NTRK gene fusions are found in <1% of all cancers but are uniformly present in mammary analog secretory carcinomas (MASC) of the salivary glands. Two selective histology-agnostic tropomyosin receptor kinase (TRK) inhibitors are currently approved for malignancies with these oncogenic fusions. Resistance to TRK inhibition has been recognized, and the mediating mechanisms are presently being studied. This report describes a patient diagnosed with an MASC of the parotid gland who after undergoing multiple lines of treatment was found to have an ETV6-NTRK3 fusion and initiated TRK-targeted therapy using entrectinib. Upon disease progression, we performed tumor genetic sequencing that showed a secondary resistance mutation. The patient subsequently responded to selitrectinib, a next-generation TRK inhibitor.
Vaia Florou, Christopher Nevala-Plagemann, Jonathan Whisenant, Patricia Maeda, Glynn W. Gilcrease, and Ignacio Garrido-Laguna
Manisha H. Shah, Whitney S. Goldner, Thorvardur R. Halfdanarson, Emily Bergsland, Jordan D. Berlin, Daniel Halperin, Jennifer Chan, Matthew H. Kulke, Al B. Benson III, Lawrence S. Blaszkowsky, Jennifer Eads, Paul F. Engstrom, Paul Fanta, Thomas Giordano, Jin He, Martin J. Heslin, Gregory P. Kalemkerian, Fouad Kandeel, Sajid A. Khan, Wajih Zaheer Kidwai, Pamela L. Kunz, Boris W. Kuvshinoff II, Christopher Lieu, Venu G. Pillarisetty, Leonard Saltz, Julie Ann Sosa, Jonathan R. Strosberg, Craig A. Sussman, Nikolaos A. Trikalinos, Nataliya A. Uboha, Jonathan Whisenant, Terence Wong, James C. Yao, Jennifer L. Burns, Ndiya Ogba, and Griselda Zuccarino-Catania
The NCCN Guidelines for Neuroendocrine and Adrenal Tumors provide recommendations for the management of adult patients with neuroendocrine tumors (NETs), adrenal gland tumors, pheochromocytomas, and paragangliomas. Management of NETs relies heavily on the site of the primary NET. These NCCN Guidelines Insights summarize the management options and the 2018 updates to the guidelines for locoregional advanced disease, and/or distant metastasis originating from gastrointestinal tract, bronchopulmonary, and thymus primary NETs.