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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Surgery. 2016 Jul 14;160(5):1326–1332. doi: 10.1016/j.surg.2016.05.017

Table 2.

Ryan Tumor Regression Grade and Patient Pathologic Response.

Pathologic Response Ryan Tumor Regression Grade No. of Patients (%)
No viable cancer cells or single cells/small groups of cancer cells 1 14 (28)
Residual cancer outgrown by fibrosis 2 22 (44)
Significant fibrosis outgrown by cancer or no fibrosis with extensive residual cancer 3 14 (28)

Tumor Regression Grade (TRG) based upon patient pre-operative and post-operative TNM stages using the surgical histopathology. Patients with a score of 1 were considered to have had a complete response (28%), patients with a 2 to have had a partial response (44%), and patients with a score of 3 to have had no response (28%).