• Allison Reichl, Ryan Schutt, John Walsh, James Prieto, Alicia G Sykes, Stephen Bickler, and Romeo Ignacio.
• Department of Surgery, University of California San Diego School of Medicine, La Jolla, CA 92093, USA.
• Mil Med. 2022 Jan 4; 187 (1-2): e76-e81.

IntroductionFor over 30 years, the USNS Mercy hospital ship has provided surgical care on multiple humanitarian aid and disaster relief missions. During these missions, surgical support varies according to host nation needs, and the operative treatment of cancer patients remains controversial. We report the number of incidentally discovered surgical oncologic cases treated aboard the USNS Mercy on four missions and discuss challenges regarding oncologic care on these missions.Materials And MethodsBetween 2008 and 2016, operative cases and surgical pathology results from four multinational humanitarian missions were analyzed according to organ system, patient's geographic location, and diagnosis. Primary outcomes were total number and proportion of malignant cases, analyzed yearly and over all four missions. Secondary outcomes were malignant diagnoses by organ system and host nation health capacities (based on indicators from the WHO).ResultsA total of 2,767 operations were performed during 18 port visits in 8 countries in Southeast Asia. In total, 1,193 pathology specimens (surgical biopsies, fine needle aspirations, etc.) were obtained. Overall malignancy rate across all organ systems was 9%. Yearly malignancy rates ranged from 2% to 13%. The highest malignancy rates were found in thyroid (33%), breast (20%), and parotid and salivary gland cases (19%). All host nations had operational strategies for cancer in place (n = 8, 100%), but few had national infrastructures to treat noncommunicable diseases (n = 2, 25%).ConclusionsDespite current policies to screen out cancer patients on USNS Mercy missions, 9% of surgical biopsies were malignant. Cancer management during these missions presents a unique challenge because of limited resources for surgery, chemoradiotherapy, and follow-up care. Contingency plans must be considered to provide completion of care for these patients whose cancers are discovered incidentally. Furthermore, an understanding of host nation capabilities in relation to medical and surgical care is crucial to providing treatment in resource-limited areas.© The Association of Military Surgeons of the United States 2020. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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