Guillemette Gagey’s research while affiliated with Université Paris Cité and other places

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Publications (2)


Figure 1. A (panels A-D), Sequential pictures of contrast-enhanced CT scans. Panels A and B, CT scan at admission showing an important bladder thickening with a vesico-prostatic mass. C, CT scan after corticosteroid therapy: partial regression of prostate lesion but persistence of bladder infiltration. D, CT scan 2 months after antiparasitic treatment showing decreased prostate lesion and reduced peri-vesical infiltration. Panel E, Plain abdominal x-ray with absent "porcelain bladder" aspect. B, Pathological aspects of prostatic biopsies. First biopsy (A-D). A and B, Hematoxylin and eosin-stained sections showing an inflammatory infiltrate rich in eosinophils, plasma cells, and neutrophils. C and D, Immunohistochemical CD138 staining and IgG4 stainings showing increased IgG4+ plasma cells meeting histological criteria for IgG4-RD. Second biopsy (E and F). Hematoxylin and eosin-stained sections revealing viable schistosome eggs (black arrows). Abbreviations: CT, computed tomography; IgG4-RD, IgG4-related disease.
Urogenital schistosomiasis mimicking IgG4-RD in a patient living with HIV
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March 2025

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Open Forum Infectious Diseases

Guillemette Gagey

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Didier Sorial

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Camille Rasmussen

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[...]

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David Boutboul

This article reports a case of urogenital schistosomiasis mimicking IgG4-related disease (IgG4-RD) in a 47-year-old immunocompromised man with HIV. Initially diagnosed with IgG4-RD, further biopsies revealed schistosoma eggs. Elevated IgG4 levels indicated a Th2 immune response, highlighting its complex role in antischistosomal immunity and the need for careful differential diagnosis.

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Follicular lymphoma research: an open dialogue for a collaborative roadmap

Histopathology

Follicular lymphoma (FL) is the second most common type of lymphoma (20% of all non‐Hodgkin lymphomas), derived from germinal centre (GC) B cells, and is characterised by its significant clinical, prognostic and biological heterogeneity, leading to complexity in management. Despite significant biological investigation and indisputable clinical progress since the advent of the immunotherapy era more than 20 years ago, much remains to be done to understand and cure this lymphoma. Today, FL is metaphorically a giant puzzle on the table with patches of sky, landscape and foliage clearly appearing. However, many of the remaining pieces are held by various stakeholders (e.g. clinicians, pathologists, researchers, drug developers) without global agreement on what the gaps are, or any clear blueprint on how to solve the puzzle of understanding the heterogeneity of this disease and create curative and tailored therapies. With the advent of new investigation and drug technologies, together with recent advances in our capacity to manage big data, the time seems ripe for a change of scale. More than ever, this will require collaboration between and within all stakeholders to overcome the current bottlenecks in the field. As for every investigator, we acknowledge that this first draft is necessarily biased, incomplete and some FL expert readers might recognise some remaining gaps not addressed. We hope they will reply to make this effort a collaborative one to assemble all the pieces in the most ideal fashion. As such, this review intends to be a first step and an interactive platform to a collaborative roadmap towards better understanding and care of FL.