NXN and neoplasm: The frequency of ‘tumour regression‐like’ changes in S patients (n = 244) was distributed as follows: TRG1: n = 0 (0%), TRG2: n = 3 (1.2%), TRG3: n = 15 (6.2%), TRG4: n = 74 (30.3%) and TRG5: n = 152 (62.3%) (Table 1).