Letter to the Editor A novel diagnostic biomarker for human uterine leiomyosarcoma: PSMB9/β1i Takuma Hayashi, Miki Kawano, Kenji Sano, Tomoyuki Ichimura, Gal Gur, Pnina Yaish, Dorit Zharhary, Yae Kanai, Susumu Tonegawa, Tanri Shiozawa, Nobuo Yaegashi, Ikuo Konishi Abstract Takuma Hayashi (Shinshu University School of Medicine) discussed a novel biomarker for detecting human uterine leiomyosarcoma (LMS).