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Comprehensive analysis of the clinicopathological features, targetable profile, and prognosis of mucinous adenocarcinoma of the lung

  • Original Article – Clinical Oncology
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Abstract

Purpose

The clinicopathological or genetic features related to the prognosis of mucinous adenocarcinoma are unknown because of its rarity. The clinicopathological or targetable features were investigated for better management of patients with mucinous adenocarcinoma of the lung.

Methods

We comprehensively evaluated the clinicopathological and genetic features of 60 completely resected mucinous lung adenocarcinomas. Targetable genetic variants were explored using nCounter and polymerase chain reaction, PD-L1 and TTF-1 expression were evaluated using immunohistochemistry. We analyzed the prognostic impact using the Kaplan–Meier method and log-rank test.

Results

Of the 60 enrolled patients, 13 (21.7%) had adenocarcinoma in situ/minimally invasive adenocarcinoma, and 47 (78.3%) had invasive mucinous adenocarcinoma (IMA). Fifteen patients (25%) showed a pneumonic appearance on computed tomography (CT). CD74-NRG1 fusion, EGFR mutations, and BRAF mutation were detected in three (5%), four (6.7%), and one (1.7%) patient(s), respectively. KRAS mutations were detected in 31 patients (51.7%). Two patients (3.5%) showed immunoreactivity for PD-L1. No in situ or minimally invasive cases recurred. IMA patients with pneumonic appearance had significantly worse recurrence-free survival (RFS) and overall survival (OS) (p < 0.001). Furthermore, IMA patients harboring KRAS mutations had worse RFS (p = 0.211). Multivariate analysis revealed that radiological pneumonic appearance was significantly associated with lower RFS (p < 0.003) and OS (p = 0.012). KRAS mutations served as an unfavorable status for RFS (p = 0.043).

Conclusion

Mucinous adenocarcinoma had a low frequency of targetable genetic variants and PD-L1 immunoreactivity; however, KRAS mutations were frequent. Pneumonic appearance on CT imaging and KRAS mutations were clinicopathological features associated with a worse prognosis.

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Data availability

All data is original from our study. No data from public or shared database was utilized.

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Acknowledgements

This work was conducted in part at the Analysis Center of Life Science, Natural Science Center for Basic Research and Development, Hiroshima University, Hiroshima, Japan. The authors thank Editage (www.editage.jp) for English language editing.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

Authors

Contributions

Conceptualization and Data Curation: DU, MI, YaT, and YM. Formal analysis: DU, MI, AGC, CA, and MMV. Investigation: DU, MI, AGC, RRL, APR, CA, KK, KA, and YuT. Supervision: MO and RR. Visualization: DU, MI, RRL, and MMV. Writing: all authors.

Corresponding author

Correspondence to Morihito Okada.

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Conflict of interest

The authors declare no conflict of interest.

Ethical approval

The study protocol was approved by the institutional review board at Hiroshima University (no. E–1546).

Consent to participate

Informed Consent was obtained from patients to stock tissues for research.

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Informed Consent was obtained from patients to for publication.

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Cite this article

Ueda, D., Ito, M., Tsutani, Y. et al. Comprehensive analysis of the clinicopathological features, targetable profile, and prognosis of mucinous adenocarcinoma of the lung. J Cancer Res Clin Oncol 147, 3709–3718 (2021). https://doi.org/10.1007/s00432-021-03609-3

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  • DOI: https://doi.org/10.1007/s00432-021-03609-3

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