Five-Year Survival  60 to 70 percent 

Stage III 
Standard Treatment 
• Maxillary sinus: Surgery with high-dose pre- or postoperative radiotherapy .  
• Ethimoid sinus: Extensive surgery followed by radiotherapy. 
• Sphenoid sinus: Radiotherapy. 
• Nasal cavity: Surgery or radiotherapy alone. Usually postoperative radiotherapy is preferred.
• Inverting papilloma: Same as Stage II. Radiotherapy may be needed if further surgery is unsuccessful.
• Melanomas and sarcomas: Surgery if possible, otherwise radiotherapy.
• Midline granuloma: Radiotherapy. 
• Nasal vestibule: Radiation first and surgery later if needed.
    Clinical trials are in progress for ethmoid sinus and nasal cavity tumors, using chemotherapy combinations in addition to surgery or radiotherapy.

Five-Year Survival  25 to 35 percent