a trend toward significancep = 0.06
When evaluated by cancer type, iCTC counts correlate significantly with survival in colon cancer (hazard ratio: 1.06, 95% CI: 1.03–1.09, p < 0.0001) but with a trend toward significance in rectal cancer (hazard ratio: 1.03, 96% CI: 1.00–1.07, p = 0.06).