Progression Rate of MSA Under EGCG Supplementation as Anti-Aggregation-Approach

Multiple System Atrophy Clinical Trial

— PROMESA  

Official title:

Double-blind, Randomised, Placebo-controlled Parallel Group Study to Investigate the Effect of EGCG Supplementation on Disease Progression of Patients With Multiple System Atrophy (MSA)

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02008721
• Other study ID #: PROMESA
• Status: Completed
• Phase: Phase 3
• Start date: January 2014
• Est. completion date: December 2016

Study information

• Verified date: August 2023
• Source: Ludwig-Maximilians - University of Munich
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

MSA is a rapidly progressive disorder with an average survival time of about 7 years after the first clinical manifestation. No potent symptomatic treatment is currently available. A disease-modifying therapy does not exist either. The growing understanding in recent years of the underlying pathological mechanisms of the disease allows the development of new treatment options that have a modifying effect on the disease progression. Therefore, treatments are urgently required that effect the central underlying pathological mechanism, which appears to be the intracellular aggregation of toxic oligomers of α-synuclein.

EGCG, a polyphenol found in green tea, has shown to inhibit the formation of toxic α-synuclein oligomers in vitro and has shown to transform α-synuclein-oligomers in non-toxic oligomer species. There is also evidence for a neuroprotective effect in MPTP-mouse models of PD and is an antioxidant and iron chelator. There are currently 63 clinical studies (http://clinicaltrial.gov) in which EGCG was applied for various indications, such as Multiple Sclerosis, various forms of cancer and Huntington's disease. All of which have shown good tolerability and safety with the applied doses of EGCG of up to 1200 mg per day, demonstrating the safety of the drug under controlled clinical conditions (see 5.3.1 for hepatotoxicity in uncontrolled conditions).

These data provide a solid rationale for testing in a clinical trial if supplementation of EGCG can interfere with the core disease mechanism in MSA and consequently retard the clinical progression of the MSA-related disability.

Description:

5 Introduction Multiple System Atrophy (MSA) is a slowly progressing neurodegenerative disease that is characterized by i) a hypokinetic movement disorder which defines MSA of the parkinsonian type (MSA-P) or by ii) cerebellar symptoms which define MSA of the cerebellar type (MSA-C). In both types the movement disorder can be accompanied by vegetative symptoms such as orthostatic hypotension. In contrast to Parkinson's disease (PD), the effect of dopaminergic medication on the parkinsonian symptoms is very limited. In spite of several efforts, no disease modifying therapy has been identified so far. Several lines of evidence including epidemiological, in vitro, and in vivo data, suggest that Epigallocatechin gallate (EGCG) might be able to delay disease progression of MSA by modifying several aspects in the pathogenesis of MSA such as protein aggregation, oxidative stress and iron accumulation. Therefore, this study is designed to investigate the influence of EGCG on disease progression in patients with MSA. To assess the effect on disease progression, clinical evaluation and MR-imaging will be applied in a bi-center, prospective, placebo-controlled, double-blind randomized phase III trial. The primary outcome measure will be the change in motor symptoms from V1 to V7 measured by the UMSARS-ME comparing placebo- vs. verum-treated patients. The secondary efficacy endpoint will be the change from V1 to V7 in the total UMSARS score, in the CGI score and in MRI parameters (global and regional atrophy / iron deposition) comparing placebo- vs. verum-treated patients.

5.1 Background The disease: MSA is a synucleinopathy that is suitable for various reasons as a model disease to investigate disease-modifying effects in α-synuclein (aSyn)-dependent neurodegeneration. The disease progression is more rapid compared to PD and therefore allows the observation of clinically relevant effects in shorter observation periods. As no potent symptomatic treatment of MSA is currently available, the influence of symptomatic active substances on clinical data is limited and placebo can be used as comparator. This solves the potential ethical problem of having to deprive patients of such symptomatic treatment during the study and underlines the high medical need for a symptomatic treatment. Another important argument for neuroprotection studies in MSA is that in three independent studies EMSA, NNIPPS, MEMSA a very similar disease progression was observed over a defined period of time, which enables a precise power analysis with sample sizes and follow-up periods that are suitable for an investigator initiated trial (IIT).

The therapeutic target: An increasing amount of data suggests that toxic oligomers from misfolded, disease-specific proteins play a potentially important role in the neuronal cell death in neurodegenerative diseases. Specifically in MSA, oligomeric aSyn aggregate species appear to be crucially involved in the pathogenetic mechanisms.

The pharmacological compound: Epidemiological data suggest that ingredients in tea may be neuroprotective for synucleinopathies in man. Regular consumption of tea reduces the risk of contracting PD by about 50%. Also for MSA, a clear trend in the sense of a positive effect of tea consumption on the risk of disease development was observed (OR = 0.5, 95% CI: 0.22-1.5, p = 0.09). EGCG, a polyphenol that is for example found in green tea, inhibits the formation of toxic aSyn oligomers in vitro and transforms aSyn oligomers by direct interaction in alternative, non-toxic oligomer species. Furthermore, EGCG shows a neuroprotective effect in the 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridin (MPTP) mouse model of PD. In addition, EGCG is an antioxidant and an iron chelator and therefore has more potential beneficial effects on synucleinopathies.

The pharmacokinetic properties of EGCG were tested in humans in the serum and in rodents in serum and organs, including the brain in detail. It was found that repeated oral application of doses of EGCG result in a significant increase in serum levels in healthy adults compared to a single dose. The proposed daily dose of 1200 mg of EGCG is comparable to about 15 to 30 cups of green tea (depending on the mode of preparation) (Prof. F. Paul, Berlin, pers. comm.). Animal experiments in rodents have shown that after a single i.v. dose of EGCG, the substance is found in the brain in significant quantities.

5.2 Trial Rationale MSA is a rapidly progressive disorder with an average survival time of about 7 years after the first clinical manifestation. No potent symptomatic treatment is currently available. A disease-modifying therapy does not exist either. The growing understanding in recent years of the underlying pathological mechanisms of the disease allows the development of new treatment options that have a modifying effect on the disease progression. Therefore, treatments are urgently required that effect the central underlying pathological mechanism, which appears to be the intracellular aggregation of toxic oligomers of aSyn.

EGCG, a polyphenol found in green tea, has shown to inhibit the formation of toxic aSyn oligomers in vitro and has shown to transform aSyn-oligomers in non-toxic oligomer species. There is also evidence for a neuroprotective effect in MPTP-mouse models of PD and is an antioxidant and iron chelator. There are currently 63 clinical studies in which EGCG was applied for various indications, such as Multiple Sclerosis, various forms of cancer and Huntington's disease. All of which have shown good tolerability and safety with the applied doses of EGCG of up to 1200 mg per day, demonstrating the safety of the drug under controlled clinical conditions.

These data provide a solid rationale for testing in a clinical trial if supplementation of EGCG can interfere with the core disease mechanism in MSA and consequently retard the clinical progression of the MSA-related disability.

5.3 Side effects and Risk Benefit Assessment 5.3.1 Side effects In all clinical trials investigating the oral intake of green tea/EGCG in various doses and pharmacological forms, EGCG has shown a good safety and tolerability in daily doses of up to 1200 mg over a period of 6 months. Side effects that have been reported after application of EGCG were usually mild and did not occur more often than under placebo (flatulence, headache, nausea, vertigo, abdominal cramps and muscle pain). Other reported side effects (arterial hypertension, palpitations, headache, polyuria, tremor, sleep disorders, nausea/vomiting) are due to the caffeine part in green tea and are not due to EGCG, as all studies using pure EGCG have not reported such side effects.

No relevant or persistent changes in the extensive clinical serum tests have been found so far; also no influence on vital parameters have been reported after using EGCG. Only minimal and transient changes of the blood pressure, echocardiography, liver function tests and serum lipids have been reported. In a study of Chow et al. healthy subjects were given 800 mg EGCG or Polyphenon E (a mixture of several green tea extracts with a 50-75%share of EGCG) once daily or 400 mg twice daily versus placebo over a period of 4 weeks. Only mild side effects occurred in several subjects (flatulence, abdominal pain, nausea, headache, dizziness and muscle pain) that were not occurring more often than under placebo.

The SuniMS study, NCT ID: 00525668, recorded no SUSAR in 120 patients with remitting-relapsing MS, who were administered 800 mg Sunphenon/ EGCG per day. They also were able to show an excellent tolerability. Only 15 patients showed mild, clinically insignificant elevations of liver function tests, which are not necessarily caused by the study medication. The ongoing SUPREMES study, NCT ID: 00799, has so far not recorded any SUSAR in 60 patients with progressive MS who have been on up to 1200 mg EGCG/day for up to 48 months.

In a study by Chen et al a significant protective effect of orally applied EGCG could be demonstrated in mice with a toxic liver failure caused by tetrachlorohydrocarbons. Otherwise, single cases of hepatotoxicity following application of various forms of green tea polyphenols are known. In the period between 1999 and 2008, 34 such case reports have been published, 29 of which have shown a positive de-challenge and 7 have shown a positive re-challenge. The clinical and pathological symptoms included mild elevations of liver function tests, cholestasis, cholangitis, hepatocellular inflammation and hepatocellular necrosis. The symptoms were usually completely reversible after stopping the medication. One patient died of liver failure. Signs of liver toxicity were recorded between day 9 up to 5 months after beginning a therapy with doses of 187,5 -468,75mg EGCG/day).

The withdrawal of a green tea extract in Spain and France (Exolise®) a couple of years ago needs to be mentioned. After application of this medication some cases of severe hepatotoxicity were reported. Symptoms like icterus, massive elevation of transaminases occurred not later than 12 weeks after beginning the treatment with the extract in capsules and were completely reversible few weeks after stopping the medication. The exact underlying mechanisms have not been completely worked out. Possibly these are due to a SAE that is specific for Exolise®, and is connected with the manufacturing process (hydro-alcoholic extraction techniques). For this reason, only the distribution of Exolise® has been stopped by the respective authorities, but not the distribution of other green tea extracts (see also the following publications by the WHO): www.who.int/entity/medicines/publications/restrictedpharm2005.pdf It has not yet been found out which parts of the polyphenols and their metabolites are responsible for the hepatotoxic effects. Even though in most cases mixtures of green tea and polyphenols have been administered it is suspected, that EGCG as a main component of the green tea extracts shows hepatotoxic potential. In favor of this hypothesis is the fact, that there have been reports of elevated transaminases under treatment with EGCG in man and interactions with other substances. EGCG is known to bind to α- and β-estrogene receptors and increases 17 β-estradiol-induced reactions in mice. EGCG is a known inhibitor of the Catechol-O-methyltransferase (COMT) that catalyses the degradation of exogenous and endogenous substances.

It is suspected, that for the biotransformation of green tea catechines, COMT plays an important role. COMT polymorphisms with low activity of COMT could result in elevated plasma levels of toxic EGCG metabolites.

The cytotoxicity of EGCG in hepatocytes seems to be low in vitro and only doses that are higher by a multiple compared to the doses used in clinical studies lead to liver necrosis in animal models. Also, the extremely low bioavailability in man has to be considered.

On the basis of all recent studies using green tea extract and EGCG there are no reports of persistent and severe influence on the physiological systems (blood circulation, respiratory system, central nervous system and urinary tract). Still there are singular case reports of hepatotoxic effects in the context of intake of green tea extracts/ EGCG.

As a conclusion, all data are in favor of a good tolerability of the substance. For further details see the investigator's brochure (Polyphenon E).

5.3.2 Risk Benefit Assessment The reported data suggest a safe pharmacological profile apart from individual cases of hepatotoxicity which can be controlled for by routine serum liver parameters. The preclinical data suggest a molecular mode of action for EGCG which appears to target core pathological mechanisms active in MSA. In absence of any effective symptomatic, protective or curative intervention in this devastating disorder, the risk benefit evaluation justifies the conduct of the proposed clinical trial.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 92
• Est. completion date: December 2016
• Est. primary completion date: September 2016
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. "clinical possible" or "clinical probable" MSA (Gilman et al., Neurology, 2008 26;71:670-6)

2. Hoehn & Yahr stage I - III

3. A stable regimen for at least 1 month prior to V1 and willingness / no fore-seeable need to change the regimen throughout the 52 week follow-up pe-riod for

1. drugs acting against Parkinsonism (e.g. Levodopa, Dopamine-Agonists, Amantadine and MAO-B-Inhibitors)

2. drugs acting against autonomic dysfunction (e.g. ephedrin, midodrin, fludrucortison, octreotide, desmopresin, oxybutinine)

3. antidepressant and antidementive drugs.

4. No regular consumption of EGCG, green tea, or more than two cups of black tea per day

5. Capability and willingness to give written informed consent indicating that the subject has been informed of and understood all aspects pertinent to the study

6. Capability and willingness to comply with the procedures of the study

7. Contraception by adequate contraceptive methods (oral, injected or im-planted hormonal contraceptive methods, intrauterine pessar, sterilisation or real abstinence) in all female patients with childbearing potential

8. Absence of liver disease documented by transaminases and bilirubin below 2-folds of the upper normal level.

Exclusion Criteria:

1. Hoehn & Yahr stage > III (loss of postural reflexes, no independent walking possible, inability to stand unassisted, wheelchair-bound).

2. Neurodegenerative diseases other than MSA

3. Severe liver disease with elevation of transaminases and bilirubin above 2-folds of the upper normal level or regular intake of hepatotoxic drugs

4. Known hypersensitivity to EGCG or to drugs with similar chemical structure

5. Participation in another clinical trial involving administration of an investigational medicinal product within 1 month prior to V1

6. A physical or psychiatric condition, which at the investigator's discretion may put the subject at risk, may confound the trial results, or may interfere with the subject's participation in this clinical trial

7. Persistent abuse of medication, drugs or alcohol

8. Consumption of > 500 ml grapefruit juice per day (leading to inhibition of cytochrome P-450 isoenzyme 3A4, which may be involved in degradation of EGCG).

9. Current or planned pregnancy or breast feeding in females

10. Females of childbearing potential, who are not using medically reliable methods of contraception for the entire study duration (such as oral, inject-able, or implantable contraceptives, or intrauterine contraceptive devices).

11. Intake of COMT-inhibitors (e.g. Entacapone, Tolcapone)

12. Current or planned therapy with Bortezomib and/ or history of plasmocytoma.

13. Anemia at Screening (Hb < 10g/dl)

14. Other severe medical conditions upon discretion of the LKP

Related Conditions & MeSH terms

• Atrophy
• Multiple System Atrophy
• Shy-Drager Syndrome

Intervention

Drug:
• EGCG as putative neuroprotective agent
Treatment with 800 mg - 1200 mg EGCG as putative neuroprotective agent
• Placebo
Placebo

Locations

Country	Name	City	State
Germany	Kliniken Beelitz GmbH, Neurologisches Fachkrankenhaus für Bewegungsstörungen	Beelitz-Heilstätten
Germany	Charité - Universitätsmedizin Berlin	Berlin
Germany	Technische Universität Dresden	Dresden
Germany	Heinrich-Heine-Universität, Neurologische Klinik	Düsseldorf
Germany	Paracelsus-Elena-Klinik Kassel	Kassel
Germany	Universität Leipzig	Leipzig
Germany	Universitätsklinikum Schleswig-Holstein, Campus Lübeck	Lübeck
Germany	Philipps Universität Marburg	Marburg
Germany	Department of Neurology, Klinikum rechts der Isar, Technische Universität München	München	Bavaria
Germany	Neurology Department, Ludwig-Maximilians University	München	Bavaria
Germany	Eberhard Karls Universität Tübingen	Tübingen
Germany	Universitätsklinikum Ulm	Ulm

Sponsors (5)

Lead Sponsor	Collaborator
Dr. Johannes Levin	Deutsche Parkinson Vereinigung, German Center for Neurodegenerative Diseases (DZNE), German Foundation for Neurology, ParkinsonFonds Deutschland gGmbH

Country where clinical trial is conducted

Germany, 

References & Publications (18)

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Bieschke J, Russ J, Friedrich RP, Ehrnhoefer DE, Wobst H, Neugebauer K, Wanker EE. EGCG remodels mature alpha-synuclein and amyloid-beta fibrils and reduces cellular toxicity. Proc Natl Acad Sci U S A. 2010 Apr 27;107(17):7710-5. doi: 10.1073/pnas.0910723107. Epub 2010 Apr 12. — View Citation

Caruana M, Hogen T, Levin J, Hillmer A, Giese A, Vassallo N. Inhibition and disaggregation of alpha-synuclein oligomers by natural polyphenolic compounds. FEBS Lett. 2011 Apr 20;585(8):1113-20. doi: 10.1016/j.febslet.2011.03.046. Epub 2011 Mar 31. — View Citation

Checkoway H, Powers K, Smith-Weller T, Franklin GM, Longstreth WT Jr, Swanson PD. Parkinson's disease risks associated with cigarette smoking, alcohol consumption, and caffeine intake. Am J Epidemiol. 2002 Apr 15;155(8):732-8. doi: 10.1093/aje/155.8.732. — View Citation

Chow HH, Cai Y, Hakim IA, Crowell JA, Shahi F, Brooks CA, Dorr RT, Hara Y, Alberts DS. Pharmacokinetics and safety of green tea polyphenols after multiple-dose administration of epigallocatechin gallate and polyphenon E in healthy individuals. Clin Cancer Res. 2003 Aug 15;9(9):3312-9. — View Citation

Dodel R, Spottke A, Gerhard A, Reuss A, Reinecker S, Schimke N, Trenkwalder C, Sixel-Doring F, Herting B, Kamm C, Gasser T, Sawires M, Geser F, Kollensperger M, Seppi K, Kloss M, Krause M, Daniels C, Deuschl G, Bottger S, Naumann M, Lipp A, Gruber D, Kupsch A, Du Y, Turkheimer F, Brooks DJ, Klockgether T, Poewe W, Wenning G, Schade-Brittinger C, Oertel WH, Eggert K. Minocycline 1-year therapy in multiple-system-atrophy: effect on clinical symptoms and [(11)C] (R)-PK11195 PET (MEMSA-trial). Mov Disord. 2010 Jan 15;25(1):97-107. doi: 10.1002/mds.22732. — View Citation

Gilman S, Wenning GK, Low PA, Brooks DJ, Mathias CJ, Trojanowski JQ, Wood NW, Colosimo C, Durr A, Fowler CJ, Kaufmann H, Klockgether T, Lees A, Poewe W, Quinn N, Revesz T, Robertson D, Sandroni P, Seppi K, Vidailhet M. Second consensus statement on the diagnosis of multiple system atrophy. Neurology. 2008 Aug 26;71(9):670-6. doi: 10.1212/01.wnl.0000324625.00404.15. — View Citation

Huppertz HJ, Kroll-Seger J, Kloppel S, Ganz RE, Kassubek J. Intra- and interscanner variability of automated voxel-based volumetry based on a 3D probabilistic atlas of human cerebral structures. Neuroimage. 2010 Feb 1;49(3):2216-24. doi: 10.1016/j.neuroimage.2009.10.066. Epub 2009 Oct 28. — View Citation

Kragh CL, Lund LB, Febbraro F, Hansen HD, Gai WP, El-Agnaf O, Richter-Landsberg C, Jensen PH. Alpha-synuclein aggregation and Ser-129 phosphorylation-dependent cell death in oligodendroglial cells. J Biol Chem. 2009 Apr 10;284(15):10211-22. doi: 10.1074/jbc.M809671200. Epub 2009 Feb 9. — View Citation

Levites Y, Weinreb O, Maor G, Youdim MB, Mandel S. Green tea polyphenol (-)-epigallocatechin-3-gallate prevents N-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced dopaminergic neurodegeneration. J Neurochem. 2001 Sep;78(5):1073-82. doi: 10.1046/j.1471-4159.2001.00490.x. — View Citation

Lin LC, Wang MN, Tseng TY, Sung JS, Tsai TH. Pharmacokinetics of (-)-epigallocatechin-3-gallate in conscious and freely moving rats and its brain regional distribution. J Agric Food Chem. 2007 Feb 21;55(4):1517-24. doi: 10.1021/jf062816a. Epub 2007 Jan 27. — View Citation

Schweser F, Deistung A, Lehr BW, Reichenbach JR. Differentiation between diamagnetic and paramagnetic cerebral lesions based on magnetic susceptibility mapping. Med Phys. 2010 Oct;37(10):5165-78. doi: 10.1118/1.3481505. — View Citation

Schweser F, Sommer K, Deistung A, Reichenbach JR. Quantitative susceptibility mapping for investigating subtle susceptibility variations in the human brain. Neuroimage. 2012 Sep;62(3):2083-100. doi: 10.1016/j.neuroimage.2012.05.067. Epub 2012 Jun 1. — View Citation

Tan EK, Tan C, Fook-Chong SM, Lum SY, Chai A, Chung H, Shen H, Zhao Y, Teoh ML, Yih Y, Pavanni R, Chandran VR, Wong MC. Dose-dependent protective effect of coffee, tea, and smoking in Parkinson's disease: a study in ethnic Chinese. J Neurol Sci. 2003 Dec 15;216(1):163-7. doi: 10.1016/j.jns.2003.07.006. — View Citation

Ullmann U, Haller J, Decourt JD, Girault J, Spitzer V, Weber P. Plasma-kinetic characteristics of purified and isolated green tea catechin epigallocatechin gallate (EGCG) after 10 days repeated dosing in healthy volunteers. Int J Vitam Nutr Res. 2004 Jul;74(4):269-78. doi: 10.1024/0300-9831.74.4.269. — View Citation

Vidal JS, Vidailhet M, Elbaz A, Derkinderen P, Tzourio C, Alperovitch A. Risk factors of multiple system atrophy: a case-control study in French patients. Mov Disord. 2008 Apr 30;23(6):797-803. doi: 10.1002/mds.21857. — View Citation

Wang Y, Butros SR, Shuai X, Dai Y, Chen C, Liu M, Haacke EM, Hu J, Xu H. Different iron-deposition patterns of multiple system atrophy with predominant parkinsonism and idiopathetic Parkinson diseases demonstrated by phase-corrected susceptibility-weighted imaging. AJNR Am J Neuroradiol. 2012 Feb;33(2):266-73. doi: 10.3174/ajnr.A2765. Epub 2011 Nov 3. — View Citation

Wenning GK, Tison F, Seppi K, Sampaio C, Diem A, Yekhlef F, Ghorayeb I, Ory F, Galitzky M, Scaravilli T, Bozi M, Colosimo C, Gilman S, Shults CW, Quinn NP, Rascol O, Poewe W; Multiple System Atrophy Study Group. Development and validation of the Unified Multiple System Atrophy Rating Scale (UMSARS). Mov Disord. 2004 Dec;19(12):1391-402. doi: 10.1002/mds.20255. — View Citation

* Note: There are 18 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change of Score in Motor Examination (ME) of the Unified MSA Rating Scale (UMSARS-ME) From V1 to V7.	To assess the efficacy of EGCG vs. Placebo to reduce the progression in the motor examination (ME) of the Unified MSA Rating Scale (UMSARS-ME) from V1 to V7.; The UMSARS-ME (Unified Multiple System Atrophy Rating Scale, Motor examination) assesses 14 operationalised signs of multiple system atrophy. 25 Scores for all 14 items range from 0 to 4, thus total scores range from 0 to 56. Higher scores mean a worse outcome.	52 weeks
Secondary	Possible Symptomatic Effects of EGCG vs. Placebo Measured by the Change in the UMSARS - ME in the Wash-out Phase (From V6-V7)	To assess any effect of EGCG vs. Placebo on the evolution of the above mentioned parameters during the wash-out phase (from V6-V7) measured by the UMSARS - ME.; The UMSARS-ME (Unified Multiple System Atrophy Rating Scale, Motor examination) assesses 14 operationalised signs of multiple system atrophy. 25 Scores for all 14 items range from 0 to 4, thus total scores range from 0 to 56. Higher scores mean a worse outcome.	4 weeks
Secondary	Change in the UMSARS Total Score From V1 to V7	To assess the efficacy of EGCG vs. Placebo to reduce the progression from V1 to V7 in UMSARS total score; The total score of the UMSARS (Unified Multiple System Atrophy Rating Scale) is a disease specific rating scale that comprises the activities of daily living subscale and the motor examination subscale.; The activities of daily living subscale assesses motor symptoms and autonomic symptoms (items 1-12 of the UMSARS activities of daily living subscale) with scores from 0-4 for every item, resulting in a minimum score of 0 and a maximum score of 48. A higher score means a worse outcome. It also includes the 14 items of the UMSARS motor examination subscale with possible scores from 0-4 for every item, resulting in a score range from 0-56. The UMSARS total score hence shows a range from 0 to 104.; Higher scores indicate a greater impairment.	52 weeks
Secondary	Possible Symptomatic Effects of EGCG vs. Placebo Measured by the UMSARS Total Score From V6 to V7 (During the Washout Phase)	To assess any effect of EGCG vs. Placebo on the UMSARS total score during the wash-out phase (from V6 to V7) to explore possible symptomatic effects.; The total score of the UMSARS (Unified Multiple System Atrophy Rating Scale) is a disease specific rating scale that comprises the activities of daily living subscale and the motor examination subscale.; The activities of daily living subscale assesses motor symptoms and autonomic symptoms (items 1-12 of the UMSARS activities of daily living subscale) with scores from 0-4 for every item, resulting in a minimum score of 0 and a maximum score of 48. A higher score means a worse outcome. It also includes the 14 items of the UMSARS motor examination subscale with possible scores from 0-4 for every item, resulting in a score range from 0-56. The UMSARS total score hence shows a range from 0 to 104, a higher score indicates greater impairment.	4 weeks
Secondary	Percentage of Striatal Volume Loss in MRI (3D MP-RAGE MRI Volumetry, 3D FLAIR) From Baseline to V7 as Effect of Treatment (Epigallocatechin Gallate vs Placebo)	To assess the efficacy of EGCG vs. Placebo to reduce the progression from V1 to V7 (52 weeks) in striatal volume loss measured by MRI (3D MP-RAGE MRI volumetry, 3D FLAIR)	baseline to 52 weeks
Secondary	Clinical Safety and Tolerability of EGCG Measured by Death Rates	Clinical safety and tolerability of EGCG measured by number of deaths in EGCG- Group vs Placebo-Group	52 weeks
Secondary	Effect of Treatment (Epigallocatechin Gallate vs Placebo) on Safety and Tolerability: Discontinuation Rates Because of Hepatotoxicity	Effect of Treatment (Epigallocatechin Gallate vs Placebo) on Safety and Tolerability: Measured by Discontinuation rates because of hepatotoxicity (measured by increased aminotransferase concentrations)	52 weeks
Secondary	Number of Participants Achieving Each Clinical Global Impression of Severity (CGI-S): Illness Level at Visit 1	Clinical Global Impression of Severity (CGI-S) is a 7 item scale that requires the clinician to rate the severity of the patient's illness at the time of assessment.; Possible ratings are: Normal, not at all ill; Borderline mentally ill; Mildly ill; Moderately ill; Markedly ill; Severely ill; Among the most extremely ill patients	At baseline visit (max. 4 weeks after the screening visit)
Secondary	Number of Participants Achieving Each Clinical Global Impression of Severity (CGI-S): Illness Level at Visit 5	Clinical Global Impression of Severity (CGI-S) is a 7 item scale that requires the clinician to rate the severity of the patient's illness at the time of assessment.; Possible ratings are: Normal, not at all ill; Borderline mentally ill; Mildly ill; Moderately ill; Markedly ill; Severely ill; Among the most extremely ill patients	Visit 5 (30 weeks after Baseline Visit)
Secondary	Number of Participants Achieving Each Clinical Global Impression of Severity (CGI-S): Illness Level at Visit 6	Clinical Global Impression of Severity (CGI-S) is a 7 item scale that requires the clinician to rate the severity of the patient's illness at the time of assessment.; Possible ratings are: Normal, not at all ill; Borderline mentally ill; Mildly ill; Moderately ill; Markedly ill; Severely ill; Among the most extremely ill patients	48 weeks after baseline visit
Secondary	Number of Participants Achieving Each Clinical Global Impression of Severity (CGI-S): Illness Level at Visit 7	Clinical Global Impression of Severity (CGI-S) is a 7 item scale that requires the clinician to rate the severity of the patient's illness at the time of assessment..; Possible ratings are: Normal, not at all ill; Borderline mentally ill; Mildly ill; Moderately ill; Markedly ill; Severely ill; Among the most extremely ill patients	52 weeks after baseline visit
Secondary	Number of Participants Achieving Each Clinical Global Impression of Improvement (CGI-I): Improvement Level at Visit 7 Compared to the Baseline Visit	The Clinical Global Impression - Improvement scale (CGI-I) is a 7 point scale that requires the clinician to assess how much the patient's illness has improved or worsened relative to a baseline state at the beginning of the intervention. Compared to the patient's condition at baseline, this patient's condition has either improved or worsened or is unchanged, with a lower score meaning more improvement and a higher score less improvement or worsening respectively. The patient´s state compared to baseline is rated as: Very much improved; much improved; Minimally improved; No change; Minimally worse; Much worse 7 = Very much worse	Visit 7: 52 weeks after baseline visit
Secondary	Number of Participants Achieving Each Clinical Global Impression of Improvement (CGI-I): Efficacy Index (Therapeutic Effect of Treatment With Medication and Associated Side Effects) at Visit 7 Compared to the Baseline Visit	The Clinical Global Impression - Efficacy Index is a 4×4 rating scale that assesses the therapeutic effect of treatment with psychiatric medication and associated side effects.; It comprises 4 Items for the therapeutic effect: Marked - Vast improvement. Complete or nearly complete remission of all symptoms; Moderate - Decided improvement. Partial remission of symptoms; Minimal - Slight improvement which doesn't alter status of care of patient; Unchanged or worse combined with 4 items of possible side effects: 1= None - no side effects (S.E.) 2= Side effects (S.E.) do not significantly interfere with patient's functioning 3= S.E. significantly interfere with patient's functioning 4= S. E. outweigh therapeutic effect The lowest total score (score 1) means vast improvement with no side effects; the highest total score (score 16) means unchanged or worse patient´s condition with side effects that outweigh the therapeutic effect.	Visit 7: 52 weeks after baseline visit

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