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The role of spine stereotactic radiosurgery for patients with breast cancer metastases

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Abstract

Purpose

Breast cancer that metastasizes to the spine is associated with low quality of life and poor survival. Radiosurgery has an increasing role in this patient population. This single-institution (2003–2023) study analyzes clinical outcomes and prognostic factors for patients who underwent spinal stereotactic radiosurgery (SSRS) for metastatic breast cancer.

Methods

Ninety patients (155 unique breast cancer spinal metastases) were treated with SSRS. The median age was 57 years (range: 35–88), and the median KPS was 80 (range: 40–100). Forty-two (27%) lesions were managed surgically prior to radiosurgery. At SSRS, 75 (48%) lesions impinged or compressed the spinal cord per the epidural spinal cord scale (ESCC). Seventy-nine (51%) lesions were categorized as potentially unstable or unstable by the Spinal Instability Neoplastic Score (SINS).

Results

The median follow-up was 15 months (range: 1–183). The median single-session tumor volume was 25.4 cc (range: 2–197), and the median single-fraction prescription dose was 17 Gy (range: 12–25). Seven (5%) lesions locally progressed. The 1-, 2-, and 5-year local control rates were 98%, 97%, and 92%, respectively. The median overall survival (OS) for the cohort was 32 months (range: 2–183). The 1-, 2-, and 5-year OS rates were 72%, 53%, and 30%, respectively. On univariate analysis, KPS ≥ 80 (p = 0.009, HR: 0.51, 95% CI: 0.31–0.84) was associated with improved OS. Patient-reported pain improved (68%), remained stable (29%), or worsened (3%) following radiosurgery. Fifteen (10%) radiation-induced toxicities were reported.

Conclusions

Spinal radiosurgery is a safe and highly effective long-term treatment modality for metastases to the spine that originate from breast cancer.

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Data availability

No datasets were generated or analysed during the current study.

Abbreviations

SSRS:

Spine stereotactic radiosurgery

ESCC:

Epidural Spinal Cord Scale

EBRT:

External beam radiation therapy

SINS:

Spinal Instability Neoplastic Score

KPS:

Karnofsky Performance Score

OS:

Overall survival

LC:

Local control

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In this manuscript, S.T., S.A., R.S., S.B., J.F., P.Z., P.G., designed the study. Material preparation, data collection, and analysis were performed by S.T., S.A., A.T., A.R.. The first draft of the manuscript was written by S.T. and S.A., and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Roberta K. Sefcik.

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Taori, S., Adida, S., Tang, A. et al. The role of spine stereotactic radiosurgery for patients with breast cancer metastases. J Neurooncol 167, 257–266 (2024). https://doi.org/10.1007/s11060-024-04599-1

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