Abstract
Purpose
It can be challenging to differentiate pseudoprogression from progression. We assessed the ability of dynamic contrast enhanced T1 MRI (DCE-MRI) perfusion to identify pseudoprogression in melanoma brain metastases.
Methods
Patients with melanoma brain metastases who underwent immunotherapy and DCE-MRI were identified. Enhancing lesions ≥ 5mm in diameter on DCE-MRI and that were new or increased in size between a week from beginning the treatment, and a month after completing the treatment were included in the analysis. The 90th percentiles of rVp and rKtrans and the presence or absence of hemorrhage were recorded. Histopathology served as the reference standard for pseudoprogression. If not available, pseudoprogression was defined as neurological and radiographic stability or improvement without any new treatment for ≥ 2 months.
Results
Forty-four patients were identified; 64% received ipilimumab monotherapy for a median duration of 9 weeks (range, 1–138). Sixty-four lesions in 44 patients were included in the study. Of these, nine lesions in eight patients were determined to be pseudoprogression and seven lesions were previously irradiated. Forty-four progression lesions and eight pseudoprogression lesions were hemorrhagic. Median lesion volume for pseudoprogression and progression were not significantly different, at 2.3 cm3 and 3.2 cm3, respectively (p = 0.82). The rVp90 was smaller in pseudoprogression versus progression, at 2.2 and 5.3, respectively (p = 0.02), and remained significant after false discovery rate adjustment (p = 0.04).
Conclusions
Pseudoprogression exhibited significantly lower rVp90 on DCE-MRI compared with progression. This knowledge can be useful for managing growing lesions in patients with melanoma brain metastases who are receiving immunotherapy.
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Funding
Research reported in this publication was partially supported by the National Cancer Institute of the National Institutes of Health under Award Number R25CA020449 and Core Grant P30 CA008748. The content is solely the responsibility of the authors and does not represent the official views of the National Institutes of Health.
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Alexander N Shoushtari is on the advisory board for Bristol-Myers Squibb, Immunocore, Castle Bioscences, and has institutional research support from Bristol-Myers Squibb, Immunocore, AstraZeneca, and Xcovery. Robert J Young consults for Agios, Puma, NordicNeuroLab, Icon, and has a grant funding from Agios. All other authors have no conflict of interests related to this study.
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Yoshie Umemura and Diane Wang are co-first authors.
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Umemura, Y., Wang, D., Peck, K.K. et al. DCE-MRI perfusion predicts pseudoprogression in metastatic melanoma treated with immunotherapy. J Neurooncol 146, 339–346 (2020). https://doi.org/10.1007/s11060-019-03379-6
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DOI: https://doi.org/10.1007/s11060-019-03379-6