Dynamic alterations of PFAA profile during perioperative period. Perioperative alterations of PFAA levels in 15 patients with gastric cancer (A) and 10 with breast cancer (B) are presented. *P < 0.05, as compared with those on day 0. Amino acids in cancer patients recovered to normal level after tumor removal (C). *P < 0.05 versus HC. HC: healthy control, Pre: preoperation, Post: postoperation, Ala-BC: Ala of breast cancer patients, Asp-BC: Asp of breast cancer patients, Asp-GC: Asp of gastric cancer patients.