Diabetic Ketoacidosis as the Initial Presenting Symptom of Pancreatic Cancer: A Comprehensive Review.

Recent studies have indicated that diabetic ketoacidosis (DKA) can be the primary presenting symptom of pancreatic cancer. This comprehensive review assesses the existing research on the incidence of DKA as an initial symptom of pancreatic cancer, including its clinical characteristics, diagnostic challenges, and implications for treatment and prognosis. A comprehensive search was conducted across four electronic databases (PubMed, Scopus, Web of Science, and Cochrane), complemented by a manual search. The search criteria focused on original case reports of pancreatic cancer patients who presented with DKA. Among the 360 studies reviewed, 9 met the eligibility criteria. Among the cases, pancreatic adenocarcinoma was the most common type, followed by somatostatinoma and cystadenocarcinoma. Diagnostic modalities included computed tomography, ultrasound, biopsy, and endoscopic ultrasound. Elevated tumor markers such as CA19-9 were reported in several cases. Most patients presented with gastrointestinal and neurological symptoms, with high levels of glucose and ketone bodies. This review highlights that DKA can serve as a rare but significant initial presentation of pancreatic cancer. Identifying this association is critical for facilitating early diagnosis, which may improve the otherwise poor prognosis of pancreatic cancer. Our findings suggest that clinicians should maintain a high index of suspicion for pancreatic malignancy in patients presenting with unexplained DKA, particularly those without traditional risk factors or precipitating events. Early imaging and multidisciplinary evaluation are essential in such cases.