Sultanbaev, Elena N. Vorobeva, Leonid M. Mikhaevich, Victoria N. Pyliv, Anna N. Lysenko, Zarema K. Khachmamuk, Andrey E. Kozlov, Sergey Y. Bakharev, Shahen G. Parsyan, Elena I. Rossokha, Leri D. Osidze, Irina S. Shumskaya, Anna V. Agaeva, Tatiana A. Kasmynina, Veronika V. Klimenko, Kamila T. Akhmetgareeva, Almira A. Vakhitova, Madina D. Chakhkieva, Vadim N. Dmitriev, Yana I. Bakshun, Alexey E. Vasilyev, Dunya D. Gasimly, Nadezhda A. Kravchenko, Dmitriy A. Maksimov, Alfia I. Nesterova, Ineza O. Sharvashidze, Christina H. Gadzaova, Galina G. Rakhmankulova, Zaur M. Khamgokov, Irina K. Amirkhanova, Ludmila V. Bembeeva, Vladimir I. Vladimirov, Oleg L. Petrenko, Natalia G. Ruskova, Ekaterina L. Serikova, Ksenia S. Subbotina, Svetlana A. Tkachenko, Victor L. Chang, Sanal P. Erdniev, Victoria S. Barbara, Anna V. Vasilevskaya, Yulia V. Mikheeva, Nataliya O. Popova, Ekaterina P. Startseva, Anastasia V. Fateeva, Denis Y. Yukalchuk, Anna A. Grechkina, Khedi S. Musaeva, Svetlana V. Odintsova, Alena S. Stel'makh, Petimat I. Khabibulaeva, Alina G. Khlobystina, Kseniya A. Shvaiko, Elena A. Basova, Irina A. Bogomolova, Marina B. Bolieva, Viktor E. Goldberg, Marianna V. Kibisheva, Konstantin V. Menshikov, Dmitrii V. Ryazanov, Mariya L. Stepanova, Yana A. Udalova, Aleksandr V. Shkradyuk, Yana S. Chapko, Anna A. Shchukina, Idris M. Khabriev, Dmitrii V. Kirtbaya, Alexey M. Degtyarev, Aleksandr A. Epkhiev, Yana A. Tyugina, Mirza A. Murachuev, Aleksandr V. Togo, Aglaya G. Ievleva, Evgenii N. Imyanitov