The regulation of narcotics such as opioid therapy for cancer pain has been softened since the late 1990s. There just wasn’t enough evidence to support the idea that opioid treatment always led to severe addictions. And there were many chronic pain patients (including cancer patients) who really needed to benefit of these medications.
Studies showed that opioid use was helpful in controlling pain in the short-term. We still don’t know for sure about the effectiveness of opioids for long-term use. More studies are clearly needed in this area.
For cancer patients with a limited life expectancy, pain control and comfort become central issues. The concern for dependence and addiction take a back seat to quality of life. The goal is to provide helpful pain relief without adding unpleasant side effects.