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A Case of Microsatellite Instability–High Colon Cancer in a Young Woman With Familial Adenomatous Polyposis

Steven M. Blum, William R. Jeck, Lindsay Kipnis, Ronald Bleday, Jonathan A. Nowak, and Matthew B. Yurgelun

Two major molecular pathways of colorectal carcinogenesis, chromosomal instability (CIN) and microsatellite instability (MSI), are considered to be mutually exclusive. Distinguishing CIN from MSI-high tumors has considerable therapeutic implications, because patients with MSI-high tumors can derive considerable benefit from immune checkpoint inhibitors, and tumors that evolved through the CIN pathway do not respond to these agents. Familial adenomatous polyposis (FAP) is a genetic syndrome that is defined by a mutation in the APC gene and is thought to lead to carcinogenesis through the CIN pathway. Here, we report a case of a young woman with FAP who was treated for medulloblastoma as a child and developed advanced MSI-high colon cancer as a young adult. Her response to second-line immunotherapy enabled resection of her colon cancer, and she is free of disease >10 months after surgery. This case highlights the potential for overlap between the CIN and MSI carcinogenic pathways and associated therapeutic implications.

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Rectal Cancer, Version 2.2022, NCCN Clinical Practice Guidelines in Oncology

Al B. Benson III, Alan P. Venook, Mahmoud M. Al-Hawary, Nilofer Azad, Yi-Jen Chen, Kristen K. Ciombor, Stacey Cohen, Harry S. Cooper, Dustin Deming, Ignacio Garrido-Laguna, Jean L. Grem, Andrew Gunn, J. Randolph Hecht, Sarah Hoffe, Joleen Hubbard, Steven Hunt, William Jeck, Kimberly L. Johung, Natalie Kirilcuk, Smitha Krishnamurthi, Jennifer K. Maratt, Wells A. Messersmith, Jeffrey Meyerhardt, Eric D. Miller, Mary F. Mulcahy, Steven Nurkin, Michael J. Overman, Aparna Parikh, Hitendra Patel, Katrina Pedersen, Leonard Saltz, Charles Schneider, David Shibata, John M. Skibber, Constantinos T. Sofocleous, Eden Stotsky-Himelfarb, Anna Tavakkoli, Christopher G. Willett, Kristina Gregory, and Lisa Gurski

This selection from the NCCN Guidelines for Rectal Cancer focuses on management of malignant polyps and resectable nonmetastatic rectal cancer because important updates have been made to these guidelines. These recent updates include redrawing the algorithms for stage II and III disease to reflect new data supporting the increasingly prominent role of total neoadjuvant therapy, expanded recommendations for short-course radiation therapy techniques, and new recommendations for a “watch-and-wait” nonoperative management technique for patients with cancer that shows a complete response to neoadjuvant therapy. The complete version of the NCCN Guidelines for Rectal Cancer, available online at NCCN.org, covers additional topics including risk assessment, pathology and staging, management of metastatic disease, posttreatment surveillance, treatment of recurrent disease, and survivorship.

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Anal Carcinoma, Version 2.2023, NCCN Clinical Practice Guidelines in Oncology

Al B. Benson III, Alan P. Venook, Mahmoud M. Al-Hawary, Nilofer Azad, Yi-Jen Chen, Kristen K. Ciombor, Stacey Cohen, Harry S. Cooper, Dustin Deming, Ignacio Garrido-Laguna, Jean L. Grem, J. Randolph Hecht, Sarah Hoffe, Joleen Hubbard, Steven Hunt, Hisham Hussan, William Jeck, Kimberly L. Johung, Nora Joseph, Natalie Kirilcuk, Smitha Krishnamurthi, Jennifer Maratt, Wells A. Messersmith, Jeffrey Meyerhardt, Eric D. Miller, Mary F. Mulcahy, Steven Nurkin, Michael J. Overman, Aparna Parikh, Hitendra Patel, Katrina Pedersen, Leonard Saltz, Charles Schneider, David Shibata, John M. Skibber, Constantinos T. Sofocleous, Eden Stotsky-Himelfarb, Anna Tavakkoli, Christopher G. Willett, Grant Williams, Frankie Algieri, Lisa Gurski, and Katie Stehman

This discussion summarizes the NCCN Clinical Practice Guidelines for managing squamous cell anal carcinoma, which represents the most common histologic form of the disease. A multidisciplinary approach including physicians from gastroenterology, medical oncology, surgical oncology, radiation oncology, and radiology is necessary. Primary treatment of perianal cancer and anal canal cancer are similar and include chemoradiation in most cases. Follow-up clinical evaluations are recommended for all patients with anal carcinoma because additional curative-intent treatment is possible. Biopsy-proven evidence of locally recurrent or persistent disease after primary treatment may require surgical treatment. Systemic therapy is generally recommended for extrapelvic metastatic disease. Recent updates to the NCCN Guidelines for Anal Carcinoma include staging classification updates based on the 9th edition of the AJCC Staging System and updates to the systemic therapy recommendations based on new data that better define optimal treatment of patients with metastatic anal carcinoma.