S-1 Supporting Information Non-invasively Imaging Subcutaneous Tumor Xenograft by Handheld Raman Detector with Assistance of Optical Clearing Agent Yunfei Zhang a , Haoran Liu a , Jiali Tang b , Zhuoyun Li a , Xingyu Zhou a , Ren Zhang c , Liang Chen d , Ying Mao d * and Cong Li a * a Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai 201203, China b Department of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 210009, China c Center of Analysis and Measurement, Fudan University, Shanghai 200433, China d Department of Neurosurgery, Huashan Hospital, Fudan University, 12 Wulumuqi Middle Road, Shanghai 200040, China *Corresponding Author: *E-mail: congli@fudan.edu.cn *E-mail: maoying@fudan.edu.cn