Hirotoshi Kobayashi

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PURPOSE This study was designed to clarify indication and benefit of pelvic sidewall dissection for rectal cancer. METHODS The retrospective, multicenter study collected the data of rectal cancer patients who underwent surgery between 1991 and 1998 and were prospectively followed. RESULTS Of 1,977 patients with rectal cancers, 930 underwent pelvic(More)
PURPOSE Over recent years, patient outcomes after colon cancer resection have not improved to the same degree as for rectal cancer. Japanese D3 resection and European complete mesocolic excision (CME) with central vascular ligation (CVL) are both based on sound oncologic principles. Expert surgeons using both techniques report impressive outcomes as(More)
BACKGROUND The aim of this study was to clarify the characteristics of recurrence and the effectiveness of surveillance tools after curative resection for colorectal cancer. METHODS We enrolled 5230 consecutive patients (stage I, 1367; stage II, 1912; stage III, 1951) who underwent curative resection at 14 hospitals from 1991 to 1996. All patients were(More)
The present study aims to define the prognostic impact of the lymph node ratio (LNR) in patients with stage III distal rectal cancer. We analyzed data from 501 patients who underwent curative resection (total mesorectal excision, TME) for stage III distal rectal cancer at 12 institutions between 1991 and 1998. Patients were divided into four groups(More)
BACKGROUND In the TNM classification of colorectal carcinoma, N-staging is dependent on the number of metastases; in the Japanese classification system, staging usually has been based on the distribution of metastases (N1, paracolic; N2, along the major vessels; N3, at the root of major vessels). The aim of our study was to examine whether the concept of(More)
PURPOSE The goal of this retrospective multicenter study was to investigate the efficacy of pelvic sidewall dissection for lower rectal cancer. METHODS Data from 1,272 consecutive patients who underwent total mesorectal excision for lower rectal cancer in 12 institutions from 1991 through 1998 were reviewed. The rates of local recurrence and survival in(More)
Because the rate of recurrence after curative resection for T1 colorectal cancer is low, the characteristics of recurrence remain obscure. This multicenter study attempted to clarify the characteristics of recurrence after curative resection for T1 colorectal cancer. We analyzed the associations between recurrence and various clinicopathological features in(More)
The goal of this multicenter study was to clarify the determinants of local excision for patients with T1–T2 lower rectal cancer. Data from 567 consecutive patients who underwent radical resection for T1–T2 lower rectal cancer at 12 institutions between 1991 and 1998 were reviewed. Rates of lymph node metastasis were investigated using a tree analysis,(More)
Right hemicolectomy is a very common procedure throughout the world, although this procedure is known to carry substantial surgical risks. The present study aimed to develop a risk model for right hemicolectomy outcomes based on a nationwide internet-based database. The National Clinical Database (NCD) collected records on over 1,200,000 surgical cases from(More)
It has been evident for a while that the result after resection for colon cancer may not have been optimal. Several years ago, this was showed by some leading surgeons in the USA but a concept of improving results was not consistently pursued. Later, surgeons in Europe and Japan have increasingly adopted the more radical principle of complete mesocolic(More)