Abstract. Background Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive malignancy. The American Cancer Society estimated approximately 48,960 patients diagnosed with PDAC in 2015, with more than 40,560 deaths attributable to the disease (1). The median 5-year survival of 6% is likely a result of the tumor's invasiveness and propensity toward metastasis (2). Once PDAC has metastasized to distant organs, the prognosis is dismal with an overall 5-year survival of only 1% (3, 4).Pulmonary metastasectomy has been shown to provide a survival benefit for colorectal cancer patients with pulmonary metastases (5). And recently, Karagkiouzis et al. (6) reported that combined surgical resection of primary non-small cell lung cancer and solitary hematogenous metastasis might be associated with improved survival. Recurrent PDAC, in comparison, has been notoriously difficult to manage surgically as it is typically characterized by aggressive growth, a multifocal pattern of recurrence, and technically unresectable disease (7). Therefore, although the lung is one of the common sites for distant metastasis in PDAC patients (8)
Patients and MethodsThis study evaluated 12 patients who underwent surgical treatment for pulmonary metastasis of pancreatic cancer and were then histologically diagnosed with PDAC between January 2004 and December 2016 at our institute. The pulmonary metastases were isolated without evidence of other sites of disease recurrence at the time of metastasectomy. The exclusion criteria for entry to the study were complications from other malignant diseases after enrollment. Thus, the lungs represented the first recurrence site of metastasis in this study. Data were collected from patient's medical charts, operative notes and pathologic examination records. Follow-up data were gathered from outpatient clinic records.Because individual patients were not identified in this retrospective study, the Ethics Review Board of our institute waived the requirement to obtain written informed consent from patients and approved the study protocol.We used the VATS technique to resect pulmonary metastases. Fortunately, there was no need for conversion to open thoracotomy for any patient in this series.
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