Factors associated with prolonged time to treatment failure with fulvestrant 500 mg in patients with post-menopausal estrogen receptor-positive advanced breast cancer: a sub-group analysis of the JBCRG-C06 Safari study

Hidetoshi KawaguchiDepartment of Breast Surgery, Matsuyama Red Cross Hospital, Matsuyama, Japan; Correspondence[email protected]

Norikazu MasudaDepartment of Surgery, Breast Oncology, NHO Osaka National Hospital, Osaka, Japan;

Takahiro NakayamaDepartment of Breast and Endocrine Surgery, Osaka International Cancer Institute, Osaka, Japan;

Kenjiro AogiDepartment of Breast Oncology, Shikoku Cancer Center, Matsuyama, Japan;

Keisei AnanDepartment of Surgery, Kitakyushu Municipal Medical Center, Kitakyushu, Japan;

Yoshinori ItoDepartment of Breast Medical Oncology, The Cancer Institute Hospital of JFCR, Tokyo, Japan;

Shoichiro OhtaniDepartment of Breast Surgery, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan;

Nobuaki SatoDepartment of Breast Oncology, Niigata Cancer Center Hospital, Niigata, Japan;

Shigehira SajiDepartment of Medical Oncology, Fukushima Medical University, Fukushima, Japan;

Toshimi TakanoDepartment of Medical Oncology, Toranomon Hospital, Tokyo, Japan;

Eriko TokunagaDepartment of Breast Oncology, Kyushu Cancer Center, Fukuoka, Japan;

Seigo NakamuraDepartment of Surgery, Division of Breast Surgical Oncology, Showa University School of Medicine, Tokyo, Japan;

Yoshie HasegawaDepartment of Breast Surgery, Hirosaki Municipal Hospital, Hirosaki, Japan;

Masaya HattoriDepartment of Breast Oncology, Aichi Cancer Center Hospital, Nagoya, Japan;

Tomomi FujisawaDepartment of Breast Oncology, Gunma Prefectural Cancer Center, Ohta, Japan;

Satoshi MoritaDepartment of Biomedical Statistics and Bioinformatics, Graduate School of Medicine, Kyoto University, Kyoto, Japan;

Miki YamaguchiDepartment of Breast Surgery, JCHO Kurume General Hospital, Kurume, Japan;

Hiroko YamashitaDepartment of Breast Surgery, Hokkaido University Hospital, Sapporo, Japan;

Toshinari YamashitaDepartment of Breast and Endocrine Surgery, Kanagawa Cancer Center, Yokohama, Japan;

Yutaka YamamotoDepartment of Breast and Endocrine Surgery, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan;

Daisuke YotsumotoDepartment of Breast Surgical Oncology, Hakuaikai Medical Corporation Sagara Hospital, Kagoshima, Japan;

Masakazu ToiDepartment of Breast Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan;

Shinji OhnoBreast Oncology Center, The Cancer Institute Hospital of JFCR, Tokyo, Japan

References