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01.12.2018 | Research | Ausgabe 1/2018 Open Access

Radiation Oncology 1/2018

Adoption of prophylactic cranial irradiation (PCI) for extensive stage small cell lung cancer (ES-SCLC): a population based outcome study

Zeitschrift:
Radiation Oncology > Ausgabe 1/2018
Autoren:
Yu Yang Soon, Huili Zheng, Shaun Zhirui Ho, Wee Yao Koh, Cheng Nang Leong, Jeremy Chee Seong Tey, Balamurugan Vellayappan, Swee Peng Yap, Ivan Weng Keong Tham, Kam Weng Fong
Wichtige Hinweise
Yu Yang Soon, Huili Zheng and Shaun Zhirui Ho contributed equally to this work.

Abstract

Background

The survival benefit of PCI in ES-SCLC reported by a European randomized trial (RCT) in 2007 was not replicated by a Japanese RCT published in 2017. This study aimed to evaluate the uptake of PCI before and after publication of the European RCT and its association with survival in ES-SCLC.

Methods

We identified eligible patients in the only two Singapore national cancer centres from 2003 to 2010. We linked their electronic medical records to the national death registry. We described the utilization of PCI in patients diagnosed from 2003 to 2006 (pre-adoption cohort) with patients diagnosed from 2007 to 2010 (post-adoption cohort). We performed univariable and multivariable Cox regression analysis to assess the association between PCI and survival.

Results

We identified 224 patients with ES-SCLC with no brain metastases. Among the 71 patients who had at least stable disease after first line chemotherapy, there was an increase in the use of PCI from the period 2007 to 2010 compared with 2003 to 2006 (32% versus 10%, P = 0.044). PCI was associated with improved OS (hazard ratio 0.22, 95% CI 0.10 to 0.47, P < 0.001) compared to no PCI in the multivariable analysis.

Conclusion

There was an increase in the adoption of PCI for ES-SCLC since 2007. PCI was associated with improved survival in patients who did not have mandatory MRI brain imaging prior to PCI and had stable disease or better after first line chemotherapy, suggesting that the results of the European RCT are reproducible in the real-world practice.
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