eLife assessment
This study presents a valuable finding on the heterogeneity of tumour metabolism using fluorescence lifetime imaging, measured across 4 cell lines, 4 tumour types of in vivo mouse models, and 21 patient samples. The indication is that the level of heterogeneity of cellular metabolism increases with model complexity and demonstrates high heterogeneity at a clinical level. The evidence supporting the claims of the authors is solid, although the inclusion of a larger number of patient samples would have strengthened the study. The work will be of interest to medical biologists developing methods for quantifying metabolic heterogeneity.