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Clear cell adenocarcinoma of the lung: a population-based study

Authors Ke SJ, Wang P, Xu B

Received 13 September 2018

Accepted for publication 29 November 2018

Published 22 January 2019 Volume 2019:11 Pages 1003—1012


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Ahmet Emre Eskazan

Shu-Jun Ke,1,* Peng Wang,2,* Bing Xu1

1Department of Radiology, Shanghai Punan Hospital of Pudong New District, Shanghai 200215, China; 2Department of Radiology, Changzheng Hospital, Naval Medical University, Shanghai 200003, China

*These authors contributed equally to this work

Background: Clear cell adenocarcinoma of the lung (CCAL) is a rare diagnosis with poorly understood clinicopathological characteristics and disease progression.
Methods: A population cohort study was conducted using prospectively extracted data from the Surveillance, Epidemiology and End Results database for patients with ­histological diagnoses of CCAL. Propensity-matched analysis was performed for survival analysis.
Results: A total of 1,203 patients with CCAL were included. The median overall survival (OS) for all patients was 19.0 months (95% CI 16.0–22.0 months). Data for 1-, 3-, and 5-year OS were 58.7, 37.3, and 27.7%, respectively. Log-rank analysis showed that the prognoses of CCAL patients were better than those with non-CCAL adenocarcinoma after propensity-matched analysis (P<0.001). Cancer-directed surgery significantly improved median OS by almost 40 months (45.0 vs 5.0 months; P<0.01). Radiotherapy after surgery prolonged survival compared with patients who only received surgery (37.0 vs 17.0 months; P<0.01). Multivariate Cox analysis showed that older age (>65 years), larger lesions, and lymph node and distant metastases were independent prognostic factors for worse survival, while cancer-directed surgery was an independent protective factor. Five independent prognostic factors were identified and entered into the nomogram. The concordance index of the nomogram for predicting survival was 0.72 (95% CI 0.69–0.74). The calibration curves for the probability of 3-, 5-, and 10-year OS showed optimal agreement between nomogram prediction and actual observation.
Conclusion: CCAL is a rare pathology, and older age, larger lesions, metastases, and cancer-directed surgery were associated with prognosis. A prognostic nomogram was established to provide individual prediction of OS.

Keywords: clear cell adenocarcinoma of the lung, outcomes, SEER database, nomogram

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