Endorectal ultrasonography and treatment of early stage rectal cancer

The purpose of this study was to evaluate the accuracy of preoperative stag ing by endorectal ultrasonography (EUS) and its contribution to treatment o f early stage rectal cancer (ESRC). The results of EUS for 154 consecutive patients with ESRC (pTis to pT2) were compared prospectively with histologi c findings, assessed according to the TNM classification. Results of treatm ent selection and long-term outcomes were analyzed retrospectively. There w ere 35 patients histologically staged as pTis, 8 as pT1-slight (invasion co nfined to the superficial one-third of the submucosa), 37 as pT1-massive (i nvasion extending to the deeper submucosa), and 74 as pT2. The equipment us ed was an echoendoscope GF-UM2 or GF-UM3 (Olympus, Tokyo, Japan). Sensitivi ty/specificity/ overall accuracy rates for detection of slight submucosal i nvasion, massive submucosal invasion, and muscularis propria invasion were 99%/ 74%/96%, 98%/88%/97%, and 97%/93%/96%, respectively. Incidences of lym ph node metastasis in pTis, pTis to pT1-slight, pT1, pT1-massive, and pT2 c ases were 0%, 0%, 18%, 22%, and 30%, respectively. Incidences of lymph node metastasis in ESRCs staged by EUS (u) as uTis, uT1-slight, uT1-massive, uT 2, and uT3 by EUS were 0%, 0%, 26%, 36%, and 64%, respectively. Sensitivity , specificity, and overall accuracy rates for detection of positive nodes i n overall ESRCs were 53%, 77%, and 72%, respectively. Of the 43 patients wi th pTis to pT1-slight tumors, 22 underwent endoscopic polypectomy or local excision, 20 radical surgery, and 1 radical surgery after endoscopic polype ctomy due to vascular invasion. All these patients are alive and all but on e (who refused radical surgery due to vascular invasion after local excisio n and developed liver and lung metastases) are disease-free, Of the 37 pati ents with pT1-massive tumors, 34 underwent radical surgery and 3 transcoccy geal segmental resection. All these patients are alive disease-free except for one who died of peritoneal carcinomatosis after radical surgery. All pa tients with pT2 tumors underwent radical surgery. The overall 5-year surviv al rates for pTis, pT1, and pT2 cases were 100%, 98%, and 97%, respectively . EUS is an accurate method for evaluating invasion depth in ESRC. Patients with uTis or uT1-slight tumors staged by EUS are at low risk of positive n odes and good candidates for endoscopic polypectomy or local excision. Thos e with uT1-massive or uT2 lesions should be treated with a radical operatio n because of the high incidence of positive nodes.