- While cytochrome P450, family 1, subfamily A, polypeptide 2 (CYP1A2) inhibitors/inducers are not specifically excluded, investigators should be aware that the metabolism and consequently overall pharmacokinetics (PKs) of OSI-906 (OSI-906 exposure) could be altered by concomitant use of these drugs (inhibitors, inducers and/or other substrates of CYP1A2); exception: potent CYP1A2 inhibitors ciprofloxacin and fluvoxamine are prohibited; while cytochrome P450, family 2, subfamily C, polypeptide 9 (CYP2C9) substrates are not specifically excluded, investigators should be aware that levels of drugs metabolized by CYP2C9 may be increased by the concomitant administration of OSI-906; caution should be used when administering CYP2C9 substrates to study patients