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PD173074 is a poten and selective fibroblast growth factor receptor (FGFR) inhibitor. Fibroblast growth factor-2 is reported to be able to induce proliferation and chemoresistance in Small cell lung cancer (SCLC) cells.

In vitro: PD173074 was found to block H-510 and H-69 SCLC proliferation and clonogenic growth in a dose-dependent fashion and prevent FGF-2-induced chemoresistance as well. These effects correlate with the inhibition of both FGFR1 and FGFR2 transphosphorylation. In addition, PD173074 showed a high degree of selectivity for FGFR tyrosine kinase [2].

In vivo: In the H-510 xenograft mouse model, tumor growth was significanlty improved similar to that seen with single-agent cisplatin administration. Accordingly, PD173074 treatment resulted in significanlty prolonged median survival when compared with that of control sham-treated animals. More dramatically, PD173074 also induced complete responses lasting >6 months in 50% of in mice H-69 xenografts [2].

Clinical trial: PD173074 is still in the preclinical development stage, and no clinical data are available currently.

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