Nationwide implementation of laparoscopic surgery for colon cancer: short-term outcomes and long-term survival in a population-based cohort.

BACKGROUND: Randomized trials show similar outcomes after open surgery and laparoscopy for colon cancer, and confirmation of outcomes after implementation in routine practice is important. While some studies have reported long-term outcomes after laparoscopic surgery from single institutions, data from large patient cohorts are sparse. We investigated short- and long-term outcomes of laparoscopic and open surgery for treating colon cancer in a large national cohort. METHODS: We retrieved data from the Norwegian Colorectal Cancer Registry for all colon cancer resections performed in 2007-2010. Five-year relative survival rates following laparoscopic and open surgeries were calculated, including excess mortality rates associated with potential predictors of death. RESULTS: Among 8707 patients with colon cancer that underwent major resections, 16 % and 36 % received laparoscopic procedures in 2007 and 2010, respectively. Laparoscopic procedures were most common in elective surgeries for treating stages I-III, right colon, or sigmoid tumours. The conversion rate of laparoscopic procedures was 14.5 %. Among all patients, laparoscopy provided higher 5-year relative survival rates (70 %) than open surgery (62 %) (P = 0.040), but among the largest group of patients electively treated for stages I-III disease, the approaches provided similar relative survival rates (78 vs. 81 %; P = 0.535). Excess mortality at 2 years post-surgery was lower after laparoscopy than after open surgery (excess hazard ratio, 0.7; P = 0.013), but similar between groups during the last 3 years of follow-up. Major predictors of death were stage IV disease, tumour class pN+, age > 80 years, and emergency procedures (excess hazard ratios were 5.3, 2.4, 2.1, and 2.0, respectively; P < 0.001). CONCLUSION: Nationwide implementation of laparoscopic colectomy for colon cancer was safe and achieved results comparable to those from previous randomized trials.

Nationwide improvement of rectal cancer treatment outcomes in Norway, 1993-2010.

BACKGROUND: The Norwegian Rectal Cancer Project was initated in 1993 with the aims of improving surgery, decreasing local recurrence rates, improving survival, and establishing a national rectal cancer registry. Here we present results from the Norwegian Colorectal Cancer Registry (NCCR) from 1993 to 2010. MATERIAL AND METHODS: A total of 15 193 patients were diagnosed with rectal cancer in Norway 1993-2010, and were registered with clinical data regarding diagnosis, treatment, locoregional recurrences and distant metastases. Of these, 10 796 with non-metastatic disease underwent tumour resection. The results were stratified into five time periods, and the treatment outcomes were compared. Recurrence rates are presented for the 9785 patients who underwent curative major resection (R0/R1). RESULTS: Among all 15 193 patients, relative five-year survival increased from 54.1% in 1993-1997 to 63.4% in 2007-2010 (p < 0.001). Among the 10 796 patients with stage I-III disease who underwent tumour resection, from 1993-1997 to 2007-2010, relative five-year survival improved from 71.2% to 80.6% (p < 0.001). An increasing proportion of these patients underwent surgery at large-volume hospitals; and 30- and 100-day mortality rates, respectively, decreased from 3.0% to 1.4% (p < 0.001) and from 5.1% to 3.0% (p < 0.011). Use of preoperative chemoradiotherapy increased from 6.5% in 1993 to 39.0% in 2010 (p < 0.001). Estimated local recurrence rate after major resection (R0/R1) decreased from 14.5% in 1993-1997 to 5.0% in 2007-2009 (p < 0.001), and distant recurrence rate decreased from 26.0% to 20.2% (p < 0.001). CONCLUSION: Long-term outcomes from a national population-based rectal cancer registry are presented. Improvements in rectal cancer treatment have led to decreased recurrence rates of 5% and increased survival on a national level.

Prognostic groups in 1,676 patients with T3 rectal cancer treated without preoperative radiotherapy.

PURPOSE: The use of preoperative radiotherapy in patients with T3 tumors shows considerable variation among countries and institutions. The Norwegian guidelines have been very restrictive, limiting the indication to T4. This study was designed to identify subgroups of patients with T3 tumors with presumed high risks on adverse outcome and to use these results to reevaluate the national guidelines for preoperative radiotherapy. METHODS: This was a national cohort study of 2,460 patients with pT3 rectal adenocarcinoma, undergoing major surgery without preoperative radiotherapy from November 1993 to December 2002. Circumferential resection margin in millimeters was given for 1,676 patients. RESULTS: Multivariate analyses identified circumferential resection margin and nodal status as independent prognostic factors for local recurrence, metastases, and overall mortality. Analyses based on 12 combinations of N stage and circumferential resection margin showed that the estimated five-year rate of local recurrence increased from 11.1 percent (circumferential resection margin >3 mm; N0) to 36.5 percent (circumferential resection margin < or =1 mm; N2). The rate of distant metastases increased from 18.5 to 77.7 percent and the five-year survival decreased from 68.6 to 25.7 percent, respectively. CONCLUSIONS: There is great variation in outcome for patients with T3 cancers, and the outcome is not acceptable for the groups of patients with circumferential resection margin <3 mm or involved lymph nodes. These groups should be considered for neoadjuvant therapy.