Immunologic Significance of CD80/CD86 or Major Histocompatibility Complex-II Expression in Thymic Epithelial Tumors oleh Hideki Ikeda, MD, Joji Nagasaki, MD, PhD, Daiki Shimizu, MD, Yuki Katsuya, MD, PhD, Hidehito Horinouchi, MD, PhD, Yukio Hosomi, MD, PhD, Etsuko Tanji, MS, Takekazu Iwata, MD, PhD, Makiko Itami, MD, PhD, Masahito Kawazu, MD, PhD, Yuichiro Ohe, MD, PhD, Takuji Suzuki, MD, PhD, Yosuke Togashi, MD, PhD