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Dive into the research topics where Yasuhiro Tsuneta is active.

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Featured researches published by Yasuhiro Tsuneta.


Cancer | 1985

Prognostic significance of nuclear DNA content in small cell carcinoma of the lung.

Shosaku Abe; Shiro Makimura; Koichi Itabashi; Tatsuo Nagai; Yasuhiro Tsuneta; Yoshikazu Kawakami

The relationship between the nuclear DNA histogram patterns of tumor cells obtained by brushing via bronchoscopy and the survival time of 39 patients with small cell carcinoma of the lung was investigated. The brushing smears were stained by a modified Feulgen method. The nuclear DNA content was measured at 550 nm using a microspectrophotometer. The DNA histogram pattern was classified into type I, which contained a higher proportion of G0G1‐phase cells, and type II, which contained a higher proportion of S, G2M‐phase cells. The median survival times for the patients with limited disease of type I, type II and the patients with extensive disease of type I, type II were 17.2 months, 10.2 months, 10.0 months, and 5.6 months, respectively. Patients with limited disease of type I had a significantly longer survival time than patients with limited disease of type II. A distinct correlation was found between the histogram pattern and the survival of the patients. These results indicated that the nuclear DNA histogram pattern may be an indicator to allow speculation as to the prognosis of patients with small cell carcinoma of the lung. Cancer 56: 2025‐2030, 1985.


Cancer | 1982

Chromate lung cancer with special reference to its cell type and relation to the manufacturing process

Shosaku Abe; Yutaka Ohsaki; Kiyonobu Kimura; Yasuhiro Tsuneta; Hiroshi Mikami; Makoto Murao

The manufacturing process of the chromate industry can be classified into five steps. The main hazardous pollutants of the first step are trivalent chromate compounds, and those of the second and third steps are hexavalent chromate compounds. Analysis of the detailed working history of chromate workers with bronchogenic carcinoma, yielded the following results: the work history of chromate lung cancer patients in the first step, which produced mainly trivalent chromate dust, was rather short. Patients with small cell carcinoma were engaged mainly in the second step (98.1% of the total working months), where they were heavily exposed to hexavalent chromate dusts. Patients with squamous cell carcinoma were engaged rather evenly in the second and fourth steps, and somewhat longer in the third step. Comparisons of the exposure periods revealed that the working history of small cell carcinoma patients was significantly shorter than that of squamous cell carcinoma patients. There were many more heavy smokers among the squamous cell carcinoma group as compared to the small cell carcinoma patients. Based on these results, it is concluded that the cell type of occupational lung cancer was mainly small cell carcinoma when the exposure to carcinogenic agents was heavy, and that the carcinogenicity of chromate was derived mainly from hexavalent chromate rather than trivalent compounds.


Pathology International | 1988

CHORIOCARCINOMA OF THE ESOPHAGUS PRODUCING CHORIONIC GONADOTROPIN

Yuko Kikuchi; Yasuhiro Tsuneta; Terukuni Kawai; Miki Aizawa

An autopsy case of primary esophageal choriocarcinoma in a 42‐year‐old Japanese male Is reported. The tumor was pure choriocarcinoma typical hemorrhagic and necrotic nature occupying almost the entire circumference of the mid‐esophagus. The choriocarcinoma had metastasized to the liver, lung and lymph nodes. In the esophageal tumor, immunohistochemical staining showed the presence of mainly human chorionic gonadotropin (HCG), with human placental lactogen (HPL) in a few syncytiotrophoblastic cells. Only 3 cases of extragonadal choriocarcinoma originating in the esophagus have been reported up to now. The possible pathogenesis and pathological characteristics of primary esophageal choriocarcinoma are discussed.


The Journal of the Japanese Society of Clinical Cytology | 1986

Nuclear DNA content of small cell carcinoma of the lung and its relationship to the cytomorphologic features.

Shosaku Abe; Shiro Makimura; Koichi Itabashi; Tatsuo Nagai; Yasuhiro Tsuneta; Yoshikazu Kawakami; Mikio Arakawa; Takashi Endo; Mikio Shimizu

肺小細胞癌18症例の経気管支擦過細胞を用いて核クロマチンの形態と核DNA量ヒストグラムパターンとの関係について, 化学療法に対する有効性の面から検討した.核DNA量の多いB typeを示した7症例のうち, 核クロマチンが微細顆粒状で均一に分布している細胞の多い症例は6例と多く, 化学療法に対する反応性も良好であった.核DNA量の少ないA typeを示した11症例のうち, 核クロマチンが微細顆粒状で均一に分布している細胞の多い症例は5例, 粗大顆粒状で不均一に分布する細胞の多い症例は6例であった.微細顆粒状で均一に分布する細胞の多い症例でも化学療法に対する反応性は不良であった.核クロマチンが微細顆粒状で均一に分布する細胞の多い肺小細胞癌は核DNA量も多く, 化学療法に対する反応性も比較的良好であった.しかし, 核DNA量ヒストグラムがA typeを示した肺小細胞癌は相関しなかった。肺小細胞癌症例の化学療法に対する反応性などの特異な臨床病態を推定するには核クロマチン形態のみの検討では十分とはいえず, 核DNA量の測定, 分析がより重要であることが示された.


The Journal of the Japanese Society of Clinical Cytology | 1985

Ultrastructure of experimental atypical metaplasia in brochial epithelium and carcinoma in situ.

Tatsuo Nagai; Shosaku Abe; Koichi Itabashi; Shiro Makimura; Yasuhiro Tsuneta; Yoshikazu Kawakami

20メチルコラントレン気管支粘膜下注入により実験的に気管支異型化生上皮と上皮内癌を作製し, 両者の核構造を超微形態学的に比較検討した. 上皮内癌は核不整が強く, 比較的大型の核小体を有する細胞が数多く認められた. また, 核膜周辺部にperichromatin granuleが多数観察された. 高度異型化生上皮では, 表層の細胞は核不整が強いが, 中層および基底層の細胞は不整の程度は軽度であった. また上皮内癌に比較しperichromatin granuleの出現頻度は少なく, 核小体の肥大も明らかでなかった.以上の結果から, いくつかの類似する所見を認めたものの, 核輪郭の不整の程度, perichromatingranuleの出現頻度, 核小体の肥大などの点で異型化生上皮と上皮内癌との間に差があることが示唆された.


Haigan | 1985

Nuclear DNA content of small cell carcinoma of the lung and its relationship to response to chemotherapy.

Shosaku Abe; Koichi Itabashi; Shiro Makimura; Tatsuo Nagai; Yasuhiro Tsuneta; Yoshikazu Kawakami

肺小細胞癌の核DNA量を測定し, そのヒストグラムと, 化学療法に対する効果との関係を検討した.A型 (G0G1期に相当する細胞の多い型) を示した症例は化学療法に対する効果は不良で, B型 (S, G2M期に相当する細胞の多い型) を示した症例は化学療法に対する効果は良好であった.肺小細胞癌の核DNA量のヒストグラムの解析は化学療法剤の選択, 治療法の選択に有力な指標になると考えられた.


Japanese Journal of Lung Cancer | 1981

Multiple Bronchogenic Carcinoma in Chromate Workers

Yutaka Ohsaki; Shosaku Abe; Yasuhiro Tsuneta; Kiyonobu Kimura; Hiroshi Mikami; Makoto Murao

クロムエ場従業員よりの3例の多発性肺癌-両側性-を経験した.内, 2例は両肺に生じた扁平上皮癌例であり, 1例は左肺に小細胞癌, 右肺に扁平上皮癌の同時発生例であった.扁平上皮癌両側発生例の内1例は手術を行った.1例は生前に診断を得たが病期が進行していたため死亡し、最後の例と共に剖検により子細に検索し得た.昭和56年春までにクロム工場従事者303名中, 21例の肺癌を見出し, この内, 剖検, 手術の可能な例8例であった.肺癌発生率の高頻度, また症例のような多発性肺癌を生ずることよりクロム塩類の強力な発癌性が示唆された.


Haigan | 1980

A study on lung cancer among chromate workers Relationship between cell type and chromium compounds

Shosaku Abe; Yutaka Ohsaki; Kiyonobu Kimura; Yasuhiro Tsuneta; Hiroshi Mikami; Makoto Murao

クロム肺癌に発癌の関与する物質を検討するため, クロム酸塩製造工程別の従事期間を肺癌例と非癌例で検討した.肺癌例は6価クロムを取り扱う従事者に多かった.特に, 小細胞癌例では全従事期間のほとんど全てを水溶性の6価クロムを取り扱う工程に従事していた.クロム肺癌の発癌物質として, 水溶性の6価クロムが関与している可能性が示された.


Nihon Naika Gakkai Zasshi | 1976

AN ADULT CASE OF THE PARALYTIC POLIOMYELITIS SYNDROME INDUCED BY COXSACKIE VIRUS TYPE A-2

Kiyonobu Kimura; Yasuhiro Tsuneta; Toshio Kirisawa; Yukihiko Honma; Yutaka Ohsaki; Makoto Murao

麻痺性ポリオ症候群paralytic poliomyelitis syndromeは,その原因としてポリオウイルスが広く知られているが,他の腸管系ウイルスや,ムンプスウイルス,ヘルペスウイルスなどのウイルスによつても発症する.コクサッキーA群ウイルスによつて麻痺を呈する例は,比較的少なく,とくにA2型によると確定診断されたものは,本邦では報告がない.われわれは, 27才男性で,感冒様症状をもつて発症し,四肢の弛緩性麻痺および顔面神経,舌咽神経,迷走神経麻痺を呈し, 2カ月後には,ほぼ正常にまで回復した症例を経験した.原因にかんしては,血清学的にコクサッキーウイルスA2型に対する中和抗体価の有意の上昇を認め,さらに便,髄液中から同型ウイルスを同定し,コクサッキーウイルスA型によつて発症したものと診断した.


The American review of respiratory disease | 2015

Role of HLA-DR antigens in Japanese patients with sarcoidosis.

Hiroshi Kunikane; Shousaku Abe; Yasuhiro Tsuneta; Tsuguyo Nakayama; Yasutaka Tajima; Jun Misonou; Akemi Wakisaka; Miki Aizawa; Yoshikazu Kawakami

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