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Erschienen in: Annals of Surgical Oncology 4/2012

01.04.2012 | Colorectal Cancer

Radiation-Induced Apoptosis of Peripheral Blood Lymphocytes is Correlated with Histological Regression of Rectal Cancer in Response to Preoperative Chemoradiotherapy

verfasst von: Soichiro Ishihara, MD, PhD, Hisae Iinuma, PhD, Yoshihisa Fukushima, MD, Takuya Akahane, MD, Atsushi Horiuchi, MD, Ryu Shimada, MD, Hajime Shibuya, MD, PhD, Tamuro Hayama, MD, PhD, Hideki Yamada, MD, PhD, Keijiro Nozawa, MD, PhD, Keiji Matsuda, MD, PhD, Toshiaki Watanabe, MD, PhD

Erschienen in: Annals of Surgical Oncology | Ausgabe 4/2012

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Abstract

Purpose

The response of rectal cancer to preoperative chemoradiotherapy (PRT) varies widely among patients, and predictors of the response remain to be elucidated. The purpose of this study is to investigate whether radiation-induced apoptosis (RIA) of peripheral blood lymphocytes (PBLs) reflects the underlying intrinsic radiosensitivity of rectal cancer.

Methods

Forty-one patients with clinical T3-4, M0 low rectal cancers, treated with PRT and curative surgery, were retrospectively studied. PBLs were obtained from blood samples of the patients, irradiated at 0, 2, 8, and 16 Gy in vitro, and analyzed for RIA by flow cytometry using Annexin V (AV) and propidium iodide (PI). The correlation of the RIA of PBLs and histological regression of rectal cancer in response to PRT was examined.

Results

Both the proportions of AV+/PI− PBLs (early apoptosis) and AV+/PI + PBLs (late apoptosis) were significantly higher in patients with high histological regression than in those with low histological regression. Age, sex, tumor size, and clinical T and N stages did not affect the RIA of PBLs.

Conclusions

This study showed that the RIA of PBLs is correlated with the histological regression of rectal cancer in response to PRT and suggested that the radiosensitivity of rectal cancer might be estimated by the RIA of PBLs.
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Metadaten
Titel
Radiation-Induced Apoptosis of Peripheral Blood Lymphocytes is Correlated with Histological Regression of Rectal Cancer in Response to Preoperative Chemoradiotherapy
verfasst von
Soichiro Ishihara, MD, PhD
Hisae Iinuma, PhD
Yoshihisa Fukushima, MD
Takuya Akahane, MD
Atsushi Horiuchi, MD
Ryu Shimada, MD
Hajime Shibuya, MD, PhD
Tamuro Hayama, MD, PhD
Hideki Yamada, MD, PhD
Keijiro Nozawa, MD, PhD
Keiji Matsuda, MD, PhD
Toshiaki Watanabe, MD, PhD
Publikationsdatum
01.04.2012
Verlag
Springer-Verlag
Erschienen in
Annals of Surgical Oncology / Ausgabe 4/2012
Print ISSN: 1068-9265
Elektronische ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-011-2057-9

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