直肠间质瘤的诊断和治疗
Diagnosis and treatment of rectal stromal tumor
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摘要:
胃肠道间质瘤(GIST)是一组独立起源于胃肠道间质干细胞的肿瘤,由未分化或多能的梭形或上皮样细胞组成,属于消化道间叶性肿瘤。直肠间质瘤大部分位于直肠中下段,影像学检查呈现外生性生长,占GIST的5%。因其起病隐匿,缺乏典型的临床表现,易被漏诊或误诊,常需联合CD117和CD34免疫组织化学染色检测和病理检查才能确诊。手术切除是局部原发性直肠间质瘤的首选治疗,术中需注意保持肿瘤包膜的完整性,不行常规淋巴结清扫。分子靶向药物甲磺酸伊马替尼常作为术前和术后的辅助治疗药物。然而,由于直肠间质瘤临床少见,目前尚无统一的治疗规范,其治疗策略的选择仍需进一步研究验证。
Abstract:Gastrointestinal stromal tumor (GIST) is a group of tumors which is independently derived from the mesenchymal stem cells of the digestive tract, and consists of undifferentiated or multi functional spindle or epithelioid cells. Most of the rectal stromal tumor located at the middle or lower part of the rectum, and presented with exogenous growth outside of the rectum cavity. Rectal stromal tumor accounted for 5% of GIST. Rectal stromal tumor is easily missed or misdiagnosed because of insidious onset and non typical clinical manifestations. The diagnosis of rectal stromal tumor relies on immunohistochemical staining (CD117 and CD34) and pathological examination. Surgical resection is the first choice for the treatment of local primary rectal stromal tumor. Protection of the integrity of the tumor is important during operation, and routine lymph node dissection is not recommended. Molecular targeted drug mesylate imatinib is adopted in the pre and postoperative adjuvant therapy. However, due to the rarity of rectal stromal tumor, the treatment strategies need further investigation.