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Goto K, Ogawa K, Hishima T, Oishi N, Tomita O, Tsuyuki T, Oda T, Iwahashi Y, Inaba Y, Honma K. Seborrheic Keratosis With Malignant Transformation (Invasive or Noninvasive Squamous Cell Carcinoma Arising in Seborrheic Keratosis): A Clinicopathologic and Immunohistochemical Study of 11 Cases. Am J Dermatopathol 2022; 44:891-899. [PMID: 36395445 DOI: 10.1097/dad.0000000000002245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Seborrheic keratosis is a common benign neoplasm composed of basaloid keratinocytes. However, little is known about the malignant transformation of the tumor. Eleven cases of seborrheic keratosis with malignant transformation were analyzed. The 11 patients included 5 male patients and 6 female patients with a median age of 75 years at diagnosis (68-90 years). The tumors arose at various sites from the scalp (n = 3) to the lower leg (n = 2). The median tumor size was 12 (10-32) and 40 (20-75) mm in 7 noninvasive and 4 invasive cases, respectively. One patient exhibited in-transit skin metastasis. Histopathology of the malignant components resembled porocarcinoma or inverted follicular keratosis. Bowenoid and pagetoid spreading was frequently observed. The malignant components expressed cytokeratin 5/6 (100%) and GATA3 (73%), but not cytokeratin 7 (0%), cytokeratin 19 (9%), BerEP4 (0%), c-kit (0%), and NUT (0%). No significant immunoreactivity of YAP1 was observed in any of the cases. Mutant-type immunostaining of p53 and PTEN was observed in 91% and 82% of the cases, respectively. An increase in p16 expression was seen in 6 (86%) of the 7 cases with noninvasive carcinoma, although a loss of p16 immunoexpression was seen in the invasive carcinoma component in 3 (75%) of the 4 cases. This study demonstrated that seborrheic keratosis can undergo malignant transformation, particularly in large-sized lesions in elderly patients. Malignant components mimic porocarcinoma or inverted follicular keratosis. Malignant transformation induced by TP53 and PTEN mutations and tumor invasion by CDKN2A inactivating mutations are suggested in this study.
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Affiliation(s)
- Keisuke Goto
- Department of Diagnostic Pathology and Cytology, Osaka International Cancer Institute, Osaka, Japan
- Department of Pathology, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan
- Department of Pathology, Itabashi Central Clinical Laboratory, Tokyo, Japan
- Department of Anatomic Pathology, Tokyo Medical University, Tokyo, Japan
- Department of Diagnostic Pathology, Shizuoka Cancer Center Hospital, Sunto, Japan
- Department of Clinical Laboratory and Diagnostic Pathology, Osaka National Hospital, Osaka, Japan
- Department of Dermatology, Hyogo Cancer Center, Akashi, Japan
- Department of Dermato-Oncology/Dermatology, National Hospital Organization Kagoshima Medical Center, Kagoshima, Japan
| | - Kohei Ogawa
- Department of Dermatology, Nara Medical University School of Medicine, Kashihara, Japan
| | - Tsunekazu Hishima
- Department of Pathology, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan
| | | | - Ozumi Tomita
- Dermatology, Faculty of Medicine, University of Yamanashi, Chuo, Japan
| | | | - Takao Oda
- Dermatology, Kainan Hospital, Yatomi, Japan ; and
| | | | - Yutaka Inaba
- Dermatology, Wakayama Medical University, Wakayama, Japan
| | - Keiichiro Honma
- Department of Diagnostic Pathology and Cytology, Osaka International Cancer Institute, Osaka, Japan
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Zanchetta C, Vilanova D, Jarrin C, Scandolera A, Chapuis E, Auriol D, Robe P, Dupont J, Lapierre L, Reynaud R. Bacterial taxa predictive of hyperpigmented skins. Health Sci Rep 2022; 5:e609. [PMID: 35425869 PMCID: PMC8989272 DOI: 10.1002/hsr2.609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 03/30/2022] [Accepted: 03/30/2022] [Indexed: 11/18/2022] Open
Abstract
Background and Aims Dark spots, brown spots, or hyperpigmented spots (HPS) are oval or irregular brown areas of skin. Their emergence is associated with dysregulation of the immune system, and may also be caused by a deficiency in stromal cell‐derived factor‐1, leading to perturbed melanogenesis and accumulation of melanosomes within neighboring keratinocytes. The skin microbiota (living microorganisms present on the surface of the skin) is known to play essential roles in maintaining skin homeostasis and in regulating the immune system. Here, we investigated whether the microbiota could play a role in the emergence of HPS. Methods The clinical study involved 38 European women, selected from among 74 volunteers. Participants were divided into two groups depending on the spot areas measured on their faces. The study was designed to avoid conflicting factors: both groups presented similar skin pH, hydration, transepidermal water loss, and sebum levels. The two cohorts were also age‐matched, with a mean of 29‐years‐old for both. Results Alpha‐diversity of the microbiota was similar for the two groups. On skins with more HPS, seven bacterial genera were identified in significantly higher proportions and included opportunistic pathogens and inflammatory bacteria. Six bacterial genera, including bacteria showing antioxidant and anti‐UV properties, were identified in significantly higher proportions on less spotted skins. Cross‐domain association networks revealed distinct co‐occurrences of genera between the two groups, suggesting nonidentical community structures and exchanges, depending on the HPS status. Conclusion Our results reveal specific microbiota composition and networks on skins based on HPS status. Changes could alter communication with the immune system, leading to the emergence of dark spots. As an essential part of the overall skin ecosystem, and through its interaction with the skin matrix, the skin microbiota and its maintenance could be considered a new target for skincare applications.
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Phadungsaksawasdi P, Kasuya A, Fukuchi K, Aoshima M, Nakazawa S, Suzuki T, Fujiyama T, Tokura Y, Honda T. Three-dimensional histological explanation of the dermoscopy patterns in acral melanocytic lesions. J Dermatol 2021; 48:1193-1200. [PMID: 33908083 DOI: 10.1111/1346-8138.15907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 03/15/2021] [Accepted: 03/29/2021] [Indexed: 12/01/2022]
Abstract
Dermoscopic images of pigmented lesions have distinct features on the sole where skin ridges and furrows exist. Pigmentation of benign nevus usually locates on the skin furrow, while the malignant melanoma is pigmented on the skin ridge. Correspondence between dermoscopy and pathology in the pigmented lesions on soles have been studied based on conventional vertical pathological images. However, for the full understanding of the correspondence, observation of horizontal histological images would be required, because the epidermis constructs unique horizontal structures, namely crista profunda limitans, crista profunda intermedia, and transverse ridge. In this study, we analyzed basic dermoscopic images of the representative acral melanocytic lesions (nevus, lentigo, and malignant melanoma) by horizonal histological images. We created serial horizontal pathological images by digital reconstruction of a hundred of serial vertical images. We could show that parallel furrow pattern is created by the pigmentation of crista profunda limitans, parallel ridge pattern by the pigmentation of both of crista profunda limitans and crista profunda intermediate, and lattice-like pattern by the pigmentation of transverse ridge. Our results would be useful for the intuitive histological understanding of dermoscopy.
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Affiliation(s)
| | - Akira Kasuya
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Kensuke Fukuchi
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Masahiro Aoshima
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Shinsuke Nakazawa
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Takahiro Suzuki
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan.,Dr. Phillip Frost Department of Dermatology & Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, USA
| | - Toshiharu Fujiyama
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yoshiki Tokura
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan.,Department of Cellular & Molecular Anatomy, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Tetsuya Honda
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
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Tan JM, Tom LN, Soyer HP, Stark MS. Defining the Molecular Genetics of Dermoscopic Naevus Patterns. Dermatology 2018; 235:19-34. [PMID: 30332666 DOI: 10.1159/000493892] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 09/19/2018] [Indexed: 11/19/2022] Open
Abstract
Melanocytic naevi are common melanocytic proliferations that may simulate the appearance of cutaneous melanoma. Naevi commonly harbour somatic mutations implicated in melanomagenesis but in most cases lack the necessary genomic alterations required for melanoma development. While the mitogen-activated protein kinase pathway and ultraviolet radiation strongly contribute to naevogenesis, the somatic mutational landscape of dermoscopic naevus subsets distinguishes some of the molecular hallmarks of naevi in relation to melanoma. We herein discuss the classification of naevi and theories of naevogenesis and review the current literature on the somatic alterations in naevi and melanoma. This review focusses on the clinical-dermoscopic-pathological and genomic correlation of naevi that shapes the current understanding of naevi.
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Affiliation(s)
- Jean-Marie Tan
- Dermatology Research Centre, The University of Queensland, The University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland, Australia
| | - Lisa N Tom
- Dermatology Research Centre, The University of Queensland, The University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland, Australia
| | - H Peter Soyer
- Dermatology Research Centre, The University of Queensland, The University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland, Australia.,Department of Dermatology, Princess Alexandra Hospital, Brisbane, Queensland, Australia
| | - Mitchell S Stark
- Dermatology Research Centre, The University of Queensland, The University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland,
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Kiuru M, Tartar DM, Qi L, Chen D, Yu L, Konia T, McPherson JD, Murphy WJ, Fung MA. Improving classification of melanocytic nevi: Association of BRAF V600E expression with distinct histomorphologic features. J Am Acad Dermatol 2018; 79:221-229. [PMID: 29653212 DOI: 10.1016/j.jaad.2018.03.052] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 03/25/2018] [Accepted: 03/29/2018] [Indexed: 02/03/2023]
Abstract
BACKGROUND A subset of melanomas carrying a B-Raf proto-oncogene, serine/threonine kinase gene (BRAF) V600E mutation, which is the most common targetable mutation in melanoma, arise in association with a melanocytic nevus that is also harboring a BRAF V600E mutation. The detailed histomorphologic characteristics of nevi positive for BRAF V600E have not been systematically documented. OBJECTIVE To identify histomorphologic features correlating with BRAF V600E status in nevi. METHODS We retrospectively identified melanocytic nevi from our laboratory reporting system. We performed a histomorphologic analysis and analysis of BRAF V600E expression by immunohistochemistry. RESULTS Thirteen nevi (14.8%) were negative and 76 (86.4%) were positive for BRAF V600E. The nevi positive for BRAF V600E were predominantly dermal (predominantly dermal growth in 55.3% of nevi positive for BRAF V600E and 15.4% of nevi negative for BRAF V600E [P = .01]) and showed a congenital growth pattern (congenital growth pattern in 51.3% of nevi positive for BRAF V600E and 15.4% of nevi negative for BRAF V600E [P = .02]). Compared with nevi negative for BRAF V600E, those that were positive for BRAF V600E often exhibited predominantly nested intraepidermal melanocytes, larger junctional nests, abrupt lateral circumscription, and larger cell size. Architectural disorder and inflammatory infiltrates were seen more often in nevi negative for BRAF V600E. BRAF sequencing of a subset of nevi confirmed the immunohistochemical results. LIMITATIONS Limitations include the study's retrospective design and the small sample size of nevi negative for BRAF V600E. CONCLUSIONS BRAF V600E is associated with distinct histomorphologic features in nevi. These features may contribute to improving the accuracy of classification and diagnosis of melanocytic neoplasms.
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Affiliation(s)
- Maija Kiuru
- Department of Dermatology, University of California, Davis, Sacramento and Davis, California; Department of Pathology and Laboratory Medicine, University of California, Davis, Sacramento and Davis, California.
| | - Danielle M Tartar
- Department of Dermatology, University of California, Davis, Sacramento and Davis, California
| | - Lihong Qi
- Department of Public Health Sciences, University of California, Davis, Sacramento and Davis, California
| | - Danyang Chen
- Department of Public Health Sciences, University of California, Davis, Sacramento and Davis, California
| | - Lan Yu
- Department of Dermatology, University of California, Davis, Sacramento and Davis, California
| | - Thomas Konia
- Department of Dermatology, University of California, Davis, Sacramento and Davis, California; Department of Pathology and Laboratory Medicine, University of California, Davis, Sacramento and Davis, California
| | - John D McPherson
- Department of Biochemistry and Molecular Medicine, University of California, Davis, Sacramento and Davis, California
| | - William J Murphy
- Department of Dermatology, University of California, Davis, Sacramento and Davis, California; Department of Internal Medicine, University of California, Davis, Sacramento and Davis, California
| | - Maxwell A Fung
- Department of Dermatology, University of California, Davis, Sacramento and Davis, California; Department of Pathology and Laboratory Medicine, University of California, Davis, Sacramento and Davis, California
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6
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Scott L, Miteva M. SnapshotDx Quiz: September 2017. J Invest Dermatol 2017; 137:e169. [PMID: 28843297 DOI: 10.1016/j.jid.2017.07.384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Laura Scott
- Department of Dermatology and Cutaneous Surgery, University of Miami L. Miller School of Medicine
| | - Mariya Miteva
- Department of Dermatology and Cutaneous Surgery, University of Miami L. Miller School of Medicine.
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7
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Melanocytic nevi and melanoma: unraveling a complex relationship. Oncogene 2017; 36:5771-5792. [PMID: 28604751 DOI: 10.1038/onc.2017.189] [Citation(s) in RCA: 120] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 05/09/2017] [Accepted: 05/10/2017] [Indexed: 12/11/2022]
Abstract
Approximately 33% of melanomas are derived directly from benign, melanocytic nevi. Despite this, the vast majority of melanocytic nevi, which typically form as a result of BRAFV600E-activating mutations, will never progress to melanoma. Herein, we synthesize basic scientific insights and data from mouse models with common observations from clinical practice to comprehensively review melanocytic nevus biology. In particular, we focus on the mechanisms by which growth arrest is established after BRAFV600E mutation. Means by which growth arrest can be overcome and how melanocytic nevi relate to melanoma are also considered. Finally, we present a new conceptual paradigm for understanding the growth arrest of melanocytic nevi in vivo termed stable clonal expansion. This review builds upon the canonical hypothesis of oncogene-induced senescence in growth arrest and tumor suppression in melanocytic nevi and melanoma.
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PI3K Signaling in Tissue Hyper-Proliferation: From Overgrowth Syndromes to Kidney Cysts. Cancers (Basel) 2017; 9:cancers9040030. [PMID: 28353628 PMCID: PMC5406705 DOI: 10.3390/cancers9040030] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 03/24/2017] [Accepted: 03/27/2017] [Indexed: 12/19/2022] Open
Abstract
The members of the PhosphoInositide-3 Kinase (PI3K) protein family are well-known regulators of proliferative signals. By the generation of lipid second messengers, they mediate the activation of AKT/PKB (AKT) and mammalian Target Of Rapamycin (mTOR) pathways. Although mutations in the PI3K/AKT/mTOR pathway are highly characterized in cancer, recent evidence indicates that alterations in the proliferative signals are major drivers of other diseases such as overgrowth disorders and polycystic kidney disease. In this review, we briefly summarize the role of the PI3K/AKT/mTOR pathway in cell proliferation by comparing the effect of alterations in PI3K enzymes in different tissues. In particular, we discuss the most recent findings on how the same pathway may lead to different biological effects, due to the convergence and cooperation of different signaling cascades.
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Roh MR, Eliades P, Gupta S, Tsao H. Genetics of melanocytic nevi. Pigment Cell Melanoma Res 2016; 28:661-72. [PMID: 26300491 DOI: 10.1111/pcmr.12412] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 08/19/2015] [Indexed: 01/05/2023]
Abstract
Melanocytic nevi are a benign clonal proliferation of cells expressing the melanocytic phenotype, with heterogeneous clinical and molecular characteristics. In this review, we discuss the genetics of nevi by salient nevi subtypes: congenital melanocytic nevi, acquired melanocytic nevi, blue nevi, and Spitz nevi. While the molecular etiology of nevi has been less thoroughly studied than melanoma, it is clear that nevi and melanoma share common driver mutations. Acquired melanocytic nevi harbor oncogenic mutations in BRAF, which is the predominant oncogene associated with melanoma. Congenital melanocytic nevi and blue nevi frequently harbor NRAS mutations and GNAQ mutations, respectively, while Spitz and atypical Spitz tumors often exhibit HRAS and kinase rearrangements. These initial 'driver' mutations are thought to trigger the establishment of benign nevi. After this initial phase of the cell proliferation, a senescence program is executed, causing termination of nevi growth. Only upon the emergence of additional tumorigenic alterations, which may provide an escape from oncogene-induced senescence, can malignant progression occur. Here, we review the current literature on the pathobiology and genetics of nevi in the hope that additional studies of nevi promise to inform our understanding of the transition from benign neoplasm to malignancy.
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Affiliation(s)
- Mi Ryung Roh
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Dermatology, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Philip Eliades
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Tufts University School of Medicine, Boston, MA, USA
| | - Sameer Gupta
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Hensin Tsao
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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Laville V, Clerc SL, Ezzedine K, Jdid R, Taing L, Labib T, Coulonges C, Ulveling D, Carpentier W, Galan P, Hercberg S, Morizot F, Latreille J, Malvy D, Tschachler E, Zagury JF. A genome-wide association study in Caucasian women suggests the involvement ofHLAgenes in the severity of facial solar lentigines. Pigment Cell Melanoma Res 2016; 29:550-8. [DOI: 10.1111/pcmr.12502] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 06/17/2016] [Indexed: 11/26/2022]
Affiliation(s)
- Vincent Laville
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
| | - Sigrid Le Clerc
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
| | - Khaled Ezzedine
- UMR U557, INSERM/U1125 INRA/CNAM; University Paris 13/Centre de Recherche en Nutrition Humaine Ile-de-France; Bobigny France
- Department of Dermatology; Hôpital Saint-André; Bordeaux France
| | - Randa Jdid
- Department of Skin Knowledge and Women Beauty; Chanel R&T; Pantin France
| | - Lieng Taing
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
| | - Taoufik Labib
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
| | - Cedric Coulonges
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
| | - Damien Ulveling
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
| | | | - Pilar Galan
- UMR U557, INSERM/U1125 INRA/CNAM; University Paris 13/Centre de Recherche en Nutrition Humaine Ile-de-France; Bobigny France
| | - Serge Hercberg
- UMR U557, INSERM/U1125 INRA/CNAM; University Paris 13/Centre de Recherche en Nutrition Humaine Ile-de-France; Bobigny France
- Department of Public Health; Hôpital Avicenne; Bobigny France
| | - Frederique Morizot
- Department of Skin Knowledge and Women Beauty; Chanel R&T; Pantin France
| | - Julie Latreille
- Department of Skin Knowledge and Women Beauty; Chanel R&T; Pantin France
| | - Denis Malvy
- UMR U557, INSERM/U1125 INRA/CNAM; University Paris 13/Centre de Recherche en Nutrition Humaine Ile-de-France; Bobigny France
- Department of Internal Medicine and Tropical Diseases; Hôpital Saint-André; Bordeaux France
| | - Erwin Tschachler
- Department of Dermatology; University of Vienna Medical School; Vienna Austria
| | - Jean-François Zagury
- Équipe Génomique, Bioinformatique et Applications; Chaire de Bioinformatique; Conservatoire National des Arts et Métiers; Paris France
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Marchetti MA, Kiuru MH, Busam KJ, Marghoob AA, Scope A, Dusza SW, Cordova MA, Fonseca M, Wu X, Halpern AC. Melanocytic naevi with globular and reticular dermoscopic patterns display distinct BRAF V600E expression profiles and histopathological patterns. Br J Dermatol 2014; 171:1060-5. [PMID: 25039578 DOI: 10.1111/bjd.13260] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2014] [Indexed: 01/05/2023]
Abstract
BACKGROUND BRAF (v-raf murine sarcoma viral oncogene homologue B) V600E mutations have been detected with high frequency in melanocytic naevi. Few studies have stratified analyses by naevus dermoscopic pattern. OBJECTIVES To determine the frequency of BRAF V600E expression and histopathological pattern in acquired melanocytic naevi distinguished by a globular vs. reticular dermoscopic pattern. METHODS We retrospectively identified histologically proven melanocytic naevi with banal reticular or globular dermoscopic patterns and evaluated BRAF V600E expression using immunohistochemistry. RESULTS BRAF V600E expression was detected in 11 of 12 globular naevi vs. four of 13 reticular naevi (91·7% vs. 30·1%, P = 0·004). A predominantly dermal growth pattern (P < 0·001) and the presence of large junctional nests (P = 0·017) were each associated with a globular dermoscopic pattern. The presence of either a predominantly dermal growth pattern or large junctional nests was found in 13 of 15 naevi positive for BRAF V600E and in two of 10 naevi negative for BRAF V600E (86·7% vs. 20%, P = 0·002). CONCLUSIONS The frequency of BRAF V600E mutations differs in naevi distinguished by unique dermoscopic structures and microanatomical growth patterns. Globular naevi, which most often histologically correspond to a predominantly dermal growth pattern and/or the presence of large junctional nests, are significantly more likely to express BRAF V600E than reticular naevi. These preliminary results require validation, but may directly inform future studies of naevogenesis and melanoma genesis.
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Affiliation(s)
- M A Marchetti
- Dermatology Service, Memorial Sloan Kettering Cancer Center, 160 East 53rd Street, 2nd Floor, New York, 10022, NY, U.S.A
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Piliouras P, Gilmore S, Wurm EM, Soyer HP, Zalaudek I. New insights in naevogenesis: Number, distribution and dermoscopic patterns of naevi in the elderly. Australas J Dermatol 2011; 52:254-8. [DOI: 10.1111/j.1440-0960.2011.00794.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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ZALAUDEK I, CATRICALÀ C, MOSCARELLA E, ARGENZIANO G. What dermoscopy tells us about nevogenesis. J Dermatol 2010; 38:16-24. [DOI: 10.1111/j.1346-8138.2010.01141.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Lin CB, Hu Y, Rossetti D, Chen N, David C, Slominski A, Seiberg M. Immuno-histochemical evaluation of solar lentigines: The association of KGF/KGFR and other factors with lesion development. J Dermatol Sci 2010; 59:91-7. [DOI: 10.1016/j.jdermsci.2010.06.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Revised: 06/06/2010] [Accepted: 06/14/2010] [Indexed: 02/07/2023]
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