Letter to the Editor ITMIG 2021 Tumor Board: a case of a 37-year-old man with TNM stage IVA thymoma Marcin Zielinski, Anja C. Roden, Mylene T. Truong, Dirk Van Raemdonck, Ritsuko Komaki, Heather Wakelee, Malgorzata Szolkowska