Vedolizumab is a novel monoclonal antibody drug that selectively blocks the interaction between integrin α4β7 and mucosal addressin cell adhesion molecule-1 (MAdCAM-1), thereby inhibiting lymphocyte entry into intestinal tissue and reducing intestinal inflammation. Since only lymphocytes with integrin α4β7 on their surface can travel to intestinal tissue, the drug does not affect the immune function and inflammatory response of other tissues and organs[1–3]. Therefore, Vedolizumab has a high safety profile in the treatment of ulcerative colitis and Crohn's disease, but its therapeutic efficacy varies among individuals[4].
Inflammatory Bowel Disease (IBD) is a group of diseases characterized by chronic inflammation of the intestines, including Ulcerative Colitis (UC) and Crohn's Disease (CD). The etiology of the disease is not yet fully understood, but it is known that genetic factors, environmental factors, and immune system abnormalities may all contribute to its development[5, 6]. The clinical manifestations of IBD vary due to individual differences, with common symptoms including abdominal pain, diarrhea, constipation, anemia, and weight loss. The incidence and epidemiological characteristics of the disease also vary depending on geographical region, race, age, and other factors[7, 8]. Currently, a variety of approaches are used for comprehensive and individualized treatment of IBD, including medication, surgery, and nutritional support[9].
Drugs used to treat inflammatory bowel disease (IBD) primarily include 5-aminosalicylic acid drugs, immunosuppressants, biologics, and steroids. However, each drug has its limitations in treatment. For example, although steroid hormones have a significant effect on treating IBD, the biggest limitations are drug tolerance and dependence. Long-term use can lead to osteoporosis, diabetes, infection, and other complications[10]. The use of immunosuppressants to treat IBD can also inhibit the immune system, increasing the risk of infection[11, 12].
Nasopharyngitis refers to chronic inflammation of the nasal and pharyngeal mucosa, which is typically caused by bacteria, viruses, allergens, and other factors. In many clinical trials assessing the safety of vedolizumab, it has been observed that nasopharyngitis is a relatively common adverse event. Given the increasing focus on respiratory infections due to the COVID-19 pandemic and the growing use of vedolizumab. The aim of this study is to evaluate whether there is a correlation between the use of vedolizumab and the incidence of nasopharyngitis during treatment, and to compare the effects of different formulations on the incidence of nasopharyngitis.