Abstract
e15619 Background: Adenocarcinoma in multiple adenomatous polyps (AMAP) is a form of gastrointestinal cancer characterized by adenomatous polyps in the gastrointestinal mucosa and distinct lesions found outside the intestines. A rare form of cancer, AMAP can be traced back to mutations in the APC gene, with higher rates of mutation correlating with worse prognosis. There is an association with familial adenomatous polyposis, which can lead to colorectal cancer in patients as young as 15. Examining demographic statistics on AMAP from the National Cancer Database (NCDB) sheds light on this rare form of colorectal cancer, unlocking new possibilities for diagnostics and treatment. Methods: A retrospective cohort analysis identified 193 patients with AMAP from the 2004-2020 NCDB using ICD-O-3 Code 8221 to identify them. Demographic factors such as age, sex, treatment type, and Charles/Deyo score were explored with descriptive statistics. Linear regression analysis was utilized to study incidence trends. Results: A total of 193 cases of histologically confirmed AMAP were retrieved from the 2004-2020 NCDB with a slight decline in incidence rates during this time (R² = 0.39). The majority of patients were male (55%), White (86%), privately insured (46%), and resided in metropolitan areas with a population size of at least one million (60%). Most patients also comprised the top two income quartiles based on median household income (64%). The mean age at diagnosis was 56.5 years (SD = 19.15, range = 15 - 90). The top primary sites affected were the Colon (26%), Sigmoid Colon (16%), and Rectum (11%). Furthermore, most patients were treated surgically (88%) with the average tumor size of 35.3 mm (SD = 20.5, range = 5.0 - 77.0). More patients received chemotherapy (28%) than radiation therapy (10.4%), with few patients receiving hormone therapy (0.5%) and none receiving immunotherapy. Over half (51%) of the patients were categorized as experiencing Stage 0 and Stage 1 cancer according to the NCDB Analytic Stage Group. The vast majority of patients (74%) had no comorbidities (Charlson-Deyo = 0) and did not receive any palliative care (97%). Conclusions: Our NCDB analysis on AMAP is a novel examination that provides insight into various demographics to better understand the disease. The majority of patients were males with adenocarcinoma lesions most commonly diagnosed in the colon and rectal areas, consistent with previous studies on multiple adenomatous polyps. Our analysis revealed that the majority of patients diagnosed with AMAP tend to be White, privately insured, reside in metropolitan areas, and hail from the top two quartiles of median household income. Additional research is required to gain a greater understanding of the demographic and socioeconomic factors that are important for accurate diagnosis, effective treatments, and improved outcomes.