A compound having a xanthine oxidase inhibitory activity, such as 1-pyrazole-4-carboxylic acid and the like, can be a drug for preventing cancer including colon cancer and the like, as an agent for suppressing tumorigenesis. A process for correcting the color uniformity of a laser printer may include scanning a test page by an inline scanner of a digital press, determining scanner signal data from the test page, determining a scanner polynomial fitted to the scanner signal data, and determining a non-uniform coverage polynomial from the scanner polynomial. When the transport speed of the post-processing apparatus is different from the printing speed, printed papers are temporarily stopped at the discharge transport portion. This switch is connected to a controlled valve assembly to stop the flow of water in response to the detection of water by the switch. The disarming station also includes a receiving station configured to disarm a security system when the magnetically operated switch or sensor in the RFID tag or IRID tag is activated.