Abstract
Background
Gastrointestinal (GI) immune-related adverse events (irAEs) commonly limit immune checkpoint inhibitors’ (ICIs) treatment, which is very effective for metastatic melanoma. The independent impact of GI-irAEs on patients’ survival is not well studied. We aimed to assess the impact of GI-irAEs on survival rates of patients with metastatic melanoma using multivariate model.
Methods
This is a retrospective study of patients with metastatic melanoma who developed GI-irAEs from 1/2010 through 4/2018. A number of randomized patients who did not have GI-irAEs were included as controls. Kaplan–Meier curves and log-rank test were used to estimate unadjusted survival durations. The Cox proportional hazards model was used to evaluate survival predictors; irAEs were included as time-dependent variables.
Results
A total of 346 patients were included, 173 patients had GI-irAEs; 124 (72%) received immunosuppression. In multivariate Cox regression, ECOG 2–3 (HR 2.57, 95%CI 1.44–4.57; P < 0.01), LDH ≥ 618 IU/L (HR 2.20, 95% CI 1.47–3.29; P < 0.01), stage M1c (HR 2.21, 95% CI 1.35–3.60; P < 0.01) were associated with worse OS rates. Any grade GI-irAEs (HR 0.53, 95% CI 0.36–0.78; P < 0.01) was associated with improved OS rates. Immunosuppressive treatment did not affect OS (P = 0.15). High-grade diarrhea was associated with improved OS (P = 0.04). Patients who developed GI-irAEs had longer PFS durations on Cox model (HR 0.56, 95% CI 0.41–0.76; P < 0.01).
Conclusion
GI-irAEs are associated with improved OS and PFS in patients with metastatic melanoma. Furthermore, higher grades of diarrhea are associated with even better patients’ OS rates.
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Abbreviations
- CI:
-
Confidence interval
- CT:
-
Computed tomography
- CTLA-4:
-
Cytotoxic T-lymphocyte-associated protein 4
- ECOG:
-
Eastern Cooperative Oncology Group
- FDA:
-
Food and Drug Administration
- FDG PET:
-
Fluorodeoxyglucose positron emission tomography
- GI:
-
Gastrointestinal
- HQROL:
-
Health-related quality of life
- HR:
-
Hazard ratio
- ICI:
-
Immune checkpoint inhibitor
- iCPD:
-
Confirmed progressive disease
- iCR:
-
Immune complete response
- IDC:
-
Immune-mediated diarrhea and colitis
- imRECIST:
-
Immune-modified response evaluation criteria in solid tumors
- iPR:
-
Immune partial response
- IQR:
-
Interquartile range
- irAE:
-
Immune-related adverse event
- iRECIST:
-
Immune-related response evaluation criteria in solid tumors
- iSD:
-
Immune stable disease
- iUPD:
-
Immune unconfirmed progressive disease
- LDH:
-
Lactate dehydrogenase
- OS:
-
Overall survival
- PD-1:
-
Programmed cell death protein-1
- PD-L1:
-
Programmed death-ligand 1
- PFS:
-
Progression free survival
- SD:
-
Standard deviation
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Acknowledgements
Medical editing of this paper was provided by the Department of Scientific Publications at MD Anderson Cancer Center.
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This study was not supported by any funding.
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Contributions
HA-S: conceptualization, data curation, writing-original draft, methodology. FSA: writing-original draft, data curation. WQ: formal analysis, software, review and editing, methodology. YL: conceptualization, writing-review and editing, data curation. SP: conceptualization, writing-review and editing. AD: conceptualization, writing-review and editing, project administration, methodology. YW: conceptualization, writing-review and editing, project administration, methodology.
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Ethical approval
This retrospective, single-center study was approved by the Institutional Review Board at MD Anderson Cancer Center. Approval number: PA18-0472.
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This study was granted waiver of consent.
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Note on previous publication
This paper was partially published as a poster abstract at the Society for Immunotherapy of Cancer (SITC) 2018 conference (Washington, D.C., USA, 7–11 November 2018). Abstract number: P537 [1].
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Abu-Sbeih, H., Ali, F.S., Qiao, W. et al. Immune checkpoint inhibitor-induced colitis as a predictor of survival in metastatic melanoma. Cancer Immunol Immunother 68, 553–561 (2019). https://doi.org/10.1007/s00262-019-02303-1
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DOI: https://doi.org/10.1007/s00262-019-02303-1