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Primary Orbital Lymphoma : A Retrospective Analysis of Results of Radiation Therapy  

Kim Sussan (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Ahn Seung Do (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Chang Hyesook (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Kim Kyoung Ju (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Lee Sang-wook (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Choi Eun Kyung (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Kim Jong Hoon (Department of Radiation Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Huh Jooryung (Department of Diagnostic Pathology, Asan Medical Center, College of Medicine, Ul-San University)
Suh Cheol Won (Department of Medical Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Kim Sung Bae (Department of Medical Oncology, Asan Medical Center, College of Medicine, Ul-San University)
Publication Information
Radiation Oncology Journal / v.20, no.2, 2002 , pp. 139-146 More about this Journal
Abstract
Purpose : This study evaluated the treatment outcomes, patterns of failure, and treatment related complications of primary lymphoma patients who received definitive radiation therapy. Materials and Methods : A retrospective analysis was undertaken for 31 patients with primary orbital lymphoma at the Asan Medical Center between February 1991 and April 2001. There were 18 males and 13 females with ages ranging from 3 to 73 years (median, 44 years). The involved sites were 9 conjunctivae, 12 eyelids and 10 other orbits. The histological types were 28 MALT lymphomas (low-grade B-cell lymphoma of mucosa-associated lymphoid tissue type), 1 diffuse large B-cell lymphoma, 1 anaplastic large cell lymphoma and 1 lymphoblastic lymphoma. The Ann Arbor stages were all IE $(100\%)$. Ann Arbor stage III or IV patients were excluded from this study, Bilateral orbital involvement occurred in 6 cases. Radiation therapy was given with one anterior port of high energy electrons $(6\~16\;MeV)$ for the lesions located at the anterior structures like the conjunctivae or eyelids. Lesions with a posterior extension or other orbital lesions were treated with 4 or 6 MeV photons with appropriately arranged portals. In particular, lens blocks composed of lead alloy were used in conjunctival or eyelid lesions. Twelve patients received chemotherapy. The median follow-up period was 53 months. Results : The 5-year overall, cause-specific, and disease-free survival was $91\%,\;96\%,\;and\;80\%$, respectively. The complete response rate 6 months after radiation therapy was $100\%$. Local recurrences were observed in 2 patients at 16 and 18 months after completion of radiation treatment. They were salvaged with additional radiation therapy. Two patients developed distant metastases. A MALT lymphoma patient with a lung relapse was successfully salvaged with radiotherapy, but the other lymphoblastic lymphoma patient with bone marrow relapse expired. There were no severe complications but 5 patients developed radiation-induced cataracts and 2 patients developed dry eye. Conclusion : Most primary orbital lymphomas consisted of MALT lymphomas. Radiation therapy was a successful treatment modality for orbital lymphoma without any severe complications. In cases of local relapses, radiation therapy is also a very successful salvage treatment modality.
Keywords
Orbital lymphoma; Radiation therapy; REAL classification;
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