December 2024
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51 Reads
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1 Citation
The Journal of Allergy and Clinical Immunology In Practice
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December 2024
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51 Reads
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1 Citation
The Journal of Allergy and Clinical Immunology In Practice
December 2024
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4 Reads
Annales de Dermatologie et de Vénéréologie - FMC
March 2024
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171 Reads
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1 Citation
American Journal of Dermatopathology
Onychocytic matricoma (OCM) is a benign neoplasm of the nail matrix. Only 18 cases of this tumor have been reported in the literature to date. We retrospectively analyzed the clinical features of 14 patients with OCM. The most common clinical feature was longitudinal xanthopachyonychia (n = 9), followed by longitudinal leukopachyonychia (=3) and longitudinal pachymelanonychia (n = 2). The most common clinical findings identified following dermoscopy and analysis at high magnification of classical photographs were free-edge thickening of the nail plate without pitting (n = 14), longitudinal ridging (n = 7), round white clods (n = 7), white dots (n = 7), and filiform hemorrhages (n = 7), followed by oval and linear white clods (n = 5), fuzzy lateral border (n = 5), and red–purple blood clods (n = 3). Nail clipping histopathology showed a thickened nail plate with multiple, small, round-to-oval spaces. The tumor expressed immunopositivity for LEF-1. Dermoscopy of the nail plate and nail clipping histology provides useful information with regards to the differential diagnosis with subungual squamous cell carcinoma and nail melanoma. Ex vivo–in vivo correlation facilitates a better dermoscopic assessment of this unique underrecognized disease. However, the differential diagnosis between OCM and onychocytic carcinoma requires biopsy of the tumor. LEF-1 as an onychogenic marker can be used to resolve the differential diagnosis between OCM and subungual longitudinal acanthoma/seborrheic keratosis.
July 2021
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489 Reads
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9 Citations
Emerging Infectious Diseases
We report patients in their homes in France who had cutaneous lesions caused by Anthrenus sp. larvae during the end of winter and into spring. These lesions mimic bites but are allergic reactions to larvae hairs pegged in the skin. These lesions should be distinguished from bites of bed bugs or fleas.
August 2018
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16 Reads
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2 Citations
Melanoma Research
December 2016
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20 Reads
Annales de Dermatologie et de Vénéréologie
Introduction Le traitement combiné par vémurafénib et cobimétinib est associé à une augmentation significative de la survie globale des patients atteints de mélanome métastatique BRAFV600E muté. Les effets secondaires les plus fréquents sont les troubles gastro-intestinaux, une photosensibilité, la fièvre et des arthralgies. Nous rapportons, à notre connaissance, le premier cas de syndrome d’encéphalopathie postérieure réversible (PRES) induit par ce traitement combiné. Observations Un patient de 68 ans, sans antécédents notables, avait en novembre 2015 l’exérèse d’un mélanome SSM du tronc stade IIB AJCC (Breslow 7 mm, index mitotique élevé, non ulcéré). Des métastases pulmonaires et axillaires étaient diagnostiquées 4 mois plus tard. L’IRM cérébrale retrouvait une métastase au niveau du lobe pariétal gauche. Le patient était en excellent état général, parfaitement asymptomatique. Compte tenu d’un statut mutationnel BRAFV600E positif, un traitement par vémurafénib et cobimétinib était introduit. Après 12 jours de traitement, il était admis dans notre service pour confusion, céphalées, trouble du comportement et du langage. L’examen clinique retrouvait une HTA (190/90 mmHg) isolée. Les examens biologiques montraient une élévation de la CRP (57 mg/L) et une insuffisance rénale aiguë modérée. L’IRM cérébrale retrouvait des hypersignaux T2 FLAIR au niveau cortical et sous-cortical en faveur dans le contexte d’une méningite néoplasique avec œdème périlésionnel (Fig. 1). À ce stade, des soins de supports étaient débutés en plus d’un traitement par nicardipine intraveineuse. Le patient s’améliorait de façon spectaculaire en 7 jours, avec un contrôle de la tension artérielle. Une ponction lombaire était alors réalisée et retrouvait une protéinorachie modérée, une glycorachie basse sans cellules tumorales ni anticorps antineuronaux ou agents infectieux. Les explorations auto-immunes, infectieuses et hormonales étaient normales. À l’IRM, on objectivait une disparition quasi complète de l’œdème cérébral et des hypersignaux précédemment décrits (Fig. 2). Il ne persistait que la lésion pariétale gauche connue et stable. Sur l’ensemble de ces données, le diagnostic de PRES induit par la combinaison vémurafénib et cobimétinib a été retenu. Discussion La physiopathologie du PRES est mal connue. L’hypothèse principale serait une perte de l’autorégulation cérébrale et une dysfonction endothéliale, touchant principalement les lobes pariétaux et occipitaux. Dans notre cas, une des explications pourrait être une altération directe de la barrière endothéliale par le traitement combiné. Conclusion À notre connaissance, nous rapportons le premier cas de PRES induit par la combinaison vémurafénib–cobimétinib. En raison d’une utilisation de plus en plus importante de ce type de thérapie, les cliniciens doivent être informés de cet effet secondaire potentiel.
November 2016
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150 Reads
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10 Citations
Pigment Cell & Melanoma Research
The combination of BRAF and MEK inhibitors has improved the prognosis of patients with BRAFV600-mutated metastatic melanoma (Larkin et al., 2014). The toxicity profiles of these drugs are mostly defined by gastrointestinal events, photosensitivity, hepatitis, and arthralgia (Larkin et al., 2014). We report a case of posterior reversible encephalopathy syndrome (PRES) induced by vemurafenib and cobimetinib. A 68-year-old man, with neither a medical history nor any treatment, was surgically treated in November 2015 for stage IIB chest melanoma (superficial-spreading melanoma, Breslow 7 mm, with a high mitotic rate and without ulceration). This article is protected by copyright. All rights reserved.
October 2016
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89 Reads
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11 Citations
circadian clocks regulate a wide range of functions of human body organs, including the skin. Studies have shown that the key genes responsible for the differentiation and the proliferation of skin cells are regulated according to a circadian rhythm[1, 2]. This ascertainment might have some therapeutic consequences. Indeed, topical steroids are usually prescribed once daily but the time of application is not based on any scientific data. We hypothesized that the efficacy of topical corticosteroids in psoriasis might be influenced by the time of their application. This article is protected by copyright. All rights reserved.
April 2015
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437 Reads
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183 Citations
Disruption of the endothelial barrier by tumour-derived secreted factors is a critical step in cancer cell extravasation and metastasis. Here, by comparative proteomic analysis of melanoma secretomes, we identify the matricellular protein SPARC as a novel tumour-derived vascular permeability factor. SPARC deficiency abrogates tumour-initiated permeability of lung capillaries and prevents extravasation, whereas SPARC overexpression enhances vascular leakiness, extravasation and lung metastasis. SPARC-induced paracellular permeability is dependent on the endothelial VCAM1 receptor and p38 MAPK signalling. Blocking VCAM1 impedes melanoma-induced endothelial permeability and extravasation. The clinical relevance of our findings is highlighted by high levels of SPARC detected in tumour from human pulmonary melanoma lesions. Our study establishes tumour-produced SPARC and VCAM1 as regulators of cancer extravasation, revealing a novel targetable interaction for prevention of metastasis.
February 2015
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180 Reads
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29 Citations
JAMA Dermatology
This study compares the effectiveness of the copper bromide laser vs the Kligman formula combination cream for the treatment of melasma. Recent studies have suggested the potential effectiveness of targeting the vascular component of melasma.¹- 4 The copper bromide laser (Dual Yellow; Norseld) is a laser with a concomitant-output dual-wavelength light source comprising 90% yellow light at 578 nm, which targets vascular lesions, and 10% green light at 511 nm, which targets pigmentary lesions. There are 2 conflicting reports on the potential value of this laser for treating melasma.⁵,6 The objective of this study was to compare the effectiveness of the copper bromide laser vs the Kligman formula combination cream (a combination of hydroquinone, 5%, dexamethasone acetate, 0.1%, and retinoic acid, 0.1%) in the treatment of melasma.
... Dermestid hastisetae have been found obstructing the digestive tracts of invertebrate predators (Nutting and Spangler, 1969). Vertebrates, including humans, are also adversely affected by dermestids, with multiple reports of allergy, dermatitis, and lung and skin inflammatory reactions after dermestid exposure (Bernstein et al., 2009;MacArthur et al., 2016;Gumina and Yan, 2021;Simon et al., 2021). The internal structure of hastisetae contains an unidentified amorphous matrix, which is hypothesized to contain defensive proteins and/or chemicals, like the defensive hastisetae in Lepidoptera (Battisti et al., 2011;Ruzzier et al., 2021). ...
July 2021
Emerging Infectious Diseases
... Commonly used biologics such as Adalimumab (Humira), Infliximab (Remicade), Rituximab (Rituxan), and Etanercept (Enbrel) have all been implicated in numerous PRES cases as well. The high percentage of patients with PRES who have autoimmune disorders may further support the theory that PRES is in part caused by endothelial dysfunction, a process in which the host autoimmune response is essential; endothelial cells become activated and damaged by an inflammatory cytokine response stemming from monocytes and lymphocytes, which can lead to leakage of fluid and protein into the interstitium [8][9][10][11]. The symptoms of PRES evolve rapidly over hours to days and include seizures, headaches, altered consciousness, and visual disturbances often in the context of elevated BP as discussed above. Seizures are often the presenting symptom with only a small minority of patients with mild disease being seizure-free. ...
November 2016
Pigment Cell & Melanoma Research
... Nguyen et al. [179] performed a prospective randomized study comparing the efficacy of topical corticosteroids in forty-six psoriasis patients based on the time of their application; one group applied medications between 5 p.m. and 6 p.m., and the second group between 8 a.m. and 9 a.m. In the group of patients who applied for the treatment in the evening, the response to the therapy was faster compared to the patients who applied the medication in the morning. ...
October 2016
... In ovarian cancer it functions as a negative regulator by reducing macrophage recruitment and decreasing the associated inflammation [35]. In melanomas, SPARC expression has been reported to increase with tumor progression and its overexpression enhanced vascular leakiness, extravasation and metastasis [35][36][37]. Neural cell adhesion molecules such as neuronal glia related cell adhesion molecule (NrCAM, OVOC3931) play crucial roles in development and regeneration of the central nervous system. However, they are also associated with early tumor development of neuroblastoma [38]. ...
April 2015
... Other options, as triplecombination cream (TCC) of hydroquinone, tretinoin, and steroid, tranexamic acid, azelaic acid, kojic acid, arbutin, chemical peeling, lasers, ascorbic acid, rucinol, oligopeptides, silymarin, and various extracts, have been used with varying success. Therefore, the search for ideal treatment offering both effective and safe hypopigmentation in melasma, without long-term adverse effects, is still going on [5][6][7]. ...
February 2015
JAMA Dermatology
... Este fenómeno se ve significativamente potenciado por la presencia de pequeñas cantidades de UVA1 (340-400 nm), a través de mecanismos mediados por el receptor opsina 3, que estimulan la melanogénesis y estabilizan complejos multimericos de tirosinasa/proteína P. Además, la VL ha sido implicada en la fisiopatogenia de melasma y la hiperpigmentación postinflamatoria. La incorporación de óxidos de hierro en formulaciones de protectores solares ha mostrado eficacia en prevenir estas alteraciones, aunque su coloración visible puede afectar la aceptación cosmética del producto (76)(77)(78)(79)(80)(81)(82)(83)(84). ...
October 2014
Journal of the American Academy of Dermatology
... Este fenómeno se ve significativamente potenciado por la presencia de pequeñas cantidades de UVA1 (340-400 nm), a través de mecanismos mediados por el receptor opsina 3, que estimulan la melanogénesis y estabilizan complejos multimericos de tirosinasa/proteína P. Además, la VL ha sido implicada en la fisiopatogenia de melasma y la hiperpigmentación postinflamatoria. La incorporación de óxidos de hierro en formulaciones de protectores solares ha mostrado eficacia en prevenir estas alteraciones, aunque su coloración visible puede afectar la aceptación cosmética del producto (76)(77)(78)(79)(80)(81)(82)(83)(84). ...
June 2014
Pigment Cell & Melanoma Research
... In total, seven studies reported on patient satisfaction in various ways. 23,25,28,31,35,42,48 Due to the low number of studies and different methods used, no meta-analysis could be performed. ...
December 2013
British Journal of Dermatology
... In our department of Dermatology, QS laser was used to depigment normal skin in vitiligo prior to 2018 with good results. 5 Since then, the QS laser has been replaced by a picosecond laser. Therefore, we conducted a retrospective analysis to assess the efficacy of the picosecond laser in this indication. ...
November 2012