Small bowel adenocarcinoma (SBA) is a rare cancer that has been treated similarly to colorectal cancer (CRC) in the advanced setting. Incidence has been increasing as detection efforts have been improving for these challenging-to-diagnose tumors, but patients frequently experience prolonged nonspecific symptoms due to delayed diagnosis. As a result of such delays and likely due to variant biology, patient outcomes for SBA are inferior to those for CRC at all stages of diagnosis. Recent molecular studies highlight the genomic differences underpinning these tumors and suggest new future pathways for treatment, distinct from CRC.
Katrina S. Pedersen, Kanwal Raghav and Michael J. Overman
Al B. Benson III, Alan P. Venook, Mahmoud M. Al-Hawary, Mustafa A. Arain, Yi-Jen Chen, Kristen K. Ciombor, Stacey A. Cohen, Harry S. Cooper, Dustin A. Deming, Ignacio Garrido-Laguna, Jean L. Grem, Sarah E. Hoffe, Joleen Hubbard, Steven Hunt, Ahmed Kamel, Natalie Kirilcuk, Smitha Krishnamurthi, Wells A. Messersmith, Jeffrey Meyerhardt, Eric D. Miller, Mary F. Mulcahy, Steven Nurkin, Michael J. Overman, Aparna Parikh, Hitendra Patel, Katrina S. Pedersen, Leonard B. Saltz, Charles Schneider, David Shibata, John M. Skibber, Constantinos T. Sofocleous, Elena M. Stoffel, Eden Stotsky-Himelfarb, Christopher G. Willett, Alyse Johnson-Chilla, Kristina M. Gregory and Lisa A. Gurski
Small bowel adenocarcinoma (SBA) is a rare malignancy of the gastrointestinal tract that has increased in incidence across recent years. Often diagnosed at an advanced stage, outcomes for SBA are worse on average than for other related malignancies, including colorectal cancer. Due to the rarity of this disease, few studies have been done to direct optimal treatment, although recent data have shown that SBA responds to treatment differently than colorectal cancer, necessitating a separate approach to treatment. The NCCN Guidelines for Small Bowel Adenocarcinoma were created to establish an evidence-based standard of care for patients with SBA. These guidelines provide recommendations on the workup of suspected SBA, primary treatment options, adjuvant treatment, surveillance, and systemic therapy for metastatic disease. Additionally, principles of imaging and endoscopy, pathologic review, surgery, radiation therapy, and survivorship are described.