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Dive into the research topics where Masayuki Iwai is active.

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Featured researches published by Masayuki Iwai.


Cancer | 1983

Mode of invasion, bleomycin sensitivity, and clinical course in squamous cell carcinoma of the oral cavity

Etsuhide Yamamoto; Gen-iku Kohama; Hajime Sunakawa; Masayuki Iwai; Hiroyoshi Hiratsuka

Forty patients with squamous cell carcinoma of the oral cavity were treated with bleomycin prior to undergoing surgery. The degree of the clinical effect of bleomycin and the postoperative clinical course of each case were estimated from the viewpoint of correlation with the mode of invasion. A strong correlation was found among the mode of invasion, bleomycin sensitivity, and clinical course. A slight effect of bleomycin and poor prognosis existed in the group with a diffuse invasion of mode of invasion, while the greatest effect of bleomycin and good clinical course were achieved in the group with a welldefined tumor‐host borderline.


Journal of Japan Society for Oral Tumors | 1998

Immunohistochemical study on expression of p34cdc2 in tongue squamous cell carcinomas with special reference to clinicopathological findings.

Lihua Yue; Masayuki Iwai; Isao Furuta

細胞周期に直接作用する蛋白質p34cdc2の発現を舌扁平上皮癌63例で免疫組織化学的に観察した。p34cdc2の発現は全症例中, 34例 (54.0%) を認めた。平均陽性細胞率は17.7%であった。p34cdc2の組織内局在は癌胞巣では周辺部であり, び漫性浸潤癌では散在して観察された。p34cdc2の発現とT因子との関連では, p34cdc2はT1群で4/11例 (36.4%) , T2群で22/37例 (59.5%) , T3群で4/5例 (80.0%) と発現され, T1, T2, T3の順で高値を示したが, T4群では4/10例 (40.0%) と低値となった。N因子との関連では, p34cdc2の発現はN0群では14/32例 (43.8%) であったのに比して, N1群で19/25例 (76.0%) であったが, N2群で1/6例 (16.7%) と低値であった。Stageとの関連でもp34cdc2の発現はStage I, Stage II, Stage IIIの順で高値となり, Stage IVで低値となる結果であった。すなわち, 舌癌の臨床的進行度に相応して細胞増殖能が高くなるが, 逆に著しく進行した癌では細胞増殖能が低下することが示唆された。p34cdc2の発現と病理組織学的所見との関連ではp34cdc2はWHOのGrade IIIで5/5例 (100%) , 浸潤様式4C, 4D型で10/15例 (66.7%) , 細胞異型性「強」で13/17例 (76.5%) と発現され, 有意に高値を示した。すなわち, p34cdc2の発現は舌癌の組織学的な悪性度所見と相応していた結果が得られた。以上の結果より, P34cdc2発現の検索は舌扁平上皮癌の悪性度の本態解明に有用と考えられた。


Japanese Journal of Oral & Maxillofacial Surgery | 1994

Immunohistochemical study of tongue squamous cell carcinoma by proliferating cell nuclear antigen (PCNA)

Masayuki Iwai; Li Yao; Isao Furuta


Japanese Journal of Oral and Maxillofacial Surgery | 1990

Peripheral ameloblastoma. Case report and review of the literature.

Masayuki Iwai; Isao Furuta; Jun-ichi Ohki; Yoichiro Kameyama


Japanese Journal of Oral & Maxillofacial Surgery | 1996

Results of preoperative combined therapy with radiation and multi-drug chemotherapy for oral squamous cell carcinomas

Masayuki Iwai; Toshiharu Sawada; Isao Furuta; Tadashi Sado; Ryuichi Terashima; Shigeto Ito


Japanese Journal of Oral & Maxillofacial Surgery | 1984

Cervical metastasis after excision of only primary lesion in non-advanced cancer of the tongue without local lecurrence

Etsuhide Yamamoto; Gen-iku Kohama; Shinya Densho; Yoshio Komatsu; Hajime Sunakawa; Masayuki Iwai; Itaru Nagai; Junji Kyogoku


Japanese Journal of Oral & Maxillofacial Surgery | 1998

A case of pleomorphic adenoma in the parotid gland extending to the skull base.

Shigehito Wada; Isao Furuta; Shigeru Ono; Masayuki Iwai; Tadashi Sado


Japanese Journal of Oral & Maxillofacial Surgery | 1997

A case of nevocellular nevus on the palatine with formation of an enormous mass

Tadashi Sado; Keiko Ishikawa; Shigeto Itou; Masayuki Iwai; Isao Furuta


Japanese Journal of Oral & Maxillofacial Surgery | 1997

A case of squamous cell carcinoma in the buccal mucosa with acute promyelocytic leukemia

Shigehito Wada; Isao Furuta; Tadashi Sado; Masayuki Iwai; Shigeto Itoh; Hiromi Kosugi


Japanese Journal of Oral & Maxillofacial Surgery | 1992

A case of erysipelas repeatedly recurring on the facialskin

Etsurou Kajimura; Masayuki Iwai; Makoto Yonemori; Isao Furuta

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Gen-iku Kohama

Sapporo Medical University

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Hajime Sunakawa

University of the Ryukyus

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Itaru Nagai

Sapporo Medical University

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Tohru Kaku

Health Sciences University of Hokkaido

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