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Dive into the research topics where Naoya Murase is active.

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Featured researches published by Naoya Murase.


Surgery Today | 1998

A clinicopathological investigation on superficial early invasive carcinomas of the colon and rectum

Satoshi Okabe; Takehiro Arai; Shoji Maruyama; Naoya Murase; Masahiro Tsubaki

Due to recent advances in endoscopic surgical techniques, it has now become possible to perform endoscopic resection of most early invasive carcinomas of the colon and rectum (EIC) even if the lesions have invaded the submucosa. In the present study, we investigated the microscopic characteristics of superficial EIC compared with protruding-type EIC, focusing particular attention on histological type, the presence or absence of vascular invasion, the extent of submucosal invasion, and other adverse prognostic factors, to establish appropriate treatment strategies. Our findings led us to conclude that: (1) most cases of EIC can be cured by endoscopic resection if their gross aspects are classified as type IIc, superficial depressed, or type IIa, superficial elevated; (2) colorectal resection with lymph node dissection should be performed first for type IIa+IIc EIC because these lesions are apt to be associated with a large number of adverse prognostic factors; (3) subsequent colorectal resection should be performed after initial endoscopic treatment of EIC if there are adverse prognostic indicators of metastasis in the endoscopically resected specimen, such as moderately or poorly differentiated adenocarcinoma, lymphatic invasion, venous invasion, or extensive submucosal invasion.


Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2000

Surgical Therapy for Colorectal Cancer Invading the Muscularis Propria.

Naoya Murase; Satoshi Okabe; Hiroshi Kuwabara; Masaru Udagawa; Shunrou Otukasa; Takehiro Arai; Syoji Maruyama; Hironori Yamashita; Takehisa Iwai

大腸mp癌治療法選択の指標を明らかにすべくmp癌手術症例58例を対象に浸潤度細分類 (mp1~3), sm癌との比較, 占居部位, 原癌死症例, リンパ節転移症例の検討を行い以下の結果を得た.(1) mp1で腫瘤型が多くmp2, 3で限局潰瘍型が多かった.(2) sm癌と比較するとmp癌はリンパ管侵襲が高度であったが, sm高度浸潤例とmp1の比較では差を認めなかった.(3) 結腸に比べ直腸で限局潰瘍型が多く, 静脈侵襲も高度で, 5年生存率も不良であった.(4) 原癌死7症例はmp2, mp3の直腸癌で, 非原癌死例に比べ腫瘍径が有意に大きかった.(5) 直腸mp癌のリンパ節転移を34例中7例に認めた. 転移例は全例Ra以下で, mp2の1例に側方転移を認めた. 以上より, mp1はsm癌に準じたD2郭清を基本とした手術, mp2, mp3は適宜D3郭清を追加し, 特にRa以下のmp2, mp3はss (a1) 以深の進行癌と同様の対処が必要であると考えられた.


Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 1991

A Comparative Study on Retrospective Evaluation of the Prognosis of the Colorectal Calcinomas Using New TNM and General Classifications.

Masahiro Tsubaki; Katsuji Takemura; Masayuki Ando; Masanori Tada; Hironori Yamashita; Yasushi Wada; Naoya Murase

昭和49年から62年までに切除された大腸癌258例を対象に, 1987年に改定された新TNM分類と現行の大腸癌取扱い規約の2つの分類に沿ってretrospectiveに病期分類を行い.2つの分類法の特徴について検討した.その結果, 新TNM分類による生存率曲線は比較的バランスのよい形を保って下降していた.亜分類された各深達度の5生率には余り差がなく, pN1, pN2, 3の間の5生率には統計学的有道差が得られた.規約分類による生存率曲線ではstage III, IVの曲線が近接していた.またsinomoの5生率は85.7%と良好でn1とn2の5生率は52.3%, 64.1%と逆転していた.Dukes分類に準じた新TNM分類は大腸癌の予後を良く反映していたが, リンパ節の転移度は病期に反映させるべきであろうと思われた.規約分類のstage III, IVの分類法には臨床的限界があり, 特にリンパ節の分類法は再検討されるべきであった.


Nippon Daicho Komonbyo Gakkai Zasshi | 2001

Anorectal Signet-ring Cell Carcinoma Associated With Anal Fistula in Crohn's Disease: Report of a Case

Hiroshi Kuwabara; Satoshi Okabe; Hideaki Tanami; Toshiaki Ishikawa; Toshiaki Fukahara; Masaru Udagawa; S. Otsukasa; Takehiro Arai; Shouji Maruyama; Naoya Murase; Hironori Yamashita; Takehisa Iwai


Journal of medical and dental sciences | 2001

Clinicopathological Study of Mucous Pooling Referred to as Mucinous Component (MUC) in Colorectal Submucosal Invasive Carcinomas

Satoshi Okabe; Toshiaki Ishikawa; Shuurou Tanami; Hiroshi Kuwabara; Toshiaki Fukahara; Masaru Udagawa; Shunrou Ootsukasa; Takehiro Arai; Shouji Maruyama; Naoya Murase; Hironori Yamashita; Takehisa Iwai


Journal of medical and dental sciences | 2002

Investigation into the usefulness and adverse events of CDDP, 5-FU and dl-Leucovorin (PFL-therapy) for advanced colorectal cancer

Satoshi Okabe; Toshiaki Ishikawa; Hideaki Tanami; Hiroshi Kuwabara; Toshiaki Fukahara; Masaru Udagawa; Shunrou Ootsukasa; Takehiro Arai; Shouji Maruyama; Naoya Murase; Hironori Yamashita; Takehisa Iwai


Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 1997

Small Carcinoid Tumor of the Rectum with Lymph Node Metastasis, Report of a Case.

Shoji Maruyama; Satoshi Okabe; Takehiro Arai; Munenari Lee; Naoya Murase; Masahiro Tsubaki


Acta Gastro-Enterologica Belgica | 2002

A CASE OF RECTOVAGINO-VESICAL FISTULA DUE TO RADIATION THERAPY FOR UTERINE CANCER TREATED WITH COVERED EXPANDABLE METALLIC STENT

Shunroh Ohtsukasa; Satoshi Okabe; Hideaki Tanami; Toshiaki Fukahara; Hiroshi Kuwabara; Masaru Utagawa; Naoya Murase; Hironori Yamashita; Kenichi Sugihara; Takehisa Iwai


Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2001

Remnant Mucous Nodules after Endoscopic Mucosal Piecemeal Resection for Rectal Cancer, Report of a Case.

Toshiaki Fukahara; Satoshi Okabe; Hideaki Tanami; Hiroshi Kuwabara; Shunrou Otsukasa; Naoya Murase; Hironori Yamashita; Takehisa Iwai; Kenichi Sugihara


Journal of medical and dental sciences | 2001

Abdominosacral repair for a rectovaginal fistula with anastomotic stenosis after low anterior resection report of a case.

Satoshi Okabe; Toshiaki Ishikawa; Shuurou Tanami; Hiroshi Kuwabara; Toshiaki Hukahara; Masaru Udagawa; Shunrou Ootsukasa; Takehiro Arai; Shouji Maruyama; Naoya Murase; Hironori Yamashita; Takehisa Iwai

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Satoshi Okabe

Tokyo Medical and Dental University

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Takehiro Arai

Tokyo Medical and Dental University

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Hironori Yamashita

Tokyo Medical and Dental University

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Takehisa Iwai

Tokyo Medical and Dental University

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Masaru Udagawa

Tokyo Medical and Dental University

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Hiroshi Kuwabara

Tokyo Medical and Dental University

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Toshiaki Fukahara

Tokyo Medical and Dental University

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Shouji Maruyama

Tokyo Medical and Dental University

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Hideaki Tanami

Tokyo Medical and Dental University

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