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Interstitial Brachytherapy for Orbital Sebaceous Carcinoma
Feng Li1, Robert D Stewart2, Paul T Finger1,2
1The Department of Ocular Tumor, Orbital Disease and Ophthalmic Radiation Therapy, The New York Eye Cancer Center, New York, New York, U.S.A.
Ophthalmic Plastic and Reconstructive Surgery
|July 27, 2021
Summary
This study presents a novel orbital brachytherapy technique for sebaceous carcinoma, combining surgery and radiation. The treatment successfully eradicated the tumor while preserving ocular structures and vision.
Area of Science:
- Oncology
- Ophthalmology
- Radiation Oncology
Background:
- Sebaceous carcinoma is an aggressive eyelid cancer with metastatic potential.
- Standard treatments like surgery and external beam radiotherapy (EBRT) have limitations for larger tumors.
- Ocular structure tolerance to EBRT is a significant concern.
Observation:
- A case of orbital sebaceous carcinoma was treated with excision, cryotherapy, and amniotic membrane reconstruction.
- Adjuvant electron interstitial high-dose rate brachytherapy-boost was administered after initial healing.
- This technique aimed to optimize radiation dose distribution within the orbit.
Findings:
- The combined approach successfully delivered a radiation boost to the tumor bed.
- It increased radiation dose to the inferonasal orbit while sparing surrounding tissues.
- At 1-year follow-up, there was no tumor recurrence, preserved visual acuity (20/20), and no significant ocular complications.
Implications:
- Interstitial brachytherapy-boost offers a viable method for dose escalation in orbital sebaceous carcinoma.
- This technique can improve tumor control while minimizing damage to critical ocular structures.
- It represents a promising strategy for managing complex orbital cancers.
