MYCN and neoplasm: While there was no significant difference in native tumour T1 between the Th-MYCN and the Th-ALKF1174L/Th-MYCN mice (1098±71 ms and 1149±118 ms; P>0.1), R2* was significantly faster in tumours in the Th-MYCN mice when compared to the Th-ALKF1174L/Th-MYCN cohort (49.7±4 s−1 and 27.7±3 s−1; P=0.0007).