The efficacy of immunotherapy and chemoimmunotherapy in patients with advanced rare tumors: A Turkish oncology group (TOG) study oleh Deniz Can Guven, Musa Baris Aykan, Harun Muglu, Ertugrul Bayram, Kaan Helvaci, Bengü Dursun, Melisa Celayir, Elvin Chelebiyev, Erdinc Nayir, Mustafa Erman, Ahmet Sezer, Yuksel Urun, Umut Demirci, Ozlem Er, Umut Disel, Ahmet Bilici, Cagatay Arslan, Nuri Karadurmus, Saadettin Kilickap