Shogo Matsuda1,2, Hiroyoshi Iguchi3, Takuhito Tada4, Masako Hosono5,6, Masahiko Osawa7, Yuuko Kuwae7, Hideyuki Morimoto5,6, Eiichiro Okazaki5,6, Kosuke Amano5,6, Yoshitaka Miki5,6, Shinichi Tsutsumi5,6, Yasuhiko Shimatani5,6, Yukio Miki5,6. 1. Department of Diagnostic and Interventional Radiology, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno-ku, Osaka, 5458585, Japan. shogo313@gmail.com. 2. Department of Radiation Oncology, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno-ku, Osaka, 5458585, Japan. shogo313@gmail.com. 3. Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno-ku, Osaka, 5458585, Japan. 4. Department of Radiology, Izumi Municipal Hospital, 4-10-10, Fuchucho, Izumi, 5940071, Japan. 5. Department of Diagnostic and Interventional Radiology, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno-ku, Osaka, 5458585, Japan. 6. Department of Radiation Oncology, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno-ku, Osaka, 5458585, Japan. 7. Department of Diagnostic Pathology, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno-ku, Osaka, 5458585, Japan.
Abstract
PURPOSE: The latest version of the World Health Organization (WHO) histologic classification of salivary gland malignancies was published in 2005. To contribute to data accumulation on the basis of this latest version, a retrospective study was performed. MATERIALS AND METHODS: Participants comprised 27 patients who underwent postoperative radiotherapy between 2000 and 2013. Two, eight, and 17 patients were allocated to low, intermediate, and high-grade groups, respectively, in accordance with the latest WHO classification. The radiation field included the tumor bed and ipsilateral regional lymph nodes for 25 patients. The radiation dose was 46-60 Gy (median 56 Gy). RESULTS: Median duration of follow-up was 41 months. Five-year locoregional control was 89 %. Two patients experienced local recurrence and 7 patients developed distant metastases. No patients in the low or intermediate-grade groups developed distant metastases. Overall 3 and 5-year survival for all patients were 81 and 75 %, respectively. Five-year overall survival for patients in the low and intermediate-grade groups was 100 %, compared with 59 % for patients in the high-grade group (p = 0.03). CONCLUSION: Favorable locoregional control was achieved for patients with malignant parotid tumors who underwent surgery plus postoperative radiotherapy. Patients with high-grade tumors frequently experienced distant metastases and prognosis was poor.
PURPOSE: The latest version of the World Health Organization (WHO) histologic classification of salivary gland malignancies was published in 2005. To contribute to data accumulation on the basis of this latest version, a retrospective study was performed. MATERIALS AND METHODS:Participants comprised 27 patients who underwent postoperative radiotherapy between 2000 and 2013. Two, eight, and 17 patients were allocated to low, intermediate, and high-grade groups, respectively, in accordance with the latest WHO classification. The radiation field included the tumor bed and ipsilateral regional lymph nodes for 25 patients. The radiation dose was 46-60 Gy (median 56 Gy). RESULTS: Median duration of follow-up was 41 months. Five-year locoregional control was 89 %. Two patients experienced local recurrence and 7 patients developed distant metastases. No patients in the low or intermediate-grade groups developed distant metastases. Overall 3 and 5-year survival for all patients were 81 and 75 %, respectively. Five-year overall survival for patients in the low and intermediate-grade groups was 100 %, compared with 59 % for patients in the high-grade group (p = 0.03). CONCLUSION: Favorable locoregional control was achieved for patients with malignant parotid tumors who underwent surgery plus postoperative radiotherapy. Patients with high-grade tumors frequently experienced distant metastases and prognosis was poor.
Entities:
Keywords:
Malignant parotid tumor; Postoperative radiotherapy; Surgery; WHO classification
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Authors: R A Frankenthaler; M A Luna; S S Lee; K K Ang; R M Byers; O M Guillamondegui; P Wolf; H Goepfert Journal: Arch Otolaryngol Head Neck Surg Date: 1991-11