Volume 6, Issue 7 pp. 1627-1638
Original Research
Open Access

The prediction models for postoperative overall survival and disease-free survival in patients with breast cancer

Daichi Shigemizu

Daichi Shigemizu

Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan

Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan

CREST, Japan Science and Technology Agency, Tokyo, Japan

Department for Medical Genome Sciences, Medical Genome Center, National Center for Geriatrics and Gerontology, Obu, Japan

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Takuji Iwase

Takuji Iwase

Department of Breast Surgical Oncology, Breast Oncology Center, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan

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Masataka Yoshimoto

Masataka Yoshimoto

Yoshimoto Breast Clinic, Tokyo, Japan

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Yasuyo Suzuki

Yasuyo Suzuki

First Department of Surgery, Sapporo Medical University, School of Medicine, Sapporo, Japan

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Fuyuki Miya

Fuyuki Miya

Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan

Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan

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Keith A Boroevich

Keith A Boroevich

Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan

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Toyomasa Katagiri

Toyomasa Katagiri

Division of Genome Medicine, Institute for Genome Research, Tokushima University, Tokushima, Japan

Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan

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Hitoshi Zembutsu

Hitoshi Zembutsu

Division of Genetics, National Cancer Center Research Institute, Tokyo, Japan

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Tatsuhiko Tsunoda

Corresponding Author

Tatsuhiko Tsunoda

Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan

Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan

CREST, Japan Science and Technology Agency, Tokyo, Japan

These authors should be considered co-corresponding authors.

Correspondence

Tatsuhiko Tsunoda, Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan. Tel: +81 3 5803 4175; Fax: +81 3 5803 0182; E-mail: [email protected]

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First published: 24 May 2017
Citations: 9
No funding information provided.

Abstract

The goal of this study is to establish a method for predicting overall survival (OS) and disease-free survival (DFS) in breast cancer patients after surgical operation. The gene expression profiles of cancer tissues from the patients, who underwent complete surgical resection of breast cancer and were subsequently monitored for postoperative survival, were analyzed using cDNA microarrays. We detected seven and three probes/genes associated with the postoperative OS and DFS, respectively, from our discovery cohort data. By incorporating these genes associated with the postoperative survival into MammaPrint genes, often used to predict prognosis of patients with early-stage breast cancer, we constructed postoperative OS and DFS prediction models from the discovery cohort data using a Cox proportional hazard model. The predictive ability of the models was evaluated in another independent cohort using Kaplan–Meier (KM) curves and the area under the receiver operating characteristic curve (AUC). The KM curves showed a statistically significant difference between the predicted high- and low-risk groups in both OS (log-rank trend test P = 0.0033) and DFS (log-rank trend test P = 0.00030). The models also achieved high AUC scores of 0.71 in OS and of 0.60 in DFS. Furthermore, our models had improved KM curves when compared to the models using MammaPrint genes (OS: P = 0.0058, DFS: P = 0.00054). Similar results were observed when our model was tested in publicly available datasets. These observations indicate that there is still room for improvement in the current methods of predicting postoperative OS and DFS in breast cancer.

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