BACKGROUND: In clinical Ia (cT1N0M0) patients, some may have poor prognosis, for it might occur pathologic N1 (pN1) or N2 (pN2) postoperatively. The aim of this study is to determine the radiologicaland pathological factors related to clinical Ia adenocarcinoma. METHODS: The retrospective study was conducted on 297 clinical Ia adenocarcinoma patients resected at our hospital between May 2012 to December 2016. The clinical profiles, radiological and pathological features were analyzed between nodal upstaging group and non-upstaging group. RESULTS: Of 297 patients treated for cN0 tumors, 250 cases (84.2%) were confirmed postoperatively as having pN0 tumors, and 47 (15.8%) were confirmed as having pN1 or pN2 tumors. Female, low smoking index, micropapillary predominant and solid predominant adenocarcinoma, puresolid tumor and large tumor size were all more frequently seen in the nodal upstaging group than in the pN0 group (P<0.05). Logistic regression indicate that radiological solid tumor, micropapillary predominant and solid predominant adenocarcinoma and vessel invasionare the risk factors of nodal upstaging in clinical Ia adenocarcinoma. CONCLUSIONS Radiological solid tumors, micropapillary predominant and solid predominant adenocarcinoma andvessel invasion are risk factors for nodal upstaging for early stage lung cancer. Radiological solid tumors should perform SLND in Ia adenocarcinomas.
Adenocarcinoma ; diagnosis ; pathology ; Adenocarcinoma of Lung ; Female ; Humans ; Lung Neoplasms ; diagnosis ; pathology ; Male ; Middle Aged ; Neoplasm Staging ; Prognosis ; Retrospective Studies ; Risk Factors

BACKGROUND: More patients with pulmonary nodules are being referred to thoracic surgeons under the increasing use of computed tomography scans (CT). Impalpable peripheral subpleural solitary pulmonary nodules are difficult to be localized by video assisted thoracic surgery. Although some common techniques including CT-guided puncture positioning and electromagnetic navigation bronchoscopy (ENB)-guided methylene blue staining positioning, can bring good results in positioning, there are still some complications such as pneumothorax, hemorrhage and inaccurate positioning. Vectorial localization guided by electromagnetic navigational bronchoscopy followed by thoracoscopic resection is a novel alternative technique by us firstly for definitive diagnosis, which can avoid the possible injury of pleural or enlargement of the location area, providing some guidance for ENB-guided location technology. The main objective of this study was to evaluate the feasibility and our initial experience of vectorial localization guided by electromagnetic navigation followed by video-assisted thoracoscopic pulmonary solitary nodules resection. METHODS: We retrospectively analyzed 22 cases who undergoing vectorial localization of peripheral pulmonary lesion guided by electromagnetic navigation prior to video assisted lung resection, and characteristics and intraoperative outcomes were explored. RESULTS: Twenty-two nodules of twenty-two patients were all localized by this method successfully with an average location time (17.5±4.2) min. The average nodule size was (11.0±3.6) mm. The distance between the locatable guide probe (LG) and lesion on the electromagnetic navigation bronchoscopy screen was (14.5±10.1) mm. The distance between the lesion and probe mark on the dissected specimen was (15.3±11.0) mm. There was no displacement of any case. No conversion to thoracotomy was found. And there were no adverse events during the localization and operation procedure. Length of hospital stay was (3.8±1.2) d and the operative mortality was 0.0%. Malignant lesions were found in 19 patients and they were all completely resected with negative microscopic margins. CONCLUSIONS Our initial experience with vectorial localization of peripheral pulmonary lesion guided by electromagnetic navigation and minimally invasive resection proved that this technique was an alternative accurate and safe way for small pulmonary nodules. Thoracic surgeons should further investigate this method and apply it to clinical practice.