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A DOTA-gastrin analogue (APH070) which, when labelled with (111)In, has high affinity for the gastrin/CCK-2 receptor (3nM) and low tumour to kidney ratio in animal models, has been formulated and manufactured for a clinical study. Oxidation of the peptide methionine residue greatly reduces receptor affinity, therefore development work focused on producing a stable intermediate drug product (iDP) whilst ensuring that the formulation, container, closure and manufacturing process did not inhibit the extremely sensitive radiolabelling reaction (itself a source of oxidation). Stress testing revealed that APH070 was stable at 2-8 degrees C at pH 6-9. Addition of an antioxidant (monothioglycerol) to the peptide formulation reduced stability when compared to buffer alone. Use of FluroTec (4023/50) stoppers (rather than FluroTec Plus (4110/40)) increased both the stability and radiolabelling efficiency of APH070. Long term stability (6 months) of the final formulation (1mg/ml APH070 in 0.01 M pH 7.2 phosphate buffer) stored at 5 degrees C in type I glass vials with FluroTec (4023/50) stoppers was 98.6+/-0.2% and 98.4+/-0.1% for upright and inverted samples, respectively. Clinical scale radiolabelling of the final formulation routinely achieves the specification of >85% (111)In-APH070 (unoxidised) stable for up to 2h after dilution with 0.9% w/v saline solution. Specific uptake of the radiopharmaceutical in CCK-2R-expressing AR42J tumours in nude mice has been demonstrated.

Original publication

DOI

10.1016/j.ejps.2007.02.007

Type

Journal article

Journal

Eur J Pharm Sci

Publication Date

06/2007

Volume

31

Pages

102 - 111

Keywords

Animals, Cell Line, Tumor, Chemistry, Pharmaceutical, Chromatography, High Pressure Liquid, Drug Packaging, Drug Stability, Drug Storage, Gastrins, Hydrogen-Ion Concentration, Indium Radioisotopes, Isotope Labeling, Male, Methionine, Mice, Mice, Nude, Neoplasms, Experimental, Oligopeptides, Oxidation-Reduction, Radiopharmaceuticals, Receptor, Cholecystokinin B, Reproducibility of Results, Solubility, Solutions, Technology, Pharmaceutical, Temperature, Time Factors