Sintilimab Combined With Albumin‐Bound Paclitaxel and SOX Regimen as Conversion Therapy for Unresectable Advanced Gastric Cancer Achieving Complete Remission: A Case Report and Literature Review - Yufan Tang; Boquan Zhou; Bingbing Wen; Ke Yu; Jiajia Jia; Ying Sha; Jixiang Liu; Luyao Li; Ruifang Fan (Clinical Case Reports, 2026)