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Clinical Trial Summary

This protocol seeks to utilize a novel method of tumor bed boost delivery and to better understand breast cancer radiation response through the analysis of pre-and post-radiation breast tumor samples.

Clinical Trial Description

The study team proposes in this trial to build on the favorable results of the intraoperative boost trials but using a preoperative delivery approach. The PI has demonstrated the feasibility of the preoperative approach and successfully completed a Phase I dose-finding partial breast trial. The preoperative approach has several advantages: 1) expensive intra-operative equipment is unnecessary, 2) a small intact breast tumor results in significantly less uninvolved breast tissue receiving high radiation doses which likely decreases toxicity; 3) more accurate targeting of the high-risk areas of subclinical disease surrounding the tumor is possible, 4) smaller treatment volumes are amenable to dose escalation which can further accelerate treatment and improve accessibility for subjects, and 5) the pre-operative approach provides a novel opportunity to study breast cancer radiation response. Radiotherapy to the intact tumor is a relatively rare event in breast cancer irradiation, particularly in the setting of early stage breast cancer. Tumor and normal tissue radiation response remain relatively poorly understood. Markers capable of predicting radiation response are rare indeed. Therefore, paired pre- and post-radiation tissue will be examined for FAS gene expression and compared among the breast cancer subtypes. FAS is the name of a gene ( not an acronym) that is known to play a critical role in the induction of programmed cell death and is an established prognostic marker in breast cancer. Previous study team findings that FAS induction appears to be breast cancer subtype-specific has not been previously observed and provides a possible explanation for the differential rates of tumor response observed clinically in distinct breast tumor subtypes. The study team's preclinical work with FAS suggests a potential role as a radiation response biomarker. The study goal is to validate those findings in this large cohort of diverse breast cancer subjects. However, because preoperative delivery of the boost to the intact tumor is unique, this study will include a secondary cosmetic outcome that includes predefined stopping boundaries for early indications of suboptimal cosmetic outcomes with this novel approach ;

Study Design

Related Conditions & MeSH terms

NCT number NCT02482389
Study type Interventional
Source Duke University
Status Terminated
Phase N/A
Start date September 8, 2015
Completion date June 25, 2021

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