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International Journal of Clinical Oncology

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01-12-2010 | Original Article

Improvement of long-term survival of colorectal cancer in Japanese-Americans of Hawaii from 1990 to 2001

Authors: Masaki Hata, Kazuhiro Sakamoto, Janine Doneza, Kenneth Sumida, Kiichi Sugimoto, Shun Ishiyama, Makoto Takahashi, Yutaka Kojima, Yuichi Tomiki, Junji Machi

Published in: International Journal of Clinical Oncology | Issue 6/2010

Abstract

Background

To compare the long-term survival of colorectal cancer (CRC) during two 6-year periods using patients with similar characteristics of the same ethnicity in Hawaii.

Methods

A retrospective review of Japanese-American patients in Hawaii with CRC surgically resected and followed more than 5 years in a single institution. Patients were divided into two groups by date that patients had surgery: Group 1; 1990–1995, and Group 2; 1996–2001 (introduction of newer chemotherapy, aggressive surgery for liver metastases including radiofrequency thermal ablation).

Results

A total of 344 patients in Group 1 (median age 69.5 years) and 330 patients in Group 2 (median age 71.7 years) were included. There were no differences between two groups in gender, age, anatomic site, carcinoembryonic antigen, tumor size, histologic grade, and TNM stage distribution, including pT, pN, and pM status. Overall 5-year survival rate difference approached significance between two groups (Group 1: 73.2% vs. Group 2: 78.9%; p = 0.097). Particularly, there was significant difference in stage IV patients (Group 1; 8.7% vs. Group 2: 26.0%; p = 0.030) and histologic grade 3 (Group 1; 41.67% vs. Group 2: 67.73%; p = 0.032). Subgroup analyses showed significant difference (p < 0.05) for more advanced cancers (larger tumor, node positive, metastatic disease, poorly differentiated cancer).

Conclusions

In this study of patients with the same ethnicity, the better survival outcome in latter (Group 2) patients suggests improvement of treatment, especially for patients with more advanced and metastatic cancer (stage IV).

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Title: Improvement of long-term survival of colorectal cancer in Japanese-Americans of Hawaii from 1990 to 2001
Authors: Masaki Hata
Kazuhiro Sakamoto
Janine Doneza
Kenneth Sumida
Kiichi Sugimoto
Shun Ishiyama
Makoto Takahashi
Yutaka Kojima
Yuichi Tomiki
Junji Machi
Publication date: 01-12-2010
Publisher: Springer Japan
Published in: International Journal of Clinical Oncology / Issue 6/2010
Print ISSN: 1341-9625
Electronic ISSN: 1437-7772
DOI: https://doi.org/10.1007/s10147-010-0103-4

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