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Characterization of Sentinel Lymph Node Immune Signatures and Implications for Risk Stratification for Adjuvant Therapy in Melanoma

  • Melanoma
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Abstract

Background

Although sentinel lymph node (SLN) biopsy is a standard procedure used to identify patients at risk for melanoma recurrence, it fails to risk-stratify certain patients accurately. Because processes in SLNs regulate anti-tumor immune responses, the authors hypothesized that SLN gene expression may be used for risk stratification.

Methods

The Nanostring nCounter PanCancer Immune Profiling Panel was used to quantify expression of 730 immune-related genes in 60 SLN specimens (31 positive [pSLNs], 29 negative [nSLNs]) from a retrospective melanoma cohort. A multivariate prediction model for recurrence-free survival (RFS) was created by applying stepwise variable selection to Cox regression models. Risk scores calculated on the basis of the model were used to stratify patients into low- and high-risk groups. The predictive power of the model was assessed using the Kaplan–Meier and log-rank tests.

Results

During a median follow-up period of 6.3 years, 20 patients (33.3%) experienced recurrence (pSLN, 45.2% [14/31] vs nSLN, 20.7% [6/29]; p = 0.0445). A fitted Cox regression model incorporating 12 genes accurately predicted RFS (C-index, 0.9919). Improved RFS was associated with increased expression of TIGIT (p = 0.0326), an immune checkpoint, and decreased expression of CXCL16 (p = 0.0273), a cytokine important in promoting dendritic and T cell interactions. Independent of SLN status, the model in this study was able to stratify patients into cohorts at high and low risk for recurrence (p < 0.001, log-rank).

Conclusions

Expression profiles of the SLN gene are associated with melanoma recurrence and may be able to identify patients as high or low risk regardless of SLN status, potentially enhancing patient selection for adjuvant therapy.

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Acknowledgments

Dr. Beasley is supported by the Society of Surgical Oncology Young Investigator award (2019) and by NIH K08 CA237726-01A1. Dr. Farrow is supported by a National Institutes of Health T-32 grant (T32-CA093245) for translational research in surgical oncology.

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Correspondence to Georgia M. Beasley MD MHS.

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The authors report no conflicts on interested related to this work. Dr. Beasley was a one-time consultant for Regneron in 2019.

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Farrow, N.E., Holl, E.K., Jung, J. et al. Characterization of Sentinel Lymph Node Immune Signatures and Implications for Risk Stratification for Adjuvant Therapy in Melanoma. Ann Surg Oncol 28, 3501–3510 (2021). https://doi.org/10.1245/s10434-020-09277-w

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  • DOI: https://doi.org/10.1245/s10434-020-09277-w

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