Japanese Journal of Clinical Oncology Advance Access originally published online on November 22, 2005
Japanese Journal of Clinical Oncology 2005 35(12):714-719; doi:10.1093/jjco/hyi194
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© 2005 Foundation for Promotion of Cancer Research
Biological Markers as a Predictor for Response and Prognosis of Unresectable Gastric Cancer Patients Treated with Irinotecan and Cisplatin
1 Division of Digestive Endoscopy and Gastrointestinal Oncology, National Cancer Center Hospital East, 2 Pathology Division, National Cancer Center Research Institute East, Kashiwa, Chiba, 3 Department of Internal Medicine, Misawa City Hospital, Aomori, 4 Department of Medicine, Yamagata Prefectural Central Hospital, Yamagata, 5 Department of Medicine, Saku General Hospital, Nagano, 6 Department of Internal Medicine, National Shikoku Cancer Center, Matsuyama and 7 Health Service, Kyoto University, Kyoto, Japan
For reprints and all correspondence: Fumio Nagashima, MD, Department of Clinical Oncology, Saitama Medical School, 38 Morohongo, Moroyamama, Iruma-gun, Saitama, 350-0495, Japan. E-mail: fnagashi{at}saitama-med.ac.jp
Received June 23, 2005; accepted October 9, 2005
Background: Previously we reported that immunohistochemical examination of p53, bcl-2, glutathione S-transferase-
(GST-
), thymidylate synthase (TS) and vascular endothelial growth factor (VEGF) in biopsy samples was a useful method for predicting clinical outcome of gastric cancer patients treated with 5-fluorouracil and cisplatin. Here, we investigated if these biological markers can predict chemoresponse and survival of unresectable gastric cancer patients treated with irinotecan and cisplatin.
Methods: The subjects were 55 unresectable gastric cancer patients treated with irinotecan (70 mg/m2, Days 1 and 15) and cisplatin (80 mg/m2, Day 1). Expression of p53, bcl-2, VEGF was examined immunohistochemically in biopsy samples.
Results: The overall response rate and the median survival time were 55% (30/55) and 321 days, respectively. Thirty patients with intestinal-type adenocarcinoma survived longer than 25 patients with diffuse-type (median survival time: 446, 259 days, P = 0.013). The favorable phenotypes for chemoresponse were p53-negative, bcl-2-negative and VEGF-positive, which were in accordance with previous findings. The response rate was significantly correlated with the total number of these favorable phenotypes (P = 0.043). The 39 patients having 2 or 3 favorable phenotypes (p53-negative, bcl-2-negative and VEGF-positive) survived longer than the remaining 16 patients (median survival time: 444, 259 days, P = 0.021). In the Cox model, the number of the favorable phenotypes showed a tendency to correlate with survival after adjustment for potentially prognostic factors such as histological type or performance status (P = 0.070).
Conclusions: Immunohistochemical examination of biological markers may be useful in predicting the clinical outcome of unresectable gastric cancer patients treated with irinotecan and cisplatin.
Key Words: gastric cancer chemotherapy p53 bcl-2 VEGF
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