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Stanley J. Miller, Murad Alam, James Andersen, Daniel Berg, Christopher K. Bichakjian, Glen Bowen, Richard T. Cheney, L. Frank Glass, Roy C. Grekin, Dennis E. Hallahan, Anne Kessinger, Nancy Y. Lee, Nanette Liegeois, Daniel D. Lydiatt, Jeff Michalski, William H. Morrison, Kishwer S. Nehal, Kelly C. Nelson, Paul Nghiem, Thomas Olencki, Allan R. Oseroff, Clifford S. Perlis, E. William Rosenberg, Ashok R. Shaha, Marshall M. Urist and Linda C. Wang

Merkel Cell Carcinoma Clinical Practice Guidelines in Oncology NCCN Categories of Evidence and Consensus Category 1: The recommendation is based on high-level evidence (e.g., randomized controlled trials) and there is uniform NCCN consensus. Category 2A: The recommendation is based on lower-level evidence and there is uniform NCCN consensus. Category 2B: The recommendation is based on lower-level evidence and there is nonuniform NCCN consensus (but no major disagreement). Category 3: The recommendation is based on any level of evidence but reflects major disagreement. All recommendations are category 2A unless otherwise noted. Clinical trials: The NCCN believes that the best management for any cancer patient is in a clinical trial. Participation in clinical trials is especially encouraged. Overview Merkel cell carcinoma (MCC) is a rare, aggressive cutaneous tumor that combines the local recurrence rates of infiltrative non-melanoma skin cancer along with the regional and distant metastatic rates of thick melanoma.1–16 Several large reviews document the development of local recurrence in 25% to 30% of all cases of MCC, regional disease in 52% to 59%, and distant metastatic disease in 34% to 36%.1,16,17 MCC has a mortality rate that exceeds that of melanoma;18 overall 5-year survival rates range from 30% to 64%.3,19 A history of extensive sun exposure is a risk factor for MCC. Older white men (≥ 65 years) are at higher risk for MCC, which tends to occur on the areas of the skin that are exposed to sun.20 The NCCN Non-Melanoma Skin Cancer Panel has developed guidelines outlining treatment of...
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Stanley J. Miller, Murad Alam, James Andersen, Daniel Berg, Christopher K. Bichakjian, Glen Bowen, Richard T. Cheney, L. Frank Glass, Roy C. Grekin, Anne Kessinger, Nancy Y. Lee, Nanette Liegeois, Daniel D. Lydiatt, Jeff Michalski, William H. Morrison, Kishwer S. Nehal, Kelly C. Nelson, Paul Nghiem, Thomas Olencki, Clifford S. Perlis, E. William Rosenberg, Ashok R. Shaha, Marshall M. Urist, Linda C. Wang and John A. Zic

Overview Basal and squamous cell skin cancers, collectively known as non-melanoma skin cancers (NMSC), are the most common skin cancers.1,2 More than 1 million cases of NMSC are estimated to be diagnosed each year in the United States and their incidence is rising rapidly.3,4 Basal cell carcinomas are approximately 4 to 5 times more common than squamous cell carcinomas. Although rarely metastatic, basal and squamous cell cancers can produce substantial local destruction along with disfigurement, and may involve extensive areas of soft tissue, cartilage, and bone. The estimated annual cost of treating these 2 diseases in the United States Medicare population exceeds $400 million.5 However, NMSCs generally have a good prognosis. The most significant environmental carcinogen for NMSC is sunlight.6 Thus, individuals in Hawaii are at much greater risk than those in the northern parts of the United States. Fair-skinned individuals who have received too much sun exposure are at the greatest risk for these cancers. Most of these tumors develop on sun-exposed skin sites. The most common sites are on the head and neck area. According to a report from the Childhood Cancer Survivor Study, long-term survivors of childhood and adolescent cancers who have undergone prior radiation therapy are also at risk for developing NMSC.7 Actinic keratoses are sun-induced precancerous lesions.8,9 Bowen's disease is characterized by squamous cell carcinoma in situ lesions that occur predominantly in older persons.10 Both types of lesions, if untreated, can progress to invasive squamous cell carcinoma with the potential for metastasis. Skin cancer preventive...
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Stanley J. Miller, Murad Alam, James S. Andersen, Daniel Berg, Christopher K. Bichakjian, Glen M. Bowen, Richard T. Cheney, L. Frank Glass, Roy C. Grekin, Alan L. Ho, Anne Kessinger, Nanette Liegeois, Daniel D. Lydiatt, Jeff Michalski, William H. Morrison, Kishwer S. Nehal, Kelly C. Nelson, Paul Nghiem, Thomas Olencki, Clifford S. Perlis, Ashok R. Shaha, Malika Tuli, Marshall M. Urist, Linda C. Wang and John A. Zic

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Christopher K. Bichakjian, Thomas Olencki, Murad Alam, James S. Andersen, Daniel Berg, Glen M. Bowen, Richard T. Cheney, Gregory A. Daniels, L. Frank Glass, Roy C. Grekin, Kenneth Grossman, Alan L. Ho, Karl D. Lewis, Daniel D. Lydiatt, William H. Morrison, Kishwer S. Nehal, Kelly C. Nelson, Paul Nghiem, Clifford S. Perlis, Ashok R. Shaha, Wade L. Thorstad, Malika Tuli, Marshall M. Urist, Timothy S. Wang, Andrew E. Werchniak, Sandra L. Wong, John A. Zic, Nicole McMillian, Karin Hoffman and Maria Ho

Dermatofibrosarcoma protuberans (DFSP) is an uncommon soft tissue tumor characterized by a relatively high risk of local recurrence and low risk of metastasis. The NCCN Guidelines for DFSP provide multidisciplinary recommendations on the management of patients with this rare disease. These NCCN Guidelines Insights highlight the addition of the Principles of Pathology section, which provides recommendations on the pathologic assessment of DFSP. Because DFSP can mimic other lesions, immunohistochemical studies are often required to establish diagnosis. Cytogenetic testing for the characteristic translocation t(17;22)(q22;q13) can also be valuable in the differential diagnosis of DFSP with other histologically similar tumors.

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Christopher K. Bichakjian, Thomas Olencki, Sumaira Z. Aasi, Murad Alam, James S. Andersen, Daniel Berg, Glen M. Bowen, Richard T. Cheney, Gregory A. Daniels, L. Frank Glass, Roy C. Grekin, Kenneth Grossman, Susan A. Higgins, Alan L. Ho, Karl D. Lewis, Daniel D. Lydiatt, Kishwer S. Nehal, Paul Nghiem, Elise A. Olsen, Chrysalyne D. Schmults, Aleksandar Sekulic, Ashok R. Shaha, Wade L. Thorstad, Malika Tuli, Marshall M. Urist, Timothy S. Wang, Sandra L. Wong, John A. Zic, Karin G. Hoffmann and Anita Engh

Basal cell carcinoma (BCC) of the skin is the most common cancer, with a higher incidence than all other malignancies combined. Although it is rare to metastasize, patients with multiple or frequently recurring BCC can suffer substantial comorbidity and be difficult to manage. Assessment of risk is a key element of management needed to inform treatment selection. The overall management of BCC primarily consists of surgical approaches, with radiation therapy as an alternate or adjuvant option. Many superficial therapies for BCC have been explored and continue to be developed, including topicals, cryosurgery, and photodynamic therapy. Two hedgehog pathway inhibitors were recently approved by the FDA for systemic treatment of advanced and metastatic BCC, and others are in development. The NCCN Guidelines for Basal Cell Skin Cancer, published in full herein, include recommendations for selecting among the various surgical approaches based on patient-, lesion-, and disease-specific factors, as well as guidance on when to use radiation therapy, superficial therapies, and hedgehog pathway inhibitors.

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Christopher K. Bichakjian, Thomas Olencki, Murad Alam, James S. Andersen, Daniel Berg, Glen M. Bowen, Richard T. Cheney, Gregory A. Daniels, L. Frank Glass, Roy C. Grekin, Kenneth Grossman, Alan L. Ho, Karl D. Lewis, Daniel D. Lydiatt, William H. Morrison, Kishwer S. Nehal, Kelly C. Nelson, Paul Nghiem, Clifford S. Perlis, Ashok R. Shaha, Wade L. Thorstad, Malika Tuli, Marshall M. Urist, Timothy S. Wang, Andrew E. Werchniak, Sandra L. Wong, John A. Zic, Karin G. Hoffmann, Nicole R. McMillian and Maria Ho

Merkel cell carcinoma is a rare, aggressive cutaneous tumor that combines the local recurrence rates of infiltrative nonmelanoma skin cancer with the regional and distant metastatic rates of thick melanoma. The NCCN Guidelines for Merkel Cell Carcinoma provide recommendations on the diagnosis and management of this aggressive disease based on clinical evidence and expert consensus. This version includes revisions regarding the use of PET/CT imaging and the addition of a new section on the principles of pathology to provide guidance on the analysis, interpretation, and reporting of pathology results.

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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.