Abstract 105P
Background
This study aimed to evaluate the safety and efficacy of neoadjuvant tislelizumab combined with chemoradiotherapy in patients with resectable esophageal squamous cell cancer.
Methods
This is a prospective single-arm clinical trial. A total of 19 patients with newly diagnosed resectable esophageal cancer (cT1-2N+ / cT3-4aN0-3 M0) received 2 cycles of tislelizumab (200mg every 3 weeks for 2 cycles) concurrent with chemoradiotherapy (radiotherapy: 41.4Gy in 23 fractions; chemotherapy: Paclitaxel (Albumin bound) 100mg/m2, and Cisplatin 75 mg/m2 once every 3 weeks for 2 cycles.) Radical esophagectomy was performed within 4-6 weeks after neoadjuvant therapy. PET/CT was performed at baseline and before surgery. Primary endpoints included pathological response rate (pCR) and major pathological response rate (MPR), the secondary endpoints were disease free survival and safety. Exploratory endpoints include molecular imaging research to further explore the factors affecting the efficacy of neoadjuvant therapy for esophageal cancer.
Results
Nineteen patients enrolled, all of whom received neoadjuvant tislelizumab combined with chemoradiotherapy. Seventeen patients underwent radical esophagectomy. One patient did not undergo radical chemoradiotherapy due to lymph node metastases after neoadjuvant therapy. One patient died of pneumonia before surgery. Among 17 patients who underwent surgery, R0 was 100% (17/17), 8 patients achieved pCR (47.1%), and 12 patients achieved MPR (70.6%). Most of treatment-related adverse event (TRAE) were grade 1-2, and the most common TRAE was anemia (15, 78.9%). The grade 3 TRAE included 1 leukopenia (5.3%), 1 neutropenia (5.3%), 1 liver damage (5.3%), and 1 elevated cardiac troponin T (5.3%). A significant decrease in SUVmax was observed in both pCR and no-pCR patients after treatment. Baseline SUVmax in no-pCR patients tended to be higher than pCR patients(p=0.0642).
Conclusions
Neoadjuvant tislelizumab combined with chemoradiotherapy for locally advanced ESCC has promising efficacy and good safety.
Clinical trial identification
NCT05323890.
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
All authors have declared no conflicts of interest.