Quinazoline derivatives Doxazosin, Prazosin, and Erlotinib have a similar effect on tumor growth, the ability to inhibit the growth of the non-small cell lung cancer of a human with the expressed epidermal growth factor receptor (EGFR). And it is this effect that determines the main mechanism of action of mentioned medicines as targeted agents with antitumor effect. And, this effect of doxazosin is almost above of that level of Erlotinib antitumor effect (log IC50, respectively, -5.34 and -4.4). Perhaps this increase of the effect is connected with blockade of alpha-adrenoceptors, which have the ability to stimulate EGFR activity. The data of doxazosin antitumor activity study obtained on nonsmall cell lung cancer (A549) model could ground the expansion of clinical indications of the drug in this form of tumor disease.
