Orthogonal Testing

AA Adem Albayrak
AG Ana C. Garrido-Castro
MG Marios Giannakis
RU Renato Umeton
MM Monica Devi Manam
ES Elizabeth H. Stover
RP Rebecca L. Porter
BJ Bruce E. Johnson
KL Kai-Li Liaw
MA Mayur Amonkar
AC Alanna J. Church
KJ Katherine A. Janeway
JN Jonathan A. Nowak
LS Lynette Sholl
NL Nancy U. Lin
JJ Jason M. Johnson
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Twelve of the 26 tumor samples with discrepant calls between algorithm and pathologist, specifically those with algorithm-predicted MMR-D, a pathologist call of indeterminate, and sufficient leftover DNA, underwent orthogonal, tumor-only PCR testing. MSI PCR was performed using a five-marker microsatellite panel and capillary electrophoresis as previously described.11 Results were interpreted by the pathologist according to revised Bethesda guidelines.17

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