MANAGEMENT OF CHEMOTHERAPY-RESISTANT GASTRIC DIFFUSE LARGE B-CELL LYMPHOMA: A CASE REPORT Hüseyin Derya Dinçyürek; Müjgan Çözeli; Rashad Abdullayev; Emircan Kirac¿; Naciye Nur Tozluklu; Burak Demir; Birol Güvenç;