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Chen, Jian; Mao, Jingfang; Ma, Ningyi; Wu, Kai-Liang; Lu, Jiade; Jiang, Guo-Liang
BMC cancer, 06/2021, Volume: 21, Issue: 1Journal Article
Background Tracheobronchial adenoid cystic carcinoma (TACC) is a rare tumour. About one-third of patients miss their chance of surgery or complete resection as it is mostly detected in the advanced stage; hence, photon radiotherapy (RT) is used. However, the outcomes of photon RT remain unsatisfactory. Carbon ion radiotherapy (CIRT) is thought to improve the therapeutic gain ratio; however, the outcomes of CIRT in TACC are unclear. Therefore, we aimed to assess the effects and toxicities of CIRT in patients with TACC. Methods The inclusion criteria were as follows: 1) age 18-80 years; 2) Eastern Cooperative Oncology Group Performance Status 0-2; 3) histologically confirmed TACC; 4) stage III-IV disease; 5) visible primary tumour; and 6) no previous RT history. The planned prescription doses of CIRT were 66-72.6 GyE/22-23 fractions. The rates of overall survival (OS), local control (LC), and progression-free survival (PFS) were calculated using the Kaplan-Meier method. Treatment-induced toxicities and tumour response were scored according to the Common Terminology Criteria for Adverse Events and Response Evaluation Criteria in Solid Tumors, respectively. Results Eighteen patients with a median age of 48 (range 30-73) years were enrolled. The median follow-up time was 20.7 (range 5.8-44.1) months. The overall response rate was 88.2%. Five patients developed lung metastasis after 12.2-41.0 months and one of them experienced local recurrence at 31.9 months after CIRT. The rates of 2-year OS, LC, and PFS were 100, 100, and 61.4%, respectively. Except for one patient who experienced grade 4 tracheal stenosis, which was relieved after stent implantation, no other greater than or equai to3 grade toxicities were observed. Conclusions CIRT might be safe and effective in the management of TACC based on a short observation period. Further studies with more cases and longer observation are warranted. Keywords: Tracheobronchial carcinoma, Adenoid cystic carcinoma, Carbon ion radiotherapy
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