<p>The world’s largest review on opioid medicines for cancer pain has found it is unclear whether some commonly used opioid medicines are better than a placebo and suggests that non-opioid medicines, such as aspirin, may be at least as effective as opioids for background cancer pain.</p>
<p> </p>
<p>The world’s largest review on opioid medicines for cancer pain has found it is unclear whether some commonly used opioid medicines are better than a placebo and suggests that non-opioid medicines, such as aspirin, may be at least as effective as opioids for background cancer pain.</p>
<p> </p>
<p>The world’s largest review on opioid medicines for cancer pain has found it is unclear whether some commonly used opioid medicines are better than a placebo and suggests that non-opioid medicines, including aspirin, may be as effective as opioids.</p>