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Yagi H, Nakaguro M, Ito M, Okumura Y, Takahashi S, Aoshima Y, Enomoto Y, Meguro S, Kawasaki H, Kosugi I, Shimoyama Y, Ogawa H, Tateyama H, Iwashita T. Difference in the distribution of tumor-infiltrating CD8+ T cells and FOXP3+ T cells between micronodular thymoma with lymphoid stroma and micronodular thymic carcinoma with lymphoid stroma. Pathol Int 2021; 71:453-462. [PMID: 33819365 PMCID: PMC8359975 DOI: 10.1111/pin.13099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/14/2021] [Indexed: 11/30/2022]
Abstract
Micronodular thymoma with lymphoid stroma (MNT) is a rare thymic epithelial neoplasm subtype characterized by a micronodular tumor cell growth pattern and abundant lymphoid stroma. Micronodular thymic carcinoma with lymphoid stroma (MNCA) is considered as a malignant counterpart of MNT and exhibits a growth pattern similar to that of MNT but has histologic features reminiscent of thymic squamous cell carcinoma, such as cytologic atypia and CD5 and CD117 immunoexpression. Although both MNT and MNCA are characterized by abundant lymphoid stroma, it remains unknown whether there are differences in infiltrating lymphocytes between MNT and MNCA. We analyzed the immune microenvironment profile in eight MNT and three MNCA cases. The cell density of CD8‐positive T cells was significantly higher in MNT than in MNCA, whereas that of FOXP3‐positive T cells was significantly higher in MNCA than in MNT. There was no significant difference in the cell density of programmed death protein 1‐positive T cells and programmed death ligand 1 expression between the MNT and MNCA cases. Our findings indicated that the immune microenvironment of MNCA differed from that of MNT and, compared with the T‐cell profile of MNT, that of MNCA was more suppressive to patients′ antitumor immune response.
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Affiliation(s)
- Haruna Yagi
- Department of Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Masato Nakaguro
- Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Masafumi Ito
- Department of Pathology, Japanese Red Cross, Nagoya First Hospital, Nagoya, Japan
| | - Yuki Okumura
- Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Seishiro Takahashi
- Department of Diagnostic Pathology, Seirei Mikatahara Hospital, Hamamatsu, Japan
| | - Yoichiro Aoshima
- Department of Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yasunori Enomoto
- Department of Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Shiori Meguro
- Department of Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Hideya Kawasaki
- Institute for NanoSuit Research, Preeminent Medical Photonics Education and Research Center, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Isao Kosugi
- Department of Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yoshie Shimoyama
- Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Hiroshi Ogawa
- Department of Diagnostic Pathology, Seirei Mikatahara Hospital, Hamamatsu, Japan
| | - Hisashi Tateyama
- Department of Pathology, Clinical Laboratory, Kasugai Municipal Hospital, Kasugai, Japan
| | - Toshihide Iwashita
- Department of Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
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