1
|
Abstract
ABSTRACT Keratoacanthoma (KA) is a cutaneous tumor with a biphasic pattern of growth. A rapidly growing phase is usually followed by involution. KA occurs on sun-damaged skin. There are many listed causative associations, which include some therapeutic agents. Debate continues as to whether KA is a variant of squamous carcinoma (SCC) or a separate entity. Reporting of KA versus SCC is markedly inconsistent. Reasons for inconsistency include overlapping microscopic criteria, variants of KA with more aggressive features, and possibly medicolegal concerns. Genetic studies have shown some differences between the 2 entities. Activation of apoptotic pathways has been demonstrated in KA. Genetic studies have shown a possible role of human polyomavirus 6 in the pathogenesis of at least some KAs. Given that some cases of KA have components that behave as conventional SCCs, KA can be considered as a low-grade variant of SCC with some genetic differences.
Collapse
|
2
|
Misago N, Ansai SI, Fukumoto T, Anan T, Nakao T. Keratoacanthoma en plaque/nodule: A brief report of the clinicopathological features of five cases. J Dermatol 2017; 44:803-807. [PMID: 28332728 DOI: 10.1111/1346-8138.13787] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 01/06/2017] [Indexed: 11/28/2022]
Abstract
Keratoacanthoma (KA) is characterized by exoendophytic growth with a central keratin-filled crater, representing the crateriform architecture. We herein report five rare cases of KA without a central keratin-filled crater. These KA cases histopathologically showed that one or a few infundibular structures/isthmic lobules had their own open keratotic pores on the surface without a common merged keratotic plug/horn, clinically representing verrucous (keratotic) plaque/nodule, namely, "KA en plaque/nodule". KA rarely but on occasion does show verrucous plaque (or nodular) lesions without a central keratin-filled crater, as the notion that KA invariably shows crateriform architecture is nonsensical.
Collapse
Affiliation(s)
| | - Shin-Ichi Ansai
- Division of Dermatology and Dermatopathology, Nippon Medical School Musashi Kosugi Hospital, Kawasaki, Japan
| | | | - Takashi Anan
- Sapporo Dermatopathology Institute, Sapporo, Japan
| | | |
Collapse
|
5
|
Kanzaki A, Kudo M, Ansai SI, Peng WX, Ishino K, Yamamoto T, Wada R, Fujii T, Teduka K, Kawahara K, Kawamoto Y, Kitamura T, Kawana S, Saeki H, Naito Z. Insulin-like growth factor 2 mRNA-binding protein-3 as a marker for distinguishing between cutaneous squamous cell carcinoma and keratoacanthoma. Int J Oncol 2016; 48:1007-15. [PMID: 26782292 PMCID: PMC4750532 DOI: 10.3892/ijo.2016.3323] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 12/08/2015] [Indexed: 12/28/2022] Open
Abstract
In the histopathological diagnosis of cutaneous tumors, the differential diagnosis of squamous cell carcinoma (SCC) with crateriform architecture and keratoacanthoma (KA) is often difficult so an accurate understanding of the biological features and the identification of reliable markers of SCC and KA are crucial issues. Insulin-like growth factor 2 mRNA-binding protein-3 (IGF2BP3, also known as IMP3) is thought of as a bona fide oncofetal protein, which is overexpressed and is involved in cell proliferation, migration, and invasion in several kinds of tumors. However, the role of IMP3 in cutaneous SCC and KA has not been well studied. Therefore, we focused on studying the biological functions of IMP3 in SCC and KA. In human skin SCC cell lines, HSC-1 and HSC-5, and the human keratinocyte cell line, HaCaT, IMP3 mRNA levels were significantly higher than that of normal human skin. The knockdown of IMP3 expression reduced the proliferation of HSC-1, and significantly reduced invasion by HSC-1 and HSC-5. In contrast, the knockdown of IMP3 did not significantly affect invasion by HaCaT cells. In immunohistochemical studies of SCC and KA tissues, the Ki-67 labeling index (LI) of the suprabasal cell layer was significantly higher in SCC, compared with KA tissues and the tumor-free margin (TFM) adjacent to SCC and KA. Most SCC tissues stained strongly positive for IMP3, but KA tissues and TFM were mostly negative for IMP3. The Ki-67 LI of the IMP3-positive group was significantly higher than that of the IMP3-negative group in the suprabasal cell layer of SCC. These results suggest that IMP3 plays an important role in proliferation and, more significantly, in the invasion of SCC, and may be a suitable marker for the histopathological diagnosis of SCC with a crateriform architecture and KA. Furthermore, IMP3 may potentially be a new therapeutic target for SCC.
Collapse
Affiliation(s)
- Akiko Kanzaki
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Mitsuhiro Kudo
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Shin-Ichi Ansai
- Department of Dermatology, Nippon Medical School Musashikosugi Hospital, Tokyo, Japan
| | - Wei-Xia Peng
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Kousuke Ishino
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | | | - Ryuichi Wada
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Takenori Fujii
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Kiyoshi Teduka
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Kiyoko Kawahara
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Yoko Kawamoto
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Taeko Kitamura
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| | - Seiji Kawana
- Department of Dermatology, Nippon Medical School, Tokyo, Japan
| | - Hidehisa Saeki
- Department of Dermatology, Nippon Medical School, Tokyo, Japan
| | - Zenya Naito
- Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
| |
Collapse
|