Mean Platelet Volume to Lymphocyte Ratio: A New Biomarker Predicting Response in Patients with Solid Tumors Treated with Nivolumab oleh Hasan Cagri Yildirim, Fatih Kus, Deniz Can Guven, Ece Karaca, Yunus Kaygusuz, Omer Dizdar, Sercan Aksoy, Mustafa Erman, Suayib Yalcin, Saadettin Kilickap