Metabolic profiles of A-07 and R-18 tumors. Mean 1H-HR-MAS-MR spectra (A), PLS-DA score plot (B), and loading plot (C) of tissue samples from A-07 and R-18 tumors. The samples from the A-07 tumors were clearly separated from those from the R-18 tumors. The A-07 tumors showed higher levels of lactate and lower levels of PCho, GPC, glycine, and creatine than the R-18 tumors. PLS-DA classification accuracy: 100%.