BPTU (BMS-646786) is an allosteric antagonist of P2Y1 (EC50 = 0.06-0.3 μM). Non-nucleotide ligand. Binds receptor outside of the helical bundle. Blocks inhibition of spontaneous contraction of rat and mouse colon induced by electrical field stimulation, nicotine and P2Y agonists. Antithrombotic; reduces platelet aggregation.

Octreotide-treated groups show a significant reduction in the tumor volume when compared with saline group. Octreotide-PPSG (1.4 mg/kg, i.p.) shows greater antitumor effect than Octreotide-soln (100 μg/kg, i.p.). Octreotide-treatments results in significant inhibitory effect on the expression levels of SSTR2 and SSTR5 in primary HCC-bearing rats compared with the saline group. Octreotide-PPSG appears to inhibit the expression of SSTR2 and SSTR5 to a greater extent than that of Octreotide-soln treated group. A test dose of octreotide acetate significantly decreases the serum gastrin level to approximately one third of the baseline in 2 hr and the effect lasted approximately for 6 hr. On day 21, treatment with sustained-release formulation of octreotide acetatea (5 mg intramuscular, q 4 wk) is initiated.