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Radiotherapy as salvage treatment of salivary duct carcinoma in major salivary glands without radical operations

Authors Di L, Qian K, Du C, Shen C, Zhai R, He X, Wang X, Xu T, Hu C, Ying H

Received 28 August 2018

Accepted for publication 21 October 2018

Published 21 November 2018 Volume 2018:10 Pages 6071—6078


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Rituraj Purohit

Lu Di,1–3,* Kai Qian,2,4,* Chengrun Du,1,2 Chunying Shen,1,2 Ruiping Zhai,1,2 Xiayun He,1,2 Xiaoshen Wang,1,2 Tingting Xu,1,2 Chaosu Hu,1,2 Hongmei Ying1,2

1Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai 200032, China; 2Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China; 3Department of Oncology, Liyang People’s Hospital, Changzhou, Jiangsu 213000, China; 4Department of Head and Neck Surgery, Fudan University Shanghai Cancer Center, Shanghai 200032, China

*These authors contributed equally to this work

Background: Salivary duct carcinoma (SDC) is an extremely rare and highly malignant carcinoma, and surgical radical resection is the most effective therapy. However, there were quite a proportion of patients receiving non-radical resections, and how to treat them remained controversial. Thus, the aim of this study is to evaluate whether postoperative radiotherapy could be a salvage treatment of SDC in major salivary glands without radical operations.
Patients and methods: We identified 40 pathologically diagnosed SDC patients who came to our hospital and did not receive radical operations. Thirty-three patients received at least one treatment (remedial operation, postoperative radiotherapy and chemotherapy), and seven patients only chose observation and received no further treatment. The prognostic indicators of the local–regional control (LRC) and distant disease-free survival were analyzed using the Kaplan–Meier methods and the Cox proportional hazards regression models.
Results: Thirteen patients experienced local–regional recurrence or local progression, and distant metastases were observed in 15 patients. Through multivariate analysis, we found that postoperative radiotherapy was associated with better LRC, but this kind of treatment did not show significant efficacy in the prevention of distant metastasis.
Conclusion: SDC is a rare, aggressive malignancy, and a substantial proportion of these patients experienced inadequate initial treatments. Although postoperative radiotherapy could not decrease distant metastases, it might help to improve LRC in patients with SDC.

Keywords: salivary duct carcinoma, prognosis, non-radical resection, postoperative radiotherapy

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