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The Optimal Radiation Dose in Localized Head and Neck Diffuse Large Cell Lymphoma  

Koom Woong Sub (Department of Radiation Oncolgy, Yonsei University College of Medicine)
Suh Chang Ok (Department of Radiation Oncolgy, Yonsei University College of Medicine)
Kim Yong Bae (Department of Radiation Oncolgy, Yonsei University College of Medicine)
Shim Su Jung (Department of Radiation Oncolgy, Yonsei University College of Medicine)
Pyo Hongryull (Department of Radiation Oncolgy, Yonsei University College of Medicine)
Roh Jae Kyung (Yonsei Cancer Center, Yonsei University College of Medicine)
Chung Hyun Cheol (Yonsei Cancer Center, Yonsei University College of Medicine)
Kim Gwi Eon (Department of Radiation Oncolgy, Yonsei University College of Medicine)
Publication Information
Radiation Oncology Journal / v.20, no.4, 2002 , pp. 303-308 More about this Journal
Abstract
Purpose : To determine the optimal radiation dose in a localized non-Hodgkin's lymphoma of the head and neck in the treatment setting for combined chemoradiotherapy. Materials an Methods :Fifty-three patients with stage I and II diffuse large ceil non-Hodgkin's lymphoma of the head and neck, who were treated with combined chemoradiotherapy between 1985 and 1998 were retrospectively reviewed. The median age was 49 years, and the male-to-female ratio was approximately 1.6. Twenty-seven patients had stage 1 disease and 26 had stage II. Twenty-three patients had bulky tumors $(\geq5\;cm)$ and 30 had non-bulky tumors (<5 cm). The primary tumors arose mainly from an extranodal organ $(70\%)$, most cases involving Waldeyer's ring $(90\%)$. All patients except one were initially treated with $3\~6$ cycles of chemotherapy, which was followed by radiotherapy. Radiation was delivered either to the primary tumor area alone $(9\%)$ or to the primary tumor area plus the bilateral neck nodes $(91\%)$ with a minimum dose of 30 Gy $(range\;30\~60\;Gy)$. The failure patterns according to the radiation field were analyzed, and the relationship between the dose and the in-field recurrence was evaluated. Results : The 10-year overall survival and the 10-year disease free survival rates were similar at $75\%\;and\;76\%$, respectively. A complete response (CR) after chemotherapy was achieved in 44 patients $(83\%)$. Subsequent radiotherapy showed a CR in all patients. Twelve patients $(23\%)$ had a relapse of the lymphoma after the initial treatment. Two of these patients had a recurrence inside the radiation field. No clear dose response relationship was observed and no significant prognostic factors for the in-field recurrences were identified because of the small number of in-field recurrences. However, for patients with tumors <5 cm in diameter, there were no in-field recurrences after a radiation dose 30 Gy. The 2 in-field recurrences encountered occurred in patients with a tumor $\geq5\;cm$. Conclusion .A dose of 30 Gy is sufficient for local control in patients with a non-bulky (<5 cm), localized, diffuse large cell non-Hodgkin's lymphoma when combined with chemotherapy. An additional boost dose in the primary site is recommended for patients with bulky tumors $(\geq5\;cm)$.
Keywords
Localized diffuse large cell lymphoma; Combined chemoradiotherapy; Optimal radiation dose;
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