TY - JOUR T1 - An Immunoassay Method for the Pharmacokinetics of 5-Fluorouracil in Patients with Gastric Cancer Administered Adjuvant Chemotherapy JF - Anticancer Research JO - Anticancer Res SP - 5111 LP - 5114 VL - 32 IS - 11 AU - HIDEO MATSUMOTO AU - MASAHARU HIGASHIDA AU - HISAKO KUBOTA AU - HARUAKI MURAKAMI AU - KOSUKE TSUTSUMI AU - HIROSHI NAKASHIMA AU - YASUO OKA AU - HIDEO OKUMURA AU - MASAFUMI NAKAMURA AU - TOSHIHIRO HIRAI Y1 - 2012/11/01 UR - http://ar.iiarjournals.org/content/32/11/5111.abstract N2 - Conventional gas chromatography-mass spectrometry (GC-MS) was compared with a new immunoassay method for measuring plasma (5-FU) concentrations in adjuvant chemotherapy with TS-1 for patients with gastric cancer. TS-1 was administered orally to patients after gastrectomy. Blood samples for pharmacokinetic analysis were collected on the seventh day of treatment. The mean area under the time concentration curve (AUC)0-8, half-life (t1/2), and maximum drug concentration (Cmax) obtained by the two methods were as follows: GC-MS, 847.9 μg/ml/hr, 2.76 h, and 186.6 ng/ml; and immunoassay, 1311.2 μg/ml/hr, 3.5 h, and 259.8 ng/ml. Significant correlations were observed for AUC0-8 (p=0.0001), Cmax (p=0.0007), and changes in the 5-FU concentration in blood over time (p=0.018) for the two methods. Compared with the conventional GC-MS method, the new immunoassay method provides similar results, but is simpler and results can be obtained earlier. This method will be useful for monitoring the 5-FU concentration in serum from patients with gastric cancer receiving TS-1. ER -