Dr. Zhang Rong is mainly engaged in the endoscopic diagnosis and treatment of tumor and has abundant experience in the following aspects: EUS tumor diagnosis and EUS-guided interventional diagnosis & treatment; early diagnosis of general tumors and especially gastrointestinal tract cancer; endoscopic treatment of early cancer, precancerous lesions and benign tumors (loop ligature, EMR, ESD, etc.); endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) biopsy; endoscopic palliative treatment of advanced gastrointestinal tract cancer and respiratory tract tumor (including stent implantation, local drug injections, local implantation chemotherapy & radiotherapy seeds, EUS-guided neurolytic celiac plexus block, photodynamic therapy for tumor); combination therapy and biotherapy for tumors.