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Roy H. Decker and Lynn D. Wilson

The role of radiotherapy in treating local and regional disease in patients with clinically localized Merkel cell carcinoma remains controversial. Given the lack of randomized evidence and patient and treatment heterogeneity in published retrospective series, sound clinical judgment is required to assess individual patient risk factors. Although many single-institution series have shown that adjuvant radiation to the primary tumor site decreases the risk for local and regional failure, evidence is emerging that there is a cohort of patients at relatively low risk for local recurrence after wide local excision alone. Node dissection, radiotherapy, and combined modality treatment may all play a role in managing occult or clinically evident nodal disease, depending on the anatomic location of draining lymphatics and the extent of microscopic or macroscopic disease. For select patients, primary radiotherapy is a reasonable option with a low risk for local or regional recurrence.

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Christopher K. Bichakjian, Thomas Olencki, Sumaira Z. Aasi, Murad Alam, James S. Andersen, Rachel Blitzblau, Glen M. Bowen, Carlo M. Contreras, Gregory A. Daniels, Roy Decker, Jeffrey M. Farma, Kris Fisher, Brian Gastman, Karthik Ghosh, Roy C. Grekin, Kenneth Grossman, Alan L. Ho, Karl D. Lewis, Manisha Loss, Daniel D. Lydiatt, Jane Messina, Kishwer S. Nehal, Paul Nghiem, Igor Puzanov, Chrysalyne D. Schmults, Ashok R. Shaha, Valencia Thomas, Yaohui G. Xu, John A. Zic, Karin G. Hoffmann, and Anita M. Engh

This selection from the NCCN Guidelines for Merkel Cell Carcinoma (MCC) focuses on areas impacted by recently emerging data, including sections describing MCC risk factors, diagnosis, workup, follow-up, and management of advanced disease with radiation and systemic therapy. Included in these sections are discussion of the new recommendations for use of Merkel cell polyomavirus as a biomarker and new recommendations for use of checkpoint immunotherapies to treat metastatic or unresectable disease. The next update of the complete version of the NCCN Guidelines for MCC will include more detailed information about elements of pathology and addresses additional aspects of management of MCC, including surgical management of the primary tumor and draining nodal basin, radiation therapy as primary treatment, and management of recurrence.

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Gregory P. Kalemkerian, Billy W. Loo Jr, Wallace Akerley, Albert Attia, Michael Bassetti, Yanis Boumber, Roy Decker, M. Chris Dobelbower, Afshin Dowlati, Robert J. Downey, Charles Florsheim, Apar Kishor P. Ganti, John C. Grecula, Matthew A. Gubens, Christine L. Hann, James A. Hayman, Rebecca Suk Heist, Marianna Koczywas, Robert E. Merritt, Nisha Mohindra, Julian Molina, Cesar A. Moran, Daniel Morgensztern, Saraswati Pokharel, David C. Portnoy, Deborah Rhodes, Chad Rusthoven, Jacob Sands, Rafael Santana-Davila, Charles C. Williams Jr, Karin G. Hoffmann, and Miranda Hughes

The NCCN Guidelines for Small Cell Lung Cancer (SCLC) address all aspects of disease management. These NCCN Guidelines Insights focus on recent updates to the NCCN Guidelines for SCLC regarding immunotherapy, systemic therapy, and radiation therapy. For the 2018 update, new sections were added on “Signs and Symptoms of SCLC” and “Principles of Pathologic Review.”