Volume 187 - Issue 4
Comparing survival outcomes for patients with colorectal cancer treated in public and private hospitals
Author: Niall C Tebbutt
Med J Aust 2007; 187 (4): 250-251. || doi: 10.5694/j.1326-5377.2007.tb01219.x
Published online: 20 August 2007
Published online: 20 August 2007
To the Editor: I note with interest the results of the study by Morris and colleagues comparing survival outcomes for patients with colorectal cancer treated in public and private hospitals.1
Stage of disease is a major determinant of survival in colorectal cancer, yet, as stated in their article, stage of disease was derived solely from pathology reports. I believe that this method would have very limited accuracy in diagnosing stage IV disease. Determining stage IV disease requires additional investigations such as computed tomography, which may either not have been performed before surgery, or the results of which may not have been noted on the pathology request form. Underdiagnosis of stage IV disease appears likely, as the incidence of stage IV disease of about 10% noted in this study is substantially less than the 20%–25% incidence observed in other epidemiological studies.2 Moreover, the limitations associated with the use of pathology reports to determine stage IV disease have been observed by other investigators.3
Although this study evaluates an interesting question in relation to the management of colorectal cancer, the significant possibility of an imbalance of important prognostic factors (such as tumour stage) between public and private patients creates major doubt about its conclusions.
References
- Morris M, Iacopetta B, Platell C. Comparing survival outcomes for patients with colorectal cancer treated in public and private hospitals. Med J Aust 2007; 186: 296-300.
- Cheng X, Chen VW, Steele B, et al. Subsite-specific incidence rate and stage of disease in colorectal cancer by race, gender, and age group in the United States, 1992–1997. Cancer 2001; 92: 2547-2554. 0_CBBEEFFF
- Keating J, Pater P, Lolohea S, Wickremesekera K. The epidemiology of colorectal cancer: what can we learn from the New Zealand Cancer Registry? N Z Med J 2003; 116: u437. 0_pgfId-1338713
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