Publications by authors named "Perrot J"

Dendritic cells (DCs) are promising targets for cancer immunotherapies because of their central role in the initiation and control of immune responses. The rare cDC1 population is of particular interest because of its remarkable ability to cross-present antigens (Ag) to CD8+ T cells, to promote Th1 cell polarization and NK cell activation and recruitment. However, the spatial organization and specific functions of cDC1s in response to immunotherapy remain to be clearly characterized in human tumors.

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Corneal graft (keratoplasty) is the most common allograft in the world, but the imbalance between the number of donors and the number of patients waiting for transplants is abysmal on a global scale and varies enormously from one country to another. The risk of transmission of systemic diseases from donor to recipient is demonstrably low. In over 50 years and an estimated 2.

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Background And Objectives: Laser skin therapy and intense pulsed light (IPL) therapy are both light-based treatments used for various skin concerns. They have been used since decades and each system have their own specificity, advantages, and drawbacks. However specific treatment is still not accessible with standard techniques due to difficulties having a source with both laser and IPL advantages.

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Background/objectives: Hidrocystomas, eccrine and apocrine, are rare cystic lesions that form benign tumors of the sweat glands. This study aimed to describe the clinical features of hidrocystomas and evaluate the role of non-invasive imaging techniques, including dermoscopy, Line-field Confocal Optical Coherence Tomography (LC-OCT), Reflectance Confocal Microscopy (RCM), and Ultra-High-Frequency Ultrasound (UHFUS), in their diagnosis.

Methods: In total, seven cases of hidrocystomas were collected from the Dermatologic Clinic of the University of Siena, Italy.

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  • Lentigo maligna (LM) and LM melanoma (LMM) are challenging to surgically remove due to unclear boundaries, especially on the face where minimizing tissue excision is important.
  • This study evaluated the long-term effectiveness of using Reflectance Confocal Microscopy (RCM) alongside the "spaghetti" surgical technique for excising LM/LMM in 70 patients.
  • Findings showed a 5.7% recurrence rate over an average of 6.3 years, with the RCM method achieving effective margin clearance (2.7 mm) while reducing tissue removal compared to traditional methods (6.7 mm).
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Introduction: Line-field confocal optical coherence tomography (LC-OCT) represents one of the newest non-invasive in vivo skin imaging techniques. Previous studies described morphologic criteria of basal cell carcinoma (BCC) under LC-OCT examination. Preliminary data on LC-OCT diagnostic performance for BCC have recently been published but showed only a modest improvement compared to dermoscopy, possibly due to study limitations.

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  • Primary generalized glucocorticoid resistance syndrome (GGRS) is a rare condition linked to a mutation in the NR3C1 gene, specifically a missense variant affecting the Glucocorticoid Receptor's DNA Binding Domain.
  • A case study detailed a 59-year-old man with high cortisol levels and a misdiagnosis of Cushing disease, ultimately leading to a correct diagnosis of GGRS at age 68.
  • Functional tests on the identified gene variant indicated it had significantly reduced transcriptional activity, emphasizing the need for increased awareness of GGRS to prevent misdiagnosis and harmful treatments.
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Introduction: UVA-UVB increases skin matrix metalloproteinases and breaks down extracellular proteins and fibrillar type 1 collagen, leading to photodamage. Topical application of nicotinamide prevents UV-induced immunosuppression. Several studies have demonstrated the importance of protection against UV.

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  • Diagnosing atypical pigmented facial lesions (aPFLs) is difficult for dermatologists and crucial for patient care, as incorrect diagnoses can lead to mismanagement and delays in treatment.
  • The study compared machine learning and deep learning models to improve diagnostic accuracy of aPFLs using 1197 dermoscopic images classified into seven categories, focusing on the potential role of AI in supporting clinicians.
  • Results showed that while dermatologists were 71.2% accurate in identifying malignant versus benign lesions, their accuracy dropped to 42.9% when distinguishing among specific lesions, highlighting the complexity of aPFL evaluations.
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Atopic dermatitis (AD) is the most common chronic inflammatory dermatitis in developed countries, and has a major impact on those affected. Little is known about AD in elderly patients. This prospective multicentre observational study described the clinical characteristics and burden of AD in elderly subjects ≥ 65 years, as well as the therapeutic options chosen for this population in routine care, and compared findings with those in young adults with AD < 30 years.

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Ataxia with anti-regulator of G-protein signaling 8 autoantibodies (RGS8-Abs) is an autoimmune disease recently described in four patients. The present study aimed to identify other patients with RGS8-Abs, describe their clinical features, including the link between RGS8-related autoimmune cerebellar ataxia (ACA) and cancer. Patients with RGS8-Abs were identified retrospectively in the biological collections of the French Reference Center for Paraneoplastic Neurological Syndrome and the University of California San Francisco Center for Encephalitis and Meningitis.

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Exposure to mechanical stimuli such as pressure and stretching prompts the skin to undergo physiological adaptations to accommodate and distribute applied forces, a process known as mechanotransduction. Mechanotherapy, which leverages mechanotransduction, shows significant promise across various medical disciplines. Traditional methods, such as massage and compression therapy, effectively promote skin healing by utilizing this mechanism, although they require direct skin contact.

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The skin is an envelope that covers the entire body. Nowadays, understanding and studying the mechanical, biological and sensory properties of the skin is essential, especially in dermatology and cosmetology. The in-depth study of the skin's mechanical behaviour is a highly intriguing challenge, enabling the differentiation of the behaviour of each layer.

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Significance: Multilesional basal cell carcinoma (BCC) are spread on sun exposed skin areas, including arms, face and back. The first-line treatment remains the surgical resection or Mohs surgery. Despite its high complexity, Mohs surgery is well practiced in USA and Germany and presents very good results both in esthetic and in carcinology point of view.

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  • Extramammary Paget disease (EMPD) is a rare skin cancer that often gets misdiagnosed due to its misleading appearance, complicating effective treatment and diagnosis.
  • Traditional methods like biopsies are invasive and can be uncomfortable for patients, and non-invasive techniques have limited effectiveness.
  • Line-field confocal optical coherence tomography (LC-OCT) is a promising new imaging technology that provides better diagnostic accuracy for EMPD and its recurrence, with a study showing much higher accuracy rates after proper training in its use.
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  • Porokeratosis variants are uncommon skin conditions that can often be misdiagnosed, mimicking more common skin issues.
  • A new technology called line-field confocal optical coherence tomography (LC-OCT) allows for non-invasive imaging of the skin, providing detailed views up to 500µm deep.
  • In a study with 54 patients, LC-OCT showed high reliability in diagnosing porokeratosis variants and identified unique features not visible in traditional histology, suggesting it could help avoid unnecessary biopsies.
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Introduction: Chronic inflammatory dermatoses (CIDs) can significantly affect patients' lives. The Observatory of Chronic Inflammatory Skin Diseases (OMCCI) cohort was initiated to quantify the impact and disease evolution of four CID over 4 years' follow-up; at least 1,000 patients per CID are planned to be enrolled. The objective of this study was to present baseline characteristics of patients included in the OMCCI cohort between December 2020 and September 2022.

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Background: Clinical trials and real-life data have reported an increased incidence of conjunctivitis in patients treated with dupilumab for their atopic dermatitis (AD). Although mostly mild in severity, in some cases conjunctivitis will appear or increase after dupilumab initiation, which can lead to dupilumab discontinuation.

Objectives: (1) To describe the characteristics of patients developing conjunctivitis requiring discontinuation of dupilumab; and (2) to analyse the factors associated with a complete conjunctivitis improvement after dupilumab discontinuation and a switch to tralokinumab or Janus kinase inhibitors.

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  • * Researchers collected a dataset of 471 lesions from 10 European centers and evaluated them through a blinded analysis involving 156 dermatologists of varying experience, using a specialized online platform.
  • * The findings revealed that certain areas, like the heel and fingers, had higher rates of early-stage melanomas compared to atypical nevi, and demonstrated that diagnosing lesions in the plantar arch was particularly challenging for dermatologists.
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Basal cell carcinoma (BCC) is the most frequent malignancy in the general population. To date, dermoscopy is considered a key tool for the diagnosis of BCC; nevertheless, line-field confocal optical coherence tomography (LC-OCT), a new non-invasive optical technique, has become increasingly important in clinical practice, allowing for in vivo imaging at cellular resolution. The present study aimed to investigate the possible correlation between the dermoscopic features of BCC and their LC-OCT counterparts.

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