Tumor regression grading after preoperative chemoradiotherapy for rectal cancer from the German Rectal Cancer Study Group

Tumor regression grade	Definition	Number of patients*	Five-year disease-free survival (%)
0	No regression	28	78
1	<25% of tumor mass	47	55
2	≥25 to 50% of tumor mass	43	83
3	>50% of tumor mass	186	73
4	Complete regression	40	86

* Not all numbers in the respective variables add up to 344 patients because data with unknown factors were excluded from analysis.

Data from: Rödel C, Martus P, Papadoupolos T, et al. Prognostic significance of tumor regression after preoperative chemoradiotherapy for rectal cancer. J Clin Oncol 2005; 23:8688.

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