Waltenberger, M.* ; Bernhardt, D.* ; Diehl, C.* ; Gempt, J.* ; Meyer, B.* ; Straube, C.* ; Wiestler, B.* ; Wilkens, J.* ; Zimmer, C.* ; Combs, S.E.
     
    
        
Hypofractionated stereotactic radiotherapy (HFSRT) versus single fraction stereotactic radiosurgery (SRS) to the resection cavity of brain metastases after surgical resection (SATURNUS): Study protocol for a randomized phase III trial.
    
    
        
    
    
        
        BMC Cancer 23:709 (2023)
    
    
    
      
      
	
	    BACKGROUND: The brain is a common site for cancer metastases. In case of large and/or symptomatic brain metastases, neurosurgical resection is performed. Adjuvant radiotherapy is a standard procedure to minimize the risk of local recurrence and is increasingly performed as local stereotactic radiotherapy to the resection cavity. Both hypofractionated stereotactic radiotherapy (HFSRT) and single fraction stereotactic radiosurgery (SRS) can be applied in this case. Although adjuvant stereotactic radiotherapy to the resection cavity is widely used in clinical routine and recommended in international guidelines, the optimal fractionation scheme still remains unclear. The SATURNUS trial prospectively compares adjuvant HFSRT with SRS and seeks to detect the superiority of HFSRT over SRS in terms of local tumor control. METHODS: In this single center two-armed randomized phase III trial, adjuvant radiotherapy to the resection cavity of brain metastases with HFSRT (6 - 7 × 5 Gy prescribed to the surrounding isodose) is compared to SRS (1 × 12-20 Gy prescribed to the surrounding isodose). Patients are randomized 1:1 into the two different treatment arms. The primary endpoint of the trial is local control at the resected site at 12 months. The trial is based on the hypothesis that HFSRT is superior to SRS in terms of local tumor control. DISCUSSION: Although adjuvant stereotactic radiotherapy after resection of brain metastases is considered standard of care treatment, there is a need for further prospective research to determine the optimal fractionation scheme. To the best of our knowledge, the SATURNUS study is the only randomized phase III study comparing different regimes of postoperative stereotactic radiotherapy to the resection cavity adequately powered to detect the superiority of HFSRT regarding local control. TRIAL REGISTRATION: The study was retrospectively registered with ClinicalTrials.gov, number NCT05160818, on December 16, 2021. The trial registry record is available on  https://clinicaltrials.gov/study/NCT05160818 . The presented protocol refers to version V1.3 from March 21, 2021.
	
	
	    
	
       
      
	
	    
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        Publication type
        Article: Journal article
    
 
    
        Document type
        Scientific Article
    
 
    
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        Keywords
        Brain Metastases ; Clinical Trial ; Local Control ; Radiosurgery ; Randomized Trial ; Resection Cavity ; Stereotactic Radiotherapy; Multicenter; Failure
    
 
    
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        Language
        english
    
 
    
        Publication Year
        2023
    
 
    
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        HGF-reported in Year
        2023
    
 
    
    
        ISSN (print) / ISBN
        1471-2407
    
 
    
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        1471-2407
    
 
    
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	    Volume: 23,  
	    Issue: 1,  
	    Pages: ,  
	    Article Number: 709 
	    Supplement: ,  
	
    
 
    
        
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            BioMed Central
        
 
        
            Publishing Place
            Campus, 4 Crinan St, London N1 9xw, England
        
 
	
        
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        Reviewing status
        Peer reviewed
    
 
     
    
        POF-Topic(s)
        30203 - Molecular Targets and Therapies
    
 
    
        Research field(s)
        Radiation Sciences
    
 
    
        PSP Element(s)
        G-501300-001
    
 
    
        Grants
        SATURNUS trial
Comprehensive Cancer Center Munich (CCC-M)
Projekt DEAL
    
 
    
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        Erfassungsdatum
        2023-10-06