【名词&注释】
消化道(digestive tract)、碘造影剂(iodic contrast medium)、静脉曲张(varicose veins)、硬化剂治疗(endoscopic variceal sclerotherapy)、癌细胞(cancer cell)、中晚期胃癌(medium and advanced gastric cancer)
[填空题]早期胃癌是指癌细胞(cancer cell)浸润至胃壁的(),中晚期胃癌(medium and advanced gastric cancer)浸润至()、()。