A well known so called beta blocker that reduces the action of stress inducing hormones and has a variety of potential anti-cancer actions, including those that may suppress metastatic progression especially after surgery.
At least for colorectal and breast cancer, the combination of propranolol, with anti-inflammatory drug etodolac has shown significantly reduced cancer specific and all cause mortality subsequent to surgery (see also etodolac). And recently combined with statins and lung cancer radiotherapy. Notably, there is evidence that propranolol is effective at multiple points in the metastatic cascade, particularly in the context of the post-surgical wound response, and this being the driver of such improved survival rates.
Another pilot study in colorectal cancer from 2023 showed radically improved disease free progression patients, post-surgery . The same team showed earlier that this drug combination resulted in significantly lowered biomarkers of metastatic activity in colorectal cancer surgery, and increased natural killer immune cell responses. Additional data was also produced in post surgery studies for early phase breast cancer in a phase II trial (Highlights 2,3), results independently confirmed in other studies (see References)
An earlier clinical study by a different research group in breast cancer found very strong suppression of cancer progression in propranolol users vs none users (Highlight 4). And a small pilot in melanoma showed postive tendencies but was underpowered to reach high levels of certainty. There are preliminary positive reports with immunotherapy for melanoma which need more evidence. Other positive findings for beta blocker cousin landiolol have been published for reducing progression of lung cancers.
Ongoing studies include the PROSPER pancreatic cancer clinical trial, where etodolac-proproanol is seen as a viable candiate protocol. The PRESERVE trial onging in ovarian cancer therapy is looking at etodolac for stress reduction. Meta-analysis of case controlled and population studies show several cancers have reduced incidence in user of propranolol, though others show no associations for instance in breast cancer case controlled studies.