Fig. 2

Raman spectroscopy identifies increased glycogen, which is correlated with radiation-induced tumour regression. Median PC1 score as determined using RS is shown as a function of change in tumour area as measured from time of treatment to time of euthanasia. This is plotted for 0 Gy and 15 Gy irradiated tumours harvested at 3 and 10 days. Error bars represent 95% confidence interval on the median PC1 score, and an estimated measurement uncertainty of 10% on tumour area