Real-world Study of the Effectiveness and Tolerability of Outpatient Titration of OxyContin for the Moderate and Severe Pain in Cancer Patients

The purpose of this observational study is to evaluate the effectiveness and tolerability of outpatient titration regimen with OxyContin as background for moderate and severe pain in cancer patients in adult patients with moderate to severe cancer pain. The main questions it aims to answer are * To evaluate the effectiveness of titration regimen with OxyContin as background for the moderate and severe pain in cancer participants * To explore the tolerability of titration regimen with OxyContin as background use in outpatient participants with moderate and severe cancer pain