TGR (tumor regression grade) in rectal cancer

Pathological features, or TGR, of rectal cancer after preoperative radiochemotherapy:

Source: Dworak O, et al, 1997, cited by Park YJ, Oh BR, Lim SW, Huh JW, Joo JK, Kim YJ, Kim HR. Clinical significance of tumor regression grade in rectal cancer with preoperative chemoradiotherapy. J Korean Soc Coloproctol. 2010 Aug;26(4):279-86. Available at: https://doi.org/10.3393/jksc.2010.26.4.279.