Stereotactic body radiation therapy plus induction or adjuvant chemotherapy for early stage but medically inoperable pancreatic cancer: A propensity score-matched analysis of a prospectively collected database
Authors Zhu X, Li F, Liu W, Shi D, Ju X, Cao YS, Shen Y, Cao F, Qing S, Fang F, Jia Z, Zhang H
Received 24 January 2018
Accepted for publication 2 April 2018
Published 21 May 2018 Volume 2018:10 Pages 1295—1304
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Dr Kenan Onel
Xiaofei Zhu,1,* Fuqi Li,1,* Wenyu Liu,2,* Dongchen Shi,1,* Xiaoping Ju,1 Yangsen Cao,1 Yuxin Shen,1 Fei Cao,1 Shuiwang Qing,1 Fang Fang,1 Zhen Jia,1 Huojun Zhang1
1Departmant of Radiation Oncology, Changhai Hospital affiliated to Navy Medical University, Shanghai, China; 2Departmant of Surgery, Changhai Hospital affiliated to Navy Medical University, Shanghai, China
*These authors contributed equally to this article
Background: To evaluate and compare the efficacy and safety of stereotactic body radiation therapy (SBRT) plus induction chemotherapy and SBRT plus adjuvant therapy.
Methods: Patients with radiographically resectable, biopsy-proven pancreatic cancer were enrolled. Data were prospectively collected from 2012 to 2016. Cox proportional hazards regression was used to identify factors predictive of survival. Propensity score matching analysis was performed to assess the efficacy of SBRT combined with different timing of chemotherapy.
Results: One hundred patients were enrolled with 48 receiving induction chemotherapy and 52 undergoing adjuvant chemotherapy. The median overall survival (OS) and progression-free survival (PFS) were 17.5 months (95% CI: 15.8–19.2 months) and 13.7 months (95% CI: 12.3–15.1 months), respectively. Patients with adjuvant chemotherapy (P <0.001), CA19-9 response (P <0.001) and BED10 (biological effective dose, α/β = 10) ≥ 60 Gy (P = 0.024) had a longer OS, while the former two correlated with PFS. Patients with more positive factors had a superior OS and PFS. After propensity score matching analysis, there were 23 patients from each group included in the analysis. Longer OS (23.1 months versus 15.6, P <0.001) and PFS (18.0 months versus 11.6 months, P <0.001) were found in patients with adjuvant chemotherapy compared with those with induction chemotherapy.
Conclusion: SBRT was safe and effective in early stage pancreatic cancer. Combined with adjuvant chemotherapy, SBRT could be an alternative for patients with resectable pancreatic cancer but not eligible for surgical resection.
Keywords: stereotactic body radiation therapy, early stage pancreatic cancer, resectable pancreatic cancer, medically inoperable, chemotherapy
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