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                                      author：explore   
                                        
                                      
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browse：17
                                  
                                    
          
                                    
            
          
 
          Mark Lennihan/AP
          A young boy died in a trial for Pfizer’s experimental gene therapy for Duchenne muscular dystrophy, the company told patient advocates Tuesday.
          The boy was enrolled in Daylight, a trial studying the treatment in boys aged 2 or 3. The boy had received the therapy early last year, Pfizer told the advocates in a note posted online by Parent Project Muscular Dystrophy.
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          Pfizer said the boy died of cardiac arrest, but that it was still working to understand what happened and the exact cause.
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