Uncovering the Wolf in Sheep's Clothing: Genetic Abnormalities of Oral Carcinoma Cuniculatum Elucidated – Hope for Early Diagnosis and Treatment – [Osaka University, Okayama University, Tokyo Institute of Science]
Key facts
- Uncovering the Wolf in Sheep's Clothing: Genetic Abnormalities of Oral Carcinoma Cuniculatum Elucidated – Hope for Early Diagnosis and Treatment – [Osaka University, Okayama University, Tokyo Institute of Science]
- A joint research group from Osaka University, Okayama University, and Tokyo Institute of Science has, for the first time in the world, elucidated the genetic abnormalities of oral carcinoma cuniculatum, a rare oral cancer. This discovery is expected to lead to early diagnosis and treatment.
- Source: PR Times
- Date: June 8, 2026
Direct answer
A joint research group from Osaka University, Okayama University, and Tokyo Institute of Science has, for the first time in the world, elucidated the genetic abnormalities of oral carcinoma cuniculatum, a rare oral cancer. This discovery is expected to lead to early diagnosis and treatment.
- Citation
- Uncovering the Wolf in Sheep's Clothing: Genetic Abnormalities of Oral Carcinoma Cuniculatum Elucidated – Hope for Early Diagnosis and Treatment – [Osaka University, Okayama University, Tokyo Institute of Science] (June 8, 2026), PR Times
- Source
- PR Times
- Date
- June 8, 2026
A joint research group from Osaka University, Okayama University, and Tokyo Institute of Science has, for the first time in the world, elucidated the genetic abnormalities of oral carcinoma cuniculatum, a rare oral cancer. This discovery is expected to lead to early diagnosis and treatment.
📋 Article Processing Timeline
- 📰 Published: June 8, 2026 at 00:10
- 🔍 Collected: June 7, 2026 at 15:20
- 🤖 AI Analyzed: June 12, 2026 at 12:19 (116h 58m after Collected)
June 7, 2026
National University Corporation Okayama University
https://www.okayama-u.ac.jp/
Investigation of cases of oral carcinoma cuniculatum, a very rare oral cancer, revealed part of the genetic abnormalities and the resulting characteristics of cancer cells.
Despite being a malignant cancer, carcinoma cuniculatum has a benign appearance similar to normal epithelial cells (making it hard to recognize as malignant), making diagnosis extremely difficult and often delaying treatment.
Pathological genetic abnormalities were found in 87.5% of carcinoma cuniculatum cases, revealing a characteristic "genetic pattern," suggesting that this abnormality may lead to the "benign appearance."
This is expected to enable more accurate and earlier diagnosis of carcinoma cuniculatum, leading to early treatment.
◆Overview
A joint research group consisting of Assistant Professor Sawako Ono and Professor Hidetaka Yamamoto from the Faculty of Medicine, Dentistry and Pharmaceutical Sciences at Okayama University (Headquarters: Kita-ku, Okayama City; President: Yasutomo Nasu); Assistant Professor Yuki Fukawa and Professor Naozumi Ishimaru from the Graduate School of Medical and Dental Sciences at Tokyo Institute of Science; and Assistant Professor Katsutoshi Hirose and Professor Satoru Toyosawa from the Graduate School of Dentistry at Osaka University has, for the first time in the world, clarified the genetic profile of oral carcinoma cuniculatum, a special subtype of oral squamous cell carcinoma. They also found that the genetic abnormalities may lead to characteristics of cancer cells such as low proliferative activity (Figure).
Carcinoma cuniculatum is a disease that resembles normal epithelial cells in its benign appearance (microscopic image) and is very difficult to diagnose as "cancer." Misdiagnosis or missed diagnosis often occurs, and diagnostic delay leads to patient disadvantages such as disease progression and increased mortality.
On the other hand, because carcinoma cuniculatum occurs very rarely, it is difficult to accumulate cases, and the molecular pathological features of carcinoma cuniculatum have remained largely unknown.
In this study, the research group collected cases of carcinoma cuniculatum from 2002 cases of oral squamous cell carcinoma. Using genetic analysis technology with next-generation sequencers, they identified pathological genetic abnormalities in 87.5% of carcinoma cuniculatum cases. They also clarified that it has a characteristic genetic profile different from general squamous cell carcinoma. Furthermore, they revealed that carcinoma cuniculatum is characterized by low proliferative activity of cancer cells in association with genetic abnormalities.
This research result, by clarifying the genetic profile, is expected to contribute to accurate and rapid diagnosis and early treatment of carcinoma cuniculatum. It is also expected to expand new treatment options such as molecular targeted drugs and provide important insights for elucidating the biological dynamics of carcinoma cuniculatum.
This research result was published in the official scientific journal of the North American Head and Neck Pathology Society, "Head and Neck Pathology," on May 25, 2026 (Monday, Japan time).
Figure: Microscopic image of carcinoma cuniculatum (left) and cancer characteristics (right).
◆Comment from Assistant Professor Katsutoshi Hirose
Carcinoma cuniculatum has been known long before I became a dentist, and its diagnostic difficulty has troubled many pathologists (oral pathologists). In this study, we created a diagnostic clue by clarifying the genetic abnormalities of carcinoma cuniculatum. I hope this research result will help not only patients suffering from oral cancer but also pathologists struggling with diagnosis.
◆Paper Information
This research result was published in the official scientific journal of the North American Head and Neck Pathology Society, "Head and Neck Pathology" (online), on May 25, 2026 (Monday, Japan time).
Title: "Genetic Landscape of Oral Carcinoma Cuniculatum and Its Histological Mimics"
Authors: Sawako Ono, Yuki Fukawa, Katsutoshi Hirose, Yumiko Hori, Daisuke Motooka, Hiroyuki Harada, Eiichi Morii, Satoru Toyosawa, Naozumi Ishimaru and Hidetaka Yamamoto.
DOI: https://doi.org/10.1007/s12105-026-01921-3
◆For more details on the research
Uncovering the Wolf in Sheep's Clothing: Genetic Abnormalities of Oral Carcinoma Cuniculatum Elucidated – Hope for Early Diagnosis and Treatment –
https://www.okayama-u.ac.jp/up_load_files/press_r8/press20260604-1.pdf
◆Inquiries
Assistant Professor Katsutoshi Hirose, Graduate School of Dentistry, Osaka University
Tel: +81-6-6879-2892
Fax: +81-6-6869-2895
Assistant Professor Sawako Ono, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
Tel: +81-86-235-7150
Fax: +81-86-235-77156
Assistant Professor Yuki Fukawa, Graduate School of Medical and Dental Sciences, Tokyo Institute of Science
Tel: +81-3-5803-5454
Fax: +81-3-5803-0188
General Affairs Section, General Affairs Division, Graduate School of Dentistry, Osaka University
Tel: +81-6-6879-2831
Fax: +81-6-6879-2832
Center for Innovative Clinical Medicine, Okayama University Hospital
2-5-1 Shikata-cho, Kita-ku, Okayama City, Okayama Prefecture, 700-8558
Please inquire about relevant matters from the URL below
http://shin-iryo.hospital.okayama-u.ac.jp/ph_company/
Industry-Academia-Government Collaboration Promotion Section, Research Promotion Division, Okayama University Hospital
2-5-1 Shikata-cho, Kita-ku, Okayama City, Okayama Prefecture, 700-8558
Tel: +81-86-235-7983
Email: ouh-csnw◎adm.okayama-u.ac.jp
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http://shin-iryo.hospital.okayama-u.ac.jp/medical/
Industry-Academia-Government Collaboration Headquarters, Research and Innovation Co-creation Organization, Okayama University
1-1-1 Tsushima-naka, Kita-ku, Okayama City, Okayama Prefecture, 700-8530 Okayama University Tsushima Campus, Main Building 1F
Tel: +81-86-251-8463
Email: sangaku◎okayama-u.ac.jp
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https://www.orsd.okayama-u.ac.jp/
Task Force for Strengthening and Improving the System for Sharing Research Equipment at Okayama University (Abbreviation: Team Sharing)
1-1-1 Tsushima-naka, Kita-ku, Okayama City, Okayama Prefecture, 700-8530 Okayama University Tsushima Campus, Main Building 1F
Tel: +81-86-251-8705
Fax: 08
FAQ
Why is diagnosing carcinoma cuniculatum difficult?
Because it resembles normal epithelial cells microscopically, making it hard to recognize as cancer.
What technology was used in this study?
Next-generation sequencing-based genetic analysis technology for high-precision detection of genetic abnormalities.
How will the results be useful?
They will contribute to diagnostic aids based on the genetic profile and development of molecular targeted drugs.