MRI tumour regression grade 111 CHAPTER 6 Table 2. Comparison between mrTRG and pTRG Two-tier grading system pTRGa Good responders (1-2) Intermediate/ poor responders (3-5) Total mrTRG1 Good responders (1-2) 18* 1 19 Intermediate/poor responders (3-5) 21 84 105 Total 39 85$ 124 mrTRG2 Good responders (1-2) 25* 20 45 Intermediate/poor responders (3-5) 14 65$ 79 Total 39 85 124 Five-tier grading system pTRGa 1 2 3 4 5 Total mrTRG1 1 4 0 0 0 0 4 2 8 6 1 0 0 15 3 6 7 21 7 1 42 4 3 1 14 15 3 36 5 0 4 15 7 1 27 Total 21 18 51 7 1 124 mrTRG2 1 3 4 1 0 0 8 2 11 7 12 6 1 37 3 7 4 12 8 0 31 4 0 0 10 6 0 16 5 0 3 16 9 4 32 Total 21 18 51 29 5 124 1 Lead radiologist; 2 Second radiologist; a pTRG graded according to Mandard; * true positive; $ true negative. mrTRG = magnetic resonance tumour regression grade, pTRG = pathological regression grade.
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