IMRT in oral cavity cancer

Area of Science:

• Oncology
• Radiation Oncology
• Head and Neck Cancer

Background:

• Oral cavity cancer (OCC) generally has a poorer prognosis than other head and neck cancers (HNC), except for early stages.
• Intensity modulated radiation therapy (IMRT) is a modern radiation technique used for HNC treatment.
• This study evaluates IMRT outcomes specifically for OCC patients.

Purpose of the Study:

• To assess the disease outcome in oral cavity cancer (OCC) patients treated with intensity modulated radiation therapy (IMRT).
• To compare IMRT outcomes in OCC with historical data from conventional 3D radiation therapy (3DCRT) and surgery alone.

Main Methods:

• Retrospective analysis of 58 OCC patients treated with IMRT between 2002 and 2007.
• Patients received 60-70 Gy doses, often with concurrent cisplatin-based chemotherapy (78%).
• Outcomes were compared to historical cohorts treated with 3DCRT and surgery alone, using Kaplan-Meier curves.

Main Results:

• Postoperative IMRT for OCC achieved the highest local control (LC) rate at 92% at 2 years.
• Definitive IMRT for OCC showed lower LC rates (approx. 40%) compared to postoperative IMRT.
• Early-stage T1 OCC had significantly higher LC (95%) than locally advanced or recurrent stages (50-60%).

Conclusions:

• Postoperative IMRT is recommended for OCC with unfavorable features (e.g., advanced stage, nodal involvement, close margins, recurrence).
• Definitive IMRT for OCC yields unsatisfactory loco-regional outcomes, similar to definitive 3DCRT.
• IMRT demonstrates significant benefit in the postoperative setting for oral cavity cancer.