Synchronous Pulmonary Adenocarcinomas

American Journal of Clinical Pathology
Carlos A PaganAnjali Saqi

Abstract

To determine concordance/discordance between morphology and molecular testing (MT) among synchronous pulmonary carcinomas using targeted next generation sequencing (NGS), with and without comprehensive molecular review (CMR), vs analyses of multiple singe genes (non-NGS). Results of morphologic and MT assessment were classified as concordant, discordant, or indeterminate. For discordant cases, comprehensive histologic assessment (CHA) was performed. Forty-seven cases with 108 synchronous tumors were identified and underwent MT (NGS, n = 23 and non-NGS, n = 24). Histology and MT were concordant, discordant, and indeterminate in 53% (25/47), 21% (10/47), and 26% (12/47) of cases, respectively. CHA of the 10 discordant cases revised results of three cases. There is discordance between histology and MT in a subset of cases and MT provides an objective surrogate for staging synchronous tumors. A limited gene panel is sufficient for objectively assessing a relationship if the driver mutations are distinct. Relatedness of mutations require CMR with a larger NGS panel (eg, 50 genes).

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Citations

Apr 12, 2021·Journal of Thoracic Oncology : Official Publication of the International Association for the Study of Lung Cancer·Soo-Ryum YangNatasha Rekhtman
Jul 12, 2021·Clinical Lung Cancer·Edward T CareyJoshua K Sabari

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