The value of local consolidative therapy in Osimertinib-treated non-small cell lung cancer with oligo-residual disease

Ya Zeng, Jianjiao Ni, Fan Yu, Yue Zhou, Yang Zhao, Shuyan Li, Tiantian Guo, Li Chu, Xi Yang, Xiao Chu, Xuwei Cai, Zhengfei Zhu, Ya Zeng, Jianjiao Ni, Fan Yu, Yue Zhou, Yang Zhao, Shuyan Li, Tiantian Guo, Li Chu, Xi Yang, Xiao Chu, Xuwei Cai, Zhengfei Zhu

Abstract

Background: There was no study investigating real-world utilization and outcome of LCT in Osimertinib-treated NSCLC with oligo-residual disease. This study was to analyze the clinical value of local consolidative therapy (LCT) in Osimertinib-treated non-small cell lung cancer (NSCLC) patients with oligo-residual disease.

Methods: Patients receiving standard Osimertinib treatment and developing oligo-residual disease (five or fewer residual metastatic lesions) were retrospectively reviewed. Local therapies performed to the oligo-residual tumor lesions or primary lung site before Osimertinib treatment failure were considered as LCT.

Results: Of 108 patients recruited, first-line and second-line Osimertinib were administered in 25 and 83 patients, respectively, while LCT was performed in 14 patients. With a median follow-up of 43.6 months, 69 patients developed progressive disease. LCT significantly improved progression-free survival (PFS) (NR vs 12.8 months, p = 0.01) and was independently associated with prolonged PFS (HR = 0.29, 95%CI 0.12 to 0.68, p = 0.004). Patients receiving LCT had a numerically longer overall survival (OS) (85.8 vs 77.1 months, p = 0.58) and after adjusting for potentially confounding factors, LCT was associated with a non-significantly prolonged OS (HR = 0.37, 95%CI 0.12-1.16, p = 0.089). Pattern of failure analyses indicated that progressive disease developed at the originally existed oligo-residual lesions in 76.2% of the 63 patients who didn't receive LCT and had Osimertinib treatment failure. Of note, 7 (70%) of the 10 patients who had oligo-residual cranial disease but didn't receive LCT, developed more than five progressive lesions in the brain, which were no longer suitable for stereotactic radiosurgery.

Conclusion: Among Osimertinib-treated NSCLC patients having oligo-residual lesions, LCT could improve local control and significantly increase PFS, which need to be verified by further investigations.

Keywords: Local consolidative therapy; Non-small cell lung cancer; Oligo-residual disease; Osimertinib.

Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Patients enrollment flowchart
Fig. 2
Fig. 2
Progression-free survival (PFS) curves of LCT group and non-LCT group. The median PFS of LCT group was not reached and 12.8 months for patients in non-LCT group. LCT: local consolidative therapy
Fig. 3
Fig. 3
Overall survival (OS) curves of LCT group and non-LCT group. The median OS were respectively 85.8 months and 77.1 months for patients in LCT group and non-LCT group. LCT: local consolidative therapy
Fig. 4
Fig. 4
The details of failure patterns of two groups. LCT: local consolidative therapy

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Source: PubMed

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