Keigo Okamura
Gunma University
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Publication
Featured researches published by Keigo Okamura.
International Journal of Urology | 2000
Kiyotaka Tsuchiya; Hiroyuki Jinbo; Makoto Kurita; Kazuhisa Matsumoto; Keigo Okamura; Tatsuya Uchida; Mikio Kobayashi; Hidetoshi Yamanaka; Shirou Sugihara
Abstract Background : Because incidental detection of small renal cell cancers (RCC) has recently become increasingly common, nephron‐sparing surgery for these cases has been more widely performed. Renal cell cancer was investigated by means of step‐sectioning in order to determine which cases were suitable for nephron‐sparing surgery and how it should be performed.
The Japanese Journal of Urology | 2016
Kyoko Baba; Yoshitaka Sekine; Sota Kurihara; Hidekazu Koike; Hiroshi Matsui; Haruki Nakazato; Yasuhiro Shibata; Kazuto Ito; Kazuhiro Suzuki; Masahiro Nishii; Toru Mashimo; Keigo Okamura; Junko Hirato
A 25-year-old man with a left testicular tumor underwent a high inguinal orchiectomy. Histopathological examination of the resected specimen revealed tumors of more than one histological type, mixed forms (seminoma, immature teratoma). Further evaluation revealed no metastasis (pT1N0M0S1 Stage IS).Four months after orchiectomy, alpha-fetoprotein (AFP) was elevated.CT scan revealed retroperitoneal masses of recurrent tumor. Although the AFP returned to normal level after four courses of BEP (bleomycin, etoposide and cisplatin), the retroperitoneal lymph nodes continued to grow. He underwent excision of the retroperitoneal lymph node dissection. Histopathological examination of the resected specimen revealed mature teratoma.Few reports examined about the development mechanism of growing teratoma syndrome (GTS). We considered that the development mechanism of GTS in this case is induction of differentiation. In this case report, we discuss the development mechanism of GTS based on bibliographical consideration.
The Journal of Urology | 2004
Kazuhisa Matsumoto; Kazuhiro Suzuki; Hidekazu Koike; Keigo Okamura; Kiyotaka Tsuchiya; Tatsuya Uchida; Yutaka Takezawa; Yoshitatsu Fukabori; Mikio Kobayashi; Hidetoshi Yamanaka
BACKGROUND Angiogenesis plays important roles in pathogenesis in human cancer. We assessed the relationship between clinical features of renal cell cancer (RCC) and PlGF levels in relation to VEGF. MATERIALS AND METHODS Plasma PlGF and VEGF levels were measured in patients with renal cell cancer. The levels of these angiogenetic factors were analyzed in relation to clinical parameters. RESULTS PlGF and VEGF levels in patients with RCC were significantly higher than those in non-cancer controls. PlGF levels were significantly associated with histological grade and total tumor vascularity (TTV), and VEGF levels were significantly associated with T, M stage, histological grade, venous invasion and TTV. Multivariate analysis showed plasma PlGF was an independent prognostic factor. CONCLUSION These findings suggested that plasma PlGF levels were significantly associated with the clinical features of RCC, especially prognostic significance.
Anticancer Research | 2003
Kazuhisa Matsumoto; Kazuhiro Suzuki; Hidekazu Koike; Keigo Okamura; Kiyotaka Tsuchiya; Tatsuya Uchida; Yutaka Takezawa; Mikio Kobayashi; Hidetoshi Yamanaka
The Kitakanto Medical Journal | 2008
Keigo Okamura; Hidekazu Koike; Hiroshi Matsui; Kazuhiro Suzuki
Seibutsu Butsuri Kagaku | 1997
Fumiko Tsuchida; Toshio Tanaka; Norihiro Moriyama; Kenichiro Okada; Hiroyuki Jimbo; Keigo Okamura; Hidetoshi Yamanaka; Yuhsi Matuo
The Japanese Journal of Urology | 1991
Mikio Kobayashi; Yoshimi Tamura; Keigo Okamura; Seiji Nakata; Kyoichi Imai; Hidetoshi Yamanaka
The Journal of Urology | 2008
Hidekazu Koike; Keigo Okamura; Yoshitaka Sekine; Kazuhiro Suzuki
The Kitakanto Medical Journal | 2000
Takanori Suzuki; Yasuo Nakazawa; Kohei Kurokawa; Keigo Okamura; Isao Kurosawa; Hidetoshi Yamanaka
The Kitakanto Medical Journal | 1996
Takanori Suzuki; Kohei Kurokawa; Kazuhiro Suzuki; Keigo Okamura; Nobuaki Ohtake; Tadashi Yoshida; Susumu Kurita; Hiroshi Okazaki; Kyoichi Imai; Hidetoshi Yamanaka