Author Topic: Metformin--2 studies on growth of VS - 2 different results??  (Read 749 times)

Rocky

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Metformin--2 studies on growth of VS - 2 different results??
« on: August 02, 2020, 01:47:07 am »
https://journals.lww.com/otology-neurotology/Abstract/2020/03000/Metformin_Potential_Impact_on_the_Growth_of.27.aspx
Metformin Potential Impact on the Growth of Vestibular Schwannomas
Abstract

Objective:

Previous work has suggested that metformin may possess antineoplastic properties. This study aims to assess the effect of metformin on the growth of sporadic vestibular schwannomas.

Methods:

A retrospective cohort study was performed on patients presenting with radiologically confirmed vestibular schwannomas to Stanford medical center between January 1990 and October 2018. Patients who received metformin during the follow-up period were included and were compared with the control group who were not receiving metformin. Tumor progression and hearing loss are primary and secondary outcomes, respectively.

Results:

A total of 149 patients were analyzed, with 42 patients receiving metformin. The mean age at presentation is 69.6 (±11.7) years. There are 69 (46.3%) females and 80 (53.7%) males and there is no significant age difference between the groups. Tumor size at presentation is similar between both groups, 8 mm (4–13) in control group and 7.5 mm (4–14) in metformin group. The average follow-up period is 34.2 months (18.3–57.8) and 30.3 months (13.6–69.8) in the metformin and control cohorts, respectively, and they are not significantly different. No significant differences between both groups were found in final American Academy of Otolaryngology - Head and Neck Surgery hearing outcome or poor audiogram outcome. Metformin users are significantly less likely to present with tumor growth at final follow-up compared with nonmetformin users (28.6 versus 49.5%, respectively; p = 0.02).

Conclusions:

This preliminary result suggests metformin may reduce vestibular schwannoma tumor growth rate and shows potential promise as a novel chemotherapeutic agent. Further studies are needed to validate this finding.

Freelander

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Re: Metformin--2 studies on growth of VS - 2 different results??
« Reply #1 on: August 08, 2020, 01:18:24 pm »
Fascinating article.   I am optimistic that at some future time, there will be effective, safe medicinal options for the treatment of VS, and would like to see their application on larger tumors in addition to the smaller ones used for this research.   

mwatto

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Re: Metformin--2 studies on growth of VS - 2 different results??
« Reply #2 on: September 05, 2020, 09:29:14 pm »
Very interesting! I wonder if metformin would be a useful adjunct to radiation? I am taking melatonin and boswellia - someone on the forum posted about bromelain shrinking her AN by 78%! Be wonderful if  we could medicate and keep growth down.
Michele
20 x19x14mm AN diagnosed Feb 2019. Cyberknife .
Mri Oct 2019 showed shrinking to: 18x17x13 mm.
Mri Oct 2020 - no cystic components visible now. Slight shrinking, stable.

notaclone13

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Re: Metformin--2 studies on growth of VS - 2 different results??
« Reply #3 on: September 06, 2020, 11:12:35 am »
I didn’t see that post on boswellia, but it is an anti- inflammatory. Do you remember what they said?

mwatto

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Re: Metformin--2 studies on growth of VS - 2 different results??
« Reply #4 on: September 07, 2020, 12:45:45 am »
This was the post: I do not now the member TW. "I believe the most effective natural supplement for shrinking a tumor -- after radiation treatments have started to kill it -- is bromelain. Even traditional Western researchers have found that bromelain shrinks some tumors, and a major cancer center (I can't remember which one now, but it was a medical center of the same notoriety as Johns Hopkins) posted on their website many years ago a reference to research on the tumor-shrinking abilities of bromelain. If I remember correctly (it's been years since I researched it), bromelain digests fibrin, of which tumors are partly composed. I took high doses of bromelain both before (for five months) and after (for a couple years) CK. Before treatments, it failed to halt the rapid growth of my AN. But after CK, my tumor rapidly shrank around 70% in volume (after initially swelling due to the radiation). If you want to try this yourself, just be aware that high doses can cause stomach upset and cramping. I found the side effects to be a tolerable trade-off.
Quercitin, resveratrol, curcumin and other natural anti-angiogenesis supplements didn't seem to have any noticeable benefit to me.
My opinions are all based on empirical observations and subjective experience, so take them with a truckload of salt. My tumor shrinkage could have been coincidental or due to some other factor."
My two cents,
TW
Michele
20 x19x14mm AN diagnosed Feb 2019. Cyberknife .
Mri Oct 2019 showed shrinking to: 18x17x13 mm.
Mri Oct 2020 - no cystic components visible now. Slight shrinking, stable.

Rocky

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Another study about metformin and AN growth....published in July.
« Reply #5 on: September 07, 2020, 09:06:30 am »
I have started taking Metformin---my family physician is a big fan of this drug. He feels that it is a medication with alot of benefits. ...even against Covid- "Metformin is a widely available anti-diabetic agent that has an excellent safety profile, and clinical and preclinical data suggest metformin may offer cardiopulmonary protection in COVID-19 via enhanced ACE2 expression."   (30 articles about this on pubmed). With the regular Metformin-I suffered from abdominal pain and diarrhoea. I read further, and now take an extended release form. NO more GI - issues.

I have not spoken to my neurosurgeon about this.....


Association of Metformin With the Growth of Vestibular Schwannomas.
Tran S, Killeen DE, Qazi S, Balachandra S, Hunter JB.
Otolaryngol Head Neck Surg. 2020 Jul 7:194599820937970. doi: 10.1177/0194599820937970. Online ahead of print.
PMID: 32633197
Abstract

Objective: To assess whether medication use, specifically statin, metformin, and aspirin, affects the growth of vestibular schwannomas (VSs).

Study design: Retrospective case series.

Setting: Single tertiary care academic hospital.

Subjects and methods: Patients were enrolled if they were diagnosed with sporadic VS and had at least 2 magnetic resonance imaging (MRI) studies at a minimum of 6 months apart prior to any intervention. Electronic medical records were reviewed for demographic and medication data. Tumor volumes on MRI studies were assessed via BrainLab iPlan. The primary endpoint was VS tumor growth, defined as a 20% increase in tumor volume, between consecutive MRI studies or between the first and last available MRI study. Predictors of volumetric growth, specifically statin, aspirin, or metformin use, were analyzed with t tests, chi-square test, univariate logistic regression, and multivariate logistic regression.

Results: A total of 387 patients met inclusion criteria, 53.5% of whom were women. For all patients, the mean age was 60.6 years (range, 18.2-89.2 years); the mean axial tumor diameter, 11.9 mm (range, 1.7-32.0 mm); and the mean tumor volume, 0.85 cm3 (range, 0.01-13.1 cm3). In review of the electronic medical record, 46 patients (11.9%) were taking metformin; 145 (37.5%), a statin; and 117 (30.2%), aspirin. Among patients taking metformin, 39.1% (18/46) exhibited volumetric growth, as opposed to 58.2% (198/340) of nonusers (P = .014). Metformin (odds ratio, 0.497; P = .036) is significantly associated with reduced VS growth when controlling for aspirin, statin, and tumor size on multivariate logistic regression.

Conclusion: Metformin use is associated with reduced volumetric VS growth.

 
Metformin Potential Impact on the Growth of Vestibular Schwannomas.
Feng AY, Enriquez-Marulanda A, Kouhi A, Ali NE, Moore JM, Vaisbuch Y.
Otol Neurotol. 2020 Mar;41(3):403-410. doi: 10.1097/MAO.0000000000002545.
PMID: 31913209
Abstract

Objective: Previous work has suggested that metformin may possess antineoplastic properties. This study aims to assess the effect of metformin on the growth of sporadic vestibular schwannomas.

Methods: A retrospective cohort study was performed on patients presenting with radiologically confirmed vestibular schwannomas to Stanford medical center between January 1990 and October 2018. Patients who received metformin during the follow-up period were included and were compared with the control group who were not receiving metformin. Tumor progression and hearing loss are primary and secondary outcomes, respectively.

Results: A total of 149 patients were analyzed, with 42 patients receiving metformin. The mean age at presentation is 69.6 (±11.7) years. There are 69 (46.3%) females and 80 (53.7%) males and there is no significant age difference between the groups. Tumor size at presentation is similar between both groups, 8 mm (4-13) in control group and 7.5 mm (4-14) in metformin group. The average follow-up period is 34.2 months (18.3-57.8) and 30.3 months (13.6-69.8) in the metformin and control cohorts, respectively, and they are not significantly different. No significant differences between both groups were found in final American Academy of Otolaryngology - Head and Neck Surgery hearing outcome or poor audiogram outcome. Metformin users are significantly less likely to present with tumor growth at final follow-up compared with nonmetformin users (28.6 versus 49.5%, respectively; p = 0.02).

Conclusions: This preliminary result suggests metformin may reduce vestibular schwannoma tumor growth rate and shows potential promise as a novel chemotherapeutic agent. Further studies are needed to validate this finding.

mwatto

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Re: Metformin--2 studies on growth of VS - 2 different results??
« Reply #6 on: September 07, 2020, 09:21:28 pm »
Thank you for sharing this Rocky!
Michele
20 x19x14mm AN diagnosed Feb 2019. Cyberknife .
Mri Oct 2019 showed shrinking to: 18x17x13 mm.
Mri Oct 2020 - no cystic components visible now. Slight shrinking, stable.

mwatto

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Re: Metformin--2 studies on growth of VS - 2 different results??
« Reply #7 on: October 02, 2020, 10:32:11 pm »
Myo Inositol is completely natural and works exactly the same way as Metformin. Its freely available in most health shops. Mine says a quarter teaspoon with food...a number of health benefits notably insulin regulation.
Michele
20 x19x14mm AN diagnosed Feb 2019. Cyberknife .
Mri Oct 2019 showed shrinking to: 18x17x13 mm.
Mri Oct 2020 - no cystic components visible now. Slight shrinking, stable.