Smith Joan C, Schäffer Michael W, Ballard Billy R, Smoot Duane T, Herline Alan J, Adunyah Samuel E, M'Koma Amosy E
Laboratory of Inflammatory Bowel Disease Research, Division of Biomedical Sciences, Department of Biochemistry and Cancer Biology, Meharry Medical College School of Medicine, Nashville, Tennessee.
J Cancer Ther. 2013;4(1):260-270. doi: 10.4236/jct.2013.41033.
The incidence of familial adenomatous polyposis (FAP) is one in 7,000 to 12,000 live births. Virtually, all surgically untreated patients with FAP inevitably develop colorectal-cancer in their lifetime because they carry the adenomatous polyposis coli gene. Thus prophylactic proctocolectomy is indicated. Surgical treatment of FAP is still controversial. There are however, four surgical options: ileorectal anastomosis, restorative proctocolectomy with ileal pouch-anal anastomosis, proctocolectomy with ileostomy, and proctocolectomy with continent-ileostomy. Conventional proctocolectomy options largely lie between colectomy with ileorectal anastomosis or ileal pouch-anal anastomosis. Detractors of ileal pouch-anal anastomosis prefer ileorectal anastomosis because of better functional results and quality of life. The functional outcome of total colectomy with ileorectal anastomosis is undoubtedly far superior to that of the ileoanal pouch; however, the risk for rectal cancer is increased by 30%. Even after mucosectomy, inadvertent small mucosal residual islands remain. These residual islands carry the potential for the development of subsequent malignancy. We reviewed the literature (1975-2012) on the incidence, nature, and possible etiology of subsequent ileal-pouch and anal transit zone adenocarcinoma after prophylactic surgery procedure for FAP. To date there are 24 studies reporting 92 pouch-related cancers; 15 case reports, 4 prospective and 5 retrospective studies. Twenty three of 92 cancers (25%) developed in the pouch mucosa and 69 (75%) in anal transit zone (ATZ). Current recommendation for pouch surveillance and treatment are presented. Data suggest lifetime surveillance of these patients.
家族性腺瘤性息肉病(FAP)的发病率为每7000至12000例活产中有1例。实际上,所有未经手术治疗的FAP患者在其一生中都不可避免地会患上结直肠癌,因为他们携带腺瘤性息肉病大肠杆菌基因。因此,需要进行预防性直肠结肠切除术。FAP的手术治疗仍存在争议。然而,有四种手术选择:回肠直肠吻合术、带回肠贮袋肛管吻合术的恢复性直肠结肠切除术、带回肠造口术的直肠结肠切除术以及带可控回肠造口术的直肠结肠切除术。传统的直肠结肠切除术选择主要介于结肠切除术加回肠直肠吻合术或回肠贮袋肛管吻合术之间。回肠贮袋肛管吻合术的反对者更倾向于回肠直肠吻合术,因为其功能效果和生活质量更好。结肠切除术加回肠直肠吻合术的功能结果无疑远优于回肠肛管贮袋;然而,患直肠癌的风险会增加30%。即使在黏膜切除术后,仍会有不经意残留的小黏膜岛。这些残留岛有发展为后续恶性肿瘤的可能性。我们回顾了1975年至2012年关于FAP预防性手术术后回肠贮袋和肛管移行区腺癌的发病率、性质及可能病因的文献。迄今为止,有24项研究报告了92例与贮袋相关的癌症;15例病例报告、4项前瞻性研究和5项回顾性研究。92例癌症中有23例(25%)发生在贮袋黏膜,69例(75%)发生在肛管移行区(ATZ)。文中给出了目前关于贮袋监测和治疗的建议。数据表明需要对这些患者进行终身监测。