Abstract
Background
The effect of routine imaging in melanoma surveillance is unknown. In 2016, Denmark was the first country in the world to implement routine imaging with positron emission tomography-computed tomography with fluorodeoxyglucose (FDG PET-CT) in a nationwide, population-based surveillance program. This study aimed to determine the impact of surveillance with routine FDG PET-CT on hazard, cumulative incidence, and absolute risk of overall, locoregional, and distant recurrence detection in patients with stage IIB to IIID cutaneous melanoma.
Methods
This retrospective, population-based, nationwide cohort study used prospectively collected data from five national health registries to compare hazard, cumulative incidence, and absolute risk of recurrence in patients with cutaneous melanoma diagnosed in 2008–2010 (cohort 1, followed with clinical examinations) and patients with cutaneous melanoma diagnosed in 2016–2017 (cohort 2, followed with clinical examinations and routine FDG PET-CT at 6, 12, 24, and 36 months).
Results
The study included 1480 patients with stage IIB to IIID cutaneous melanoma. Cumulative incidences of overall and distant recurrence were higher in cohort 2, with a peak difference at three years (32.3 % vs 27.5 % and 25.8 % vs. 18.5 %, respectively). The hazard of recurrence was higher in cohort 2 during the first two years, with hazard rates for overall and distant recurrence of 1.16 (95 % confidence interval [CI], 0.93–1.44) and 1.51 (95 % CI, 1.16–1.96), respectively. The patterns persisted in absolute risk estimates.
Conclusions
Patients with stage IIB to IIID melanoma followed with routine FDG PET-CT had a 51 % increased hazard of distant recurrence detection within the first two years of surveillance. Future studies must determine whether this earlier recurrence detection translates into improved survival.
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Race/Ethnicity Data
Because Danish registries do not register race and ethnicity, we were unable to include this information in the patient characteristics presented in Table 1.
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Acknowledgment
This study was funded by research grants from The Danish Cancer Society, The Danish Cancer Research Foundation, and the Research Foundation of Copenhagen University Hospital: Herlev and Gentofte.
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Helvind, N.M., Weitemeyer, M.BM., Chakera, A.H. et al. Earlier Recurrence Detection Using Routine FDG PET-CT Scans in Surveillance of Stage IIB to IIID Melanoma: A National Cohort Study of 1480 Patients. Ann Surg Oncol 30, 2377–2388 (2023). https://doi.org/10.1245/s10434-022-13034-6
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DOI: https://doi.org/10.1245/s10434-022-13034-6