{"denoms":[{"counts":[{"groupId":"OG000","value":"0"}],"units":"Participants"}],"description":"Presence of EBV DNA in serum.","groups":[{"description":"AJCC Stage IIb - IV","id":"OG000","title":"Stratum II"}],"populationDescription":"Data was and never will be collected.","reportingStatus":"POSTED","timeFrame":"At study enrollment","title":"Predictive Value of Epstein-Barr Virus (EBV) DNA as Measured by Quantitative Detection at Enrollment on EFS 2 Years After Treatment","type":"SECONDARY"}