JRSBRT 9.2, p. 91-99

Impact of TP53 mutations on brain metastasis control in non-small cell lung cancer patients undergoing stereotactic radiosurgery
Jim X. Leng, Chang Su, David J. Carpenter, Warren Floyd, Eugene Vaios, Rachel Shenker, Peter G. Hendrickson, Will Giles, Trey Mullikin, Scott R. Floyd, John P. Kirkpatrick, Michelle Green and Zachary J. Reitman

Purpose: To investigate whether TP53 variants may be correlated with overall survival and local control following stereotactic radiosurgery (SRS) for brain metastases (BMs) from non-small cell lung cancer (NSCLC).

Methods: Patients undergoing an initial course of SRS for NSCLC brain metastases between 1/2015 and 12/2020 were retrospectively identified. Overall survival and freedom from local intracranial progression (FFLIP) were estimated via Kaplan-Meier method. Cox models assessed TP53 variant status (pathogenic variant, PV; variant not detected, ND).

Results: 255 patients underwent molecular profiling for TP53, among whom 144 (56%) had a TP53 PV. Median follow-up was 11.6 months. OS was not significantly different across TP53 status. A trend toward superior FFLIP was observed for PV (95% CI 62.9 months-NR) versus ND patients (95% CI 29.4 months-NR; p=0.06). Superior FFLIP was observed for patients with one TP53 variant versus those with TP53 ND.

Conclusion: Among NSCLC patients with BMs, the potential association between TP53 status and post-SRS FFLIP warrants further investigation in a larger prospective cohort.

Keywords: SRS, NSCLC, TP53, brain metastases

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