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Poster display session

528P - High-biologically effective dose radiotherapy may improve local control of small cell lung cancer patients with brain metastases: A propensity-matching analysis

Date

23 Nov 2019

Session

Poster display session

Topics

Tumour Site

Small Cell Lung Cancer

Presenters

Qingyang Zhuang

Citation

Annals of Oncology (2019) 30 (suppl_9): ix157-ix181. 10.1093/annonc/mdz437

Authors

Q. Zhuang1, F. Lin1, X. Lin1, J. Li2, W. Junxin1

Author affiliations

  • 1 Radiation Oncology, Fujian Medical University Cancer Hospital, 350014 - Fuzhou/CN
  • 2 Radiotherapy, The First Affiliated Hospital of Xiamen University, 361003 - Xiamen/CN

Resources

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Abstract 528P

Background

To compare the effects of high biologically effective dose (BED) and low BED radiotherapy for small cell lung cancer (SCLC) with brain metastases (BMs), and identify the prognostic factors of survival.

Methods

A total of 250 consecutive limited-stage (LC) SCLC with BMs patients in our institution were retrospectively analyzed, from January 1998 to June 2018. Preliminary screening of the prognostic factors was accomplished by Kaplan-Meier univariate analysis. Baseline covariates were balanced by a propensity-matching analysis. And survival curves between two groups were compared by log-rank test. The Cox regression model was used to analyze factors associated with prognosis.

Results

The Cutoff Finder program exported an optimal BED cutoff value of 47 for all patients. The high-BED (>47 Gy) group had a significantly better brain metastases progression-free survival (BMPFS) than low-BED (≤47 Gy) group (median BMPFS: 14.4 vs. 8.3, P < 0.001). Multivariate analysis found that BED, smoking and age (P < 0.001) were independently prognostic factors affecting BMPFS. And after 1:2 propensity score matching, 176 patients were divided into the high-BED group (n = 59) and the low-BED group (n = 117). In the matched cohort, BMPFS was significantly higher in the high-BED group than low-BED group (P < 0.001).

Conclusions

BED, smoking and age were observed to affect BMPFS of SCLC patients with BMs. High BED radiotherapy (>47 Gy) might improve local control. Additional study is warranted.

Clinical trial identification

Editorial acknowledgement

Legal entity responsible for the study

The authors.

Funding

Has not received any funding.

Disclosure

All authors have declared no conflicts of interest.

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