Autoimmune colitis and neutropenia in adjuvant anti-PD-1 therapy for malignant melanoma: efficacy of Vedolizumab, a case report

Corticosteroid-dependent immune checkpoint inhibitor-induced enterocolitis treated with vedolizumab: a case report

Background

Immune checkpoint inhibitors (ICIs) have greatly improved the survival in several cancers. Immune-related adverse events (irAEs) are common in patients on ICI therapy, as inhibition of cytotoxic T-lymphocyte antigen 4 (CTLA-4) or programmed cell death protein 1 (PD-1) leads to non-selective activation of the immune system. ICI-induced enterocolitis is highly prevalent and corticosteroid administration is the first-line treatment. Selective immunosuppressive therapy was employed for steroid-refractory patients. The monoclonal antibody vedolizumab exhibits gut-specific immunosuppressive effects by targeting the α4β7 integrin.

Case Description

We report a case of corticosteroid-dependent camrelizumab-induced enterocolitis in a 58-year-old man with hepatocellular carcinoma (HCC) who was treated with vedolizumab. The patient's diarrhea resolved following the administration of two doses of vedolizumab (300 mg), and he was able to stop using corticosteroids. He later underwent surgery and HCC treatment, including appropriate management of ICI-induced enterocolitis, and achieved a complete pathological response.

Conclusions

This report illustrates the valuable role of vedolizumab in treating ICI-induced enterocolitis that is refractory to corticosteroid treatment.

A 1-year follow-up study on checkpoint inhibitor-induced colitis: results from a European consortium

BACKGROUND

Data regarding the clinical outcome of patients with immune checkpoint inhibitor (ICI)-induced colitis are scant. We aimed to describe the 12-month clinical outcome of patients with ICI-induced colitis.

MATERIALS AND METHODS

This was a retrospective, European, multicentre study. Endoscopy/histology-proven ICI-induced colitis patients were enrolled. The 12-month clinical remission rate, defined as a Common Terminology Criteria for Adverse Events diarrhoea grade of 0-1, and the correlates of 12-month remission were assessed.

RESULTS

Ninety-six patients [male:female ratio 1.5:1; median age 65 years, interquartile range (IQR) 55.5-71.5 years] were included. Lung cancer (41, 42.7%) and melanoma (30, 31.2%) were the most common cancers. ICI-related gastrointestinal symptoms occurred at a median time of 4 months (IQR 2-7 months). An inflammatory bowel disease (IBD)-like pattern was present in 74 patients (77.1%) [35 (47.3%) ulcerative colitis (UC)-like, 11 (14.9%) Crohn's disease (CD)-like, 28 (37.8%) IBD-like unclassified], while microscopic colitis was present in 19 patients (19.8%). As a first line, systemic steroids were the most prescribed drugs (65, 67.7%). The 12-month clinical remission rate was 47.7 per 100 person-years [95% confidence interval (CI) 33.5-67.8). ICI was discontinued due to colitis in 66 patients (79.5%). A CD-like pattern was associated with remission failure (hazard ratio 3.84, 95% CI 1.16-12.69). Having histopathological signs of microscopic colitis (P = 0.049) and microscopic versus UC-/CD-like colitis (P = 0.014) were associated with a better outcome. Discontinuing the ICI was not related to the 12-month remission (P = 0.483). Four patients (3.1%) died from ICI-induced colitis.

CONCLUSIONS

Patients with IBD-like colitis may need an early and more aggressive treatment. Future studies should focus on how to improve long-term clinical outcomes.

Exploring Immune-Related Adverse Events: A Case of Febrile Neutropenia in a Melanoma Patient Receiving Immunotherapy

Introduction

The introduction of immune checkpoint inhibitors (ICIs) has opened a new chapter in cancer treatment. Nevertheless, their use may result in immune-related adverse events (irAEs) with multifactorial determinants, complex mechanisms, and varying clinical implications. In specific cancer types, like melanoma, irAEs exhibit a complex relationship with patient outcomes.

Case Presentation

We present a case of febrile neutropenia following ICI therapy in a patient with metastatic melanoma, underscoring the intricate clinical landscape associated with irAEs in the context of cancer immunotherapy. More specifically, a 68-year-old man was diagnosed with metastatic malignant melanoma and administered a combination of nivolumab and ipilimumab. However, after a single dose, the patient was hospitalized due to febrile neutropenia. The patient eventually recovered, but a diagnosis of myelosuppression related to prior immunotherapy led to treatment discontinuation. Subsequently, the patient transitioned to a second-line therapy.

Conclusion

This case contributes to our comprehension of rare yet potentially severe hematological irAEs and their influence on immunotherapy outcomes. Such insights will guide future diagnostic and therapeutic strategies in the field of immunotherapy.

Pharmacological Treatments Available for Immune-Checkpoint-Inhibitor-Induced Colitis

Immune checkpoint inhibitor treatment has shown revolutionary therapeutic effects in various carcinomas. However, immune-related adverse events (irAE) following this treatment can sometimes lead to treatment discontinuation. One such frequently encountered adverse event is immune-related colitis (irAE colitis). Corticosteroids (CS) are the first-line treatment for irAE colitis, but we often encounter CS-refractory or -resistant cases. The application of multiple biologics has been proposed as a therapy to be administered after CS treatment; however, the efficacy and safety of biologics for patients with irAE colitis who do not respond to CS have not been established. This review summarizes the treatment regimens available for irAE colitis, focusing on the mechanism of action of corticosteroids, infliximab, vedolizumab, and other drugs.