1 Department of Palliative Medicine (S.N., J.Y., K.K., A.I., M.H., K.I., Y.I., E.K. and T.M.), National Cancer Center Hospital East, Kashiwa, Japan.
2 Department of Palliative Medicine (S.N., J.Y., K.K., A.I., M.H., K.I., Y.I., E.K. and T.M.), National Cancer Center Hospital East, Kashiwa, Japan; Division of Biomarker Discovery (T.M.), Exploratory Oncology Research and Clinical Trial Center, National Cancer Center Hospital East, Kashiwa, Japan. Electronic address: tomiura@east.ncc.go.jp.