abt-869 and Gastrointestinal-Stromal-Tumors

Stem cell factor receptor (c-KIT) and platelet derived growth factor receptor alpha (PDGFRα) kinases play an important role in gastrointestinal stromal tumors (GISTs). Here, we have discovered an c-KIT/PDGFRα dual inhibitor, compound 31, with single-digit nanomolar potency against c-KIT and PDGFRα. Compared to Imatinib (1), 31 showed better antiproliferative efficacy against various TEL-c-KIT/PDGFRα-BaF3 isogenic cells, including three 1-resistant BaF3 cell lines, as well as against GIST-T1 and GIST-882 cell lines. Furthermore, compound 31 showed a good KinomeScan selectivity (468 kinases) (S score (1) = 0.01 at 1 μM concentration), good metabolic stability in liver microsomes, and no hERG inhibitory activity. It was worth noting that 31 inhibited GIST-T1 tumor growth (TGI = 81.5%) and even the BaF3-TEL-cKIT-T670I tumor progression (TGI = 41.9%, 1-resistant GISTs) at a dosage of 100 mg/kg/day without exhibiting apparent toxicity.

Topics: Animals; Antineoplastic Agents; Cell Line, Tumor; Chemistry Techniques, Synthetic; Drug Resistance, Neoplasm; Drug Screening Assays, Antitumor; Female; Gastrointestinal Stromal Tumors; Humans; Imatinib Mesylate; Male; Mice, Nude; Molecular Targeted Therapy; Protein Kinase Inhibitors; Proto-Oncogene Proteins c-kit; Rats, Sprague-Dawley; Receptor, Platelet-Derived Growth Factor alpha; Structure-Activity Relationship; Xenograft Model Antitumor Assays