Agents for Stage 4 Prostate Cancers

Since 2013 when 223Radium-dichloride was FDA approved, there has been some excitement in literature over its benefits in stage 4 prostate cancer. Conclusion of article was ” Ra also has demonstrated to increase overall survival in patients and to delay adverse skeletal events”. Biphophonates like Zoledronic acid and Denosumab can help with the pain of prostate bone cancer.

But the greatest excitement is with use of “225Ac-PSMA-617” – radioactive tagged prostate targetted compound that can induce remission of stage 4 prostate cancer. Sadly, availability may be lacking. Additionally, finding in subjects with oligomets(few metastastes) high dose radiation can induce blood changes similar to a vaccination and bring 1/2 of cases into remission for past year of trial.

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Could Metformin Prevent Opioid Tolerance?

Metformin inhibits mTOR signalling pathway which helps with its anti-cancer properties. Blocking mTOR also seems to reduce tolerance. Tolerance can be seen  in tissue lines by elevated nitrite levels. Metformin prevent nitrite elevation with both methadone and morphine.

I don’t know why actually studies in diabetics on metformin re opioids have not been done but implications from basic science suggests it might be helpful in preventing tolerance,

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