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Future directions in intraoperative radiation therapy.
Hollis W Merrick1, Leonard L Gunderson, Felipe A Calvo
1Department of Surgery, Medical College of Ohio, 3065 Arlington Avenue, Toledo, OH 43614, USA. hmerrick@mco.edu
Surgical Oncology Clinics of North America
|March 3, 2004
Summary
Intraoperative radiation therapy (IORT) shows promise for certain cancers, particularly in reducing local recurrence in breast cancer patients. Further research is needed to optimize its effectiveness in complex cases like pancreatic cancer.
Area of Science:
- Oncology
- Radiation Oncology
- Surgical Oncology
Background:
- Establishing the effectiveness of intraoperative radiation therapy (IORT) as a treatment component for various malignancies remains challenging.
- Locally advanced pancreatic cancer presents a significant challenge, with limited median survival (9-12 months) and poor 2-year survival rates (10-20%) even with chemoradiation.
- Current systemic treatments have not substantially improved overall survival or reduced distant metastasis rates for pancreatic cancer.
Purpose of the Study:
- To evaluate the effectiveness of intraoperative radiation therapy (IORT) in managing various cancers, including challenging cases like pancreatic and breast cancer.
- To explore the potential of IORT in improving survival rates and reducing recurrence in both early-stage and recurrent malignancies.
- To highlight the need for further multi-institutional studies to clarify IORT's role and optimize treatment protocols.
Main Methods:
- Review of existing data and case reports on intraoperative radiation therapy (IORT) for pancreatic and breast cancers.
- Analysis of survival data and recurrence rates in patients treated with IORT, often in combination with surgery, chemotherapy, or external beam radiation therapy (EBRT).
- Discussion of ongoing randomized studies and the need for multi-institutional trials to validate findings.
Main Results:
- Encouraging 5-year survival reported in a small series of unresectable pancreatic cancer patients treated with IORT.
- A 33% 5-year survival rate observed in resectable pancreatic cancer patients treated with IORT as adjuvant therapy post-resection, compared to surgical resection alone.
- Intraoperative radiation therapy (IORT) as adjuvant therapy for early-stage breast cancer is associated with an extremely low incidence of in-breast local recurrence.
- Meaningful survival rates (20-40%) observed in patients with local or regionally recurrent cancers when IORT is part of a multimodal treatment approach.
Conclusions:
- Intraoperative radiation therapy (IORT) shows promise as an adjuvant therapy, particularly in reducing local recurrence rates for early-stage breast cancer.
- While IORT offers encouraging results in specific pancreatic cancer subsets, its overall impact on survival for locally advanced disease requires further investigation.
- Well-controlled multi-institutional studies are essential to determine the optimal role of IORT, especially when combined with systemic therapies and radiation sensitizers, for various malignancies.