title: The Mayo Clinic experience with surgical management, complications and outcome for patients with renal cell carcinoma and venous tumour thrombus.
abstract: OBJECTIVE
  To report the surgical management, complications and outcomes over three decades by tumour thrombus level for patients with renal cell carcinoma (RCC) and renal venous extension, as surgery is the most effective treatment.
  
  
  METHODS
  We assessed 540 patients who underwent surgical resection for RCC with renal venous extension between 1970 and 2000. Early and late surgical complications, including operative mortality, were compared with tumour thrombus level using the chi-square, Fisher's exact and Wilcoxon rank-sum tests. Cancer-specific survival was estimated using the Kaplan-Meier method and compared across tumour thrombus levels using log-rank tests.
  
  
  RESULTS
  There were 349 (64.6%) patients with level 0 thrombus and 191 (35.4%) with inferior vena cava thrombus, including 66 (12.2%) with level I, 77 (14.3%) with level II, 28 (5.2%) with level III, and 20 (3.7%) with level IV thrombus. Patients with a higher thrombus level had more early surgical complications (respectively for level 0 to IV, 8.6%, 15.2%, 14.1%, 17.9% and 30.0%, P < 0.001). However, there was no statistically significant difference in the incidence of late complications by thrombus level (P = 0.445). The incidence of any early surgical complication decreased from 13.4% for patients treated in 1970-1989 to 8.1% for those treated in 1990-2000 (P = 0.064); the respective operative mortality decreased from 3.8% to 2.0% (P = 0.260), and in patients with inferior vena cava thrombus, from 8.1% to 3.8% (P = 0.227). The respective duration of hospitalization decreased from a median of 8 to 7 days (P < 0.001) but the incidence of late complications increased significantly over time (P < 0.001.) Among patients with clear cell RCC, the respective estimated 5-year cancer-specific survival rates (Se, number still at risk) for patients with level 0 to IV thrombus were 49.1 (3.0)% (125), 31.7 (6.4)% (14), 26.3 (6.1)% (11), 39.4 (10.7)% (7) and 37.0 (12.9)% (5), (P = 0.028). There was a statistically significant difference in outcome for patients with level 0 vs those with level >0 thrombus (P = 0.002), but there was no significant difference in outcome by thrombus level among patients with inferior vena cava tumour thrombus (P = 0.868).
  
  
  CONCLUSIONS
  The surgical management of RCC with renal venous extension continues to develop. The incidence of early surgical complications and operative death have decreased in recent times with the introduction of improved imaging, surgical monitoring and vascular bypass techniques. There is significantly better cancer-specific survival for patients with renal vein involvement only than those with inferior vena cava involvement.
authors.affiliation: Department of Urology, Mayo Clinic, Rochester, Minnesota 55905, USA. blute.michael@mayo.edu
authors.forename: Michael L
authors.initials: ML
authors.lastname: Blute
authors.forename: Bradley C
authors.initials: BC
authors.lastname: Leibovich
authors.forename: Christine M
authors.initials: CM
authors.lastname: Lohse
authors.forename: John C
authors.initials: JC
authors.lastname: Cheville
authors.forename: Horst
authors.initials: H
authors.lastname: Zincke
mesh_terms: D000328:Adult; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000150:complications / Q000473:pathology / Q000601:surgery*; D006801:Humans; D007431:Intraoperative Complications / Q000209:etiology; D007680:Kidney Neoplasms / Q000150:complications / Q000473:pathology / Q000601:surgery*; D008875:Middle Aged; D012044:Regression Analysis; D016019:Survival Analysis; D015912:Thrombolytic Therapy / Q000379:methods*; D016896:Treatment Outcome