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Ultra-Short Pulse Tracking by Using Wavelength Dispersion for a Short-Time Optical Buffer

光学学报 2003年第S1期23卷 601-602页

作者： tsuyoshi konishi Hideaki Furukawa Kousuke Asano Kazuyoshi Itoh Graduate School of Engineering Department of Material and Life Science Osaka University JAPANGraduate School of Engineering Department of Material and Life Science Osaka University JAPANGraduate School of Engineering Department of Material and Life Science Osaka University JAPANGraduate School of Engineering Department of Material and Life Science Osaka University JAPAN

To synchronize a control signal with a packet signal in response to changing timing jitter, we investigate ultra-short pulse tracking by using wavelength dispersion for a short-time optical buffer in an optical router.

关键词： for on in by Ultra-Short Pulse Tracking by Using Wavelength Dispersion for a Short-Time Optical Buffer

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Crosstalk Suppression in Header Recognition Unit Using Time-Space Conversion

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光学学报 2003年第S1期23卷 633-634页

作者： Hideaki Furukawa tsuyoshi konishi Yoshinori Oshita Kazuyoshi Itoh Yoshiki Ichioka Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.

We demonstrate a suppression effect of a crosstalk among a target and similar header signals using the header recognition filter designed by a design technique of the multiple-object discriminant filter.

关键词： in it et of that with As be

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Preoperative chemoradiation and extended pelvic lymphadenectomy for rectal cancer:Two distinct principles

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World Journal of Gastrointestinal Surgery 2010年第4期2卷 95-100页

作者： tsuyoshi konishi Toshiaki Watanabe Hirokazu Nagawa Masatoshi Oya Masashi Ueno Hiroya Kuroyanagi Yoshiya Fujimoto Takashi Akiyoshi Toshiharu Yamaguchi Tetsuichiro Muto Department of Gastroenterological Surgery Cancer Institute HospitalTokyo135-8550Japan Department of Surgical Oncology University of TokyoTokyo113-8655Japan Department of Surgery Teikyo University School of MedicineTokyo173-8605Japan

Extended pelvic lymphadenectomy(EPL) with total mesorectal excision(TME) has been reported to provide oncological benefit in lower rectal cancer in Japan.In Western countries EPL is not widely accepted because of frequent morbidity but instead preoperative chemoradiation(CRT) followed by TME has been established as a standard treatment for decreasing local recurrence.Recently,several studies have focused on the comparison between these two distinct therapeutic approaches in Western countries and Japan.A study comparing Dutch trial data and Japanese data revealed that EPL and RT are almost equivalent in decreasing local recurrence in lower rectal cancer as compared with TME alone.Considering that almost 45 survival can be achieved by EPL even in the presence of metastatic lateral lymph nodes(LLNs),EPL performed by experienced surgeons definitely contributes to decrease local recurrence.On the other hand,a randomized controlled trial in Japan that compared EPL with conventional TME following preoperative RT revealed that EPL is associated with a higher frequency of sexual and urinary dysfunction without oncological benefits in the presence of preoperative RT.On this point,preoperative CRT followed by conventional TME without EPL would be a better therapeutic approach in patients without evident metastatic LLNs.For future treatment,it would be desirable to have a narrower indication for EPL using full advantage of recent improvement in image diagnosis.Although objective comparison of these two principles between Japan and the West is difficult due to differences in patient groups,further studies would lead to the next great step towards future improvement in treating lower rectal cancer.

关键词： Rectal cancer Extended lymphadenectomy Chemoradiation Pelvic lymph node Lateral lymph node

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Recurrent colorectal cancer after endoscopic resectionwhen additional surgery was recommended

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World Journal of Gastroenterology 2016年第7期22卷 2336-2341页

作者： Yukiko Takatsu Yosuke Fukunaga Shunsuke Hamasaki Atsushi Ogura Jun Nagata Toshiya Nagasaki,Takashi Akiyoshi tsuyoshi konishi Yoshiya Fujimoto Satoshi Nagayama Masashi Ueno Department of Gastroenterological Surgery Cancer Institute HospitalJapanese Foundation for Cancer ResearchTokyo 135-8550Japan

AIM: To evaluate the type of recurrence after endoscopic resection in colorectal cancer patients and whether rescue was possible by salvage operation.METHODS: Among 4972 patients who underwent surgical resection at our institution for primary or recurrent colorectal cancers from January 2005 to February 2015, we experienced eight recurrent colorectal cancers after endoscopic resection when additional surgical resection was recommended.RESULTS: The recurrence patterns were: intramural local recurrence(five cases), regional lymph node recurrence(three cases), and associated with simultaneous distant metastasis(three cases). Among five cases with lymphatic invasion observed histologically in endoscopic resected specimens, four cases recurred with lymph node metastasis or distant metastasis. All cases were treated laparoscopically and curative surgery was achieved in six cases. Among four cases located in the rectum, three cases achieved preservation of the anus. Postoperative complications occurred in two cases(enteritis).CONCLUSION: For high-risk submucosal invasive colorectal cancers after endoscopic resection, additional surgical resection with lymphadenectomy is recommended, particularly in cases with lymphovascular invasion.

关键词： Colorectal neoplasms Colorectal surgery Laparoscopy Endoscopy Recurrence

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Treatment of colorectal carcinoids:A new paradigm

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World Journal of Gastrointestinal Surgery 2010年第5期2卷 153-156页

作者： tsuyoshi konishi Toshiaki Watanabe Hirokazu Nagawa Masatoshi Oya Masashi Ueno Hiroya Kuroyanagi Yoshiya Fujimoto Takashi Akiyoshi Toshiharu Yamaguchi Tetsuichiro Muto Department of Gastroenterological Surgery Cancer Institute Hospital Department of Surgical Oncology University of Tokyo Department of Surgery Teikyo University School of Medicine

It is often difficult to evaluate the grade of malignancy and choose an appropriate treatment for colorectal carcinoids in clinical settings. Although tumor size and depth of invasion are evidently not enough to stratify the risk of this rare tumor, the present guidelines or staging systems do not mention other clinicopathological variables. Recent studies, however, have shed light on the impact of lymphovascular invasion on the outcome of colorectal carcinoids. It has been revealed that the presence of lymphovascular invasion was among the strongest risk factors for metastasis along with tumor size and depth of invasion. Furthermore, tumors smaller than 1 cm, within submucosal invasion and without lymphovascular invasion, carry minimal risk for metastasis with 100% 5-year survival in the studies from Japan as well as from the USA. This would suggest that these tumors could be curatively treated by endoscopic resection or transanal local excision. On the other hand, colorectal carcinoids with either lymphovascular invasion or tumor size larger than 1 cm carry the risk for metastasis equivalent to adenocarcinomas. Therefore, it should be emphasized that histological examination of lymphovascular invasion is mandatory in the specimens obtained by endoscopic resection or transanal local excision, as this would provide useful information for determining the need for additional radical surgery with regional lymph node dissection. Although the present guidelines or TNM staging system do not mention the impact of lymphovascular invasion, this would be among the next promising targets in order to establish better guidelines and staging systems, particularly in early-stage colorectal carcinoids.

关键词： Lymphovascular invasion Neuroendocrine tumor Carcinoid Colorectal cancer

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