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New Formula Gauges Disease-Free Colorectal Survival


 

Colon cancer was present in 21 patients in the disease-free group and in 19 patients in the metastatic group, with 14 cases of rectal cancer in each group. There were no differences between the two groups with regard to sex, age, tumor location, vascular or lymphatic invasion, or T stage. Perineural invasion was significantly more common in the metastatic group than in the disease-free group (11 cases vs. 2 cases), but Dr. Poritz urged caution in interpreting this because data on perineural invasion were not mentioned in 30 cases.

As expected, significantly more patients in the metastatic group than in the disease-free group had an N stage of 2 (18 cases vs. 6 cases) or N stage of 3 (1 case vs. 0). Similarly, the mean number of positive nodes was higher in the metastatic group than in the disease-free group at 6.1 vs. 2.3 (P = .0049), as was the percentage of positive nodes at 39.6% vs. 13% (P = .0006).

The study excluded patients who had inflammatory bowel disease, associated CRC, recurrent cancer, or perforated cancer, or who had received any neoadjuvant therapy or had died of unknown causes or causes other than cancer.

The authors reported no study support or conflicts of interest.

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