کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2161320 1090912 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molecular responses of rectal cancer to preoperative chemoradiation
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی تحقیقات سرطان
پیش نمایش صفحه اول مقاله
Molecular responses of rectal cancer to preoperative chemoradiation
چکیده انگلیسی

Background and purposeSome rectal cancers respond well to preoperative neoadjuvant therapy while others are inherently resistant or develop resistance during the treatment. To understand the mechanism underlying these differences, several markers that might be prognostic or predictive of downstaging in response to chemoradiotherapy in patients with rectal cancer were evaluated.Material and methodsThirty patients were enrolled in this study. All were treated with preoperative chemoradiation (45 Gy in 25 fractions + 5-FU). Paraffin-embedded sections obtained before and after therapy were stained by H&E, for COX-2, and Ki67. In addition, osteopontin and IL-6 concentrations were determined in blood samples obtained before, during, and after therapy.ResultsCOX-2 expression increased in 67% (n = 8/12) of the patients from a median of 0% before to 74% after therapy (p = 0.009). Ki67 median positivity diminished from 90% to 45% in 83% (n = 10/12) of cases (p = 0.007). Osteopontin expression showed no significant changes during therapy, whereas IL-6 expression levels increased in 70% (n = 19/27) of all patients (p < 0.001). For osteopontin and IL-6, patients with a complete response tended to have lower pre-therapy levels. Moreover, osteopontin was much higher before (p = 0.02) and after therapy (p = 0.01) in patients who later developed metastases.ConclusionsChemoradiotherapy seems to affect expression of COX-2 and Ki67 which indicates that these proteins might be of importance in predicting long-term outcome. Moreover, osteopontin might be a marker of metastases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiotherapy and Oncology - Volume 80, Issue 2, August 2006, Pages 172–177
نویسندگان
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