Immunotherapy with checkpoint inhibitors offers revolutionized malignancy therapy and is now the standard treatment for several different types of malignancy, supported by favorable outcomes and good tolerance. electrolyte-replacement therapy, oral rehydration, and antidiarrheal drugs (e.g. loperamide) [3, 5]. Grade 2 diarrhea is usually of moderate intensity, with four to six stools per day over baseline or a moderate increase in ostomy output [3, 4]. Stool MCS is the only diagnostic workup required at this stage . The treatment of grade 2 diarrhea entails fluid-replacement therapy along with PF 429242 high-dose corticosteroids . Management with corticosteroids, oral prednisolone (1?mg/kg), or intravenous PF 429242 methylprednisolone (1?mg/kg per day) is usually needed if the diarrhea persists for longer than 5?days. Pharmacologic treatment is usually continued until symptoms improve and the patients condition stabilizes . Grades 3 and 4 diarrhea are considered severe. They are defined as seven or more stools per day over baseline, along with fecal incontinence . The patient may present with symptoms such as abdominal pain, rectal bleeding, and mucus in stool . This Tlr4 stage of diarrhea can be life-threatening and could lead to colon perforation . The diagnostic workup includes stool colonoscopy and PF 429242 MCS; the latter is principally indicated if colitis is certainly suspected or if the outward symptoms of diarrhea persist despite corticosteroid treatment . Endoscopy displays inflammatory changessuch as erythema generally, inflammatory exudates, granularity, lack of vascularity, PF 429242 and across the gastrointestinal system ulcerationsanywhere. In the lack of gross adjustments Also, biopsies might present blended inflammatory cell infiltrates within the lamina propria, neutrophilic cryptitis, crypt abscesses, and glandular erosions or destructions from the mucosal surface area; these features overlap with endoscopic results of inflammatory colon disease [6 occasionally, 7]. Of be aware, the amount of diarrhea isn’t connected with endoscopic results. Nevertheless, colonic ulcerations on endoscopy are predictive of steroid-refractory ICI-related colitis . Fecal lactoferrin and fecal calprotectin might help differentiate between an infectious and an inflammatory etiology from the diarrhea/colitis, and will be utilized to monitor disease response and activity to treatment . Levels 3 and 4 diarrhea need hospital entrance and fast initiation of fluid-replacement therapy. In serious diarrhea, corticosteroid treatment with methylprednisolone (1C2?mg/kg each day) ought to be administered intravenously until the patients condition stabilizes [3, 5]. Immunosuppressive brokers such as infliximab are indicated if no improvement is seen with intravenous methylprednisolone [2, 10]. Some case reports and case series of steroid-refractory grades 3 and 4 diarrhea describe the successful and safe use of budesonide, vedolizumab, or aminosalicylates such as mesalamine as second-line immunosuppressive therapy, as well as the use of fecal microbiota transplantation as a third-line therapy [8, 11]. Upper gastrointestinal toxicity Nonspecific upper gastrointestinal toxicity (GIT) can occur as an isolated presenting symptom, but more frequently coexists with lower GIT [1, 6]. The most frequent symptoms are nausea/vomiting (36% of patients)  and abdominal pain (83%) . Diagnosis can be challenging, given that patients on ICI therapy are often receiving concurrent malignancy therapies, suffering from the cumulative effect of previous treatment lines, or having malignancy progressionany of which can cause nausea and/or vomiting. Additionally, feeding-tube problems  in malignancy patients receiving ICI therapy can be a symptom of nonspecific upper GIT. GIT has been observed to be more common after anti-CTLA-4 therapy than after anti-PD1 and anti-PD-L1 therapy [14, 15]. Patients receiving PF 429242 anti-PD-L1 agents have lower rates of nausea and vomiting than patients receiving other chemotherapeutics (odds ratio [OR] 0.293,.