Abstract
Purpose
SMAD4 mutational status correlates with pancreatic ductal adenocarcinoma (PDAC) failure pattern. We investigated in a subset of locally advanced patients submitted to radiofrequency ablation (RFA) whether the assessment of SMAD4 status is a useful way to select the patients.
Methods
Clinical, radiological, and follow-up details of patients submitted to RFA for locally advanced pancreatic cancer (LAPC), in whom cytohistological material was available at our institution, were retrospectively retrieved. SMAD4 expression was evaluated by immunohistochemistry (IHC) and considered “negative” or “positive.” The survival analysis was conducted using Kaplan-Meier and Cox proportional hazards models.
Results
The study population consisted of 30 patients. Thirteen patients (43.3%) received RFA upfront, whereas 17 (56.7%) after induction treatments. SMAD4 was mutant in 18 out of 30 patients (60%). The overall estimated post-RFA disease-specific survival (DSS) was 15 months (95% CI 11.64–18.35). The estimated post-RFA DSS of patients with wild-type and mutant SMAD4 was 22 and 12 months, respectively (log-rank p < 0.05). At the multivariate analysis, SMAD4 was the only independent predictor of survival (p = 0.05). The pattern of failure was not associated with SMAD4 status (p = 0.4).
Conclusions
Within patients undergoing RFA for LAPC, SMAD4 analysis could segregate a subgroup of subjects with improved survival, who likely benefited from tumor ablation.
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The authors thank Ossian Elkington for his kind English language editing of the manuscript.
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AIRC 5xmille (grant no. 12182), European Community FP7 Grant (Cam-PaC, agreement no: 602783), FIMP-Ministero Salute (CUP_J33G13000210001). The funding agencies had no role in the collection, analysis, and interpretation of data and in the writing of the manuscript.
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Study conception and design: SP, GDM, RS, MDM, CB, AS; acquisition of data: CG, ES, GDM, IC, AG, IF, BR; analysis and interpretation of data: SP GM, GM, RG, RS, MDO; drafting of the manuscript: SP, GM, MDP, GM, AG, RS, IC; critical revision of the manuscript: SP, GM, IC, GDM, MDP, GM, RS, AG, IF, RG, AS, RS, CB, MDO.
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Paiella, S., Malleo, G., Cataldo, I. et al. Radiofrequency ablation for locally advanced pancreatic cancer: SMAD4 analysis segregates a responsive subgroup of patients. Langenbecks Arch Surg 403, 213–220 (2018). https://doi.org/10.1007/s00423-017-1627-0
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DOI: https://doi.org/10.1007/s00423-017-1627-0