Abstract
Deregulation of JAK-STAT pathway seems to be relevant in mycosis fungoides (MFs). We report the case of a 23-year-old woman diagnosed of atypical MF carrying isolated PCM1::JAK2 fusion and eosinophilia. The disease was refractory to common treatments and progressed increasing the number of large CD30 positive T-cells. After progression, treatment with brentuximab vedotin was decided and decreased the proportion of large cells, but the low-grade component persisted, and the skin lesions worsened. Immunohistochemical expression of p-STAT3 detected in most tumor cells demonstrated the abnormal activation of JAK-STAT pathway. Very few cases of mature T-cell lymphomas carrying PCM1::JAK2 gene fusion have been reported to date, and we review previous cases described with this alteration. Described cases shared similar clinicopathological features and low genetic complexity, and the presence of PCM1::JAK2 fusion associates with a distinctive form of the disease.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors want to thank Xenia Riera, Francesc Garcia-Pallarols, and Lola Tobalina for their excellent technical assistance and English editing.
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This research was funded by grant Fondo de Investigacion Sanitaria (FIS), Instituto de Salud Carlos III PI17/313 (L.C.).
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Conceptualization: Juan Jose Rodriguez-Sevilla, Marta Salido, Ramon Maria Pujol, Luis Colomo; methodology: Maria Rodriguez-Rivera, Blanca Sanchez-Gonzalez, Fernando Gallardo; formal analysis and investigation: Juan Jose Rodriguez-Sevilla, Marta Salido, Ramon Maria Pujol, Blanca Sanchez-Gonzalez, Fernando Gallardo, Luis Colomo; writing — original draft preparation: Juan Jose Rodriguez-Sevilla, Marta Salido, Blanca Sanchez-Gonzalez, Fernando Gallardo, Ramon Maria Pujol, Luis Colomo; writing — review and editing: Juan Jose Rodriguez-Sevilla, Marta Salido, Ramon Maria Pujol, Luis Colomo; funding acquisition: Luis Colomo; supervision: Luis Colomo.
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Rodriguez-Sevilla, J.J., Salido, M., Rodriguez-Rivera, M. et al. PCM1::JAK2 fusion associates with an atypical form of mycosis fungoides. Virchows Arch 481, 967–973 (2022). https://doi.org/10.1007/s00428-022-03372-x
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DOI: https://doi.org/10.1007/s00428-022-03372-x