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Identification of the key roles of protein kinases in signaling pathways leading to development of cancer has caused pharmacological interest to concentrate extensively on targeted therapies as a more specific and effective way for blockade of cancer progression. This review will mainly focus on inhibitors targeting these key components of cellular signaling by employing a technology-based point of view with respect to ATP- and non-ATP-competitive small molecule inhibitors and monoclonal antibodies of selected protein kinases, particularly, mammalian target of rapamycin (mTOR), BCR-ABL, MEK, p38 MAPK, EGFR PDGFR, VEGFR, HER2 and Raf. Inhibitors of the heat shock protein Hsp90 are also included in a separate section, as this protein plays an essential role for the maturation/proper activation of cancer-related protein kinases. In the following review, the molecular details of the mode of action of these …