Clinical Trial Results:
A Double-Masked, Placebo-Controlled, Dose Ranging Study to Evaluate the Efficacy of Oral AKST4290 with Loading Doses of Aflibercept in Patients with Newly Diagnosed Neovascular Age-Related Macular Degeneration (PHTHALO – 205)
Summary
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EudraCT number |
2019-002738-36 |
Trial protocol |
HU DE |
Global end of trial date |
16 Sep 2021
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Results information
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Results version number |
v1(current) |
This version publication date |
28 Mar 2023
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First version publication date |
28 Mar 2023
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Other versions |
Trial Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
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Trial identification
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Sponsor protocol code |
AKST4290-205
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Additional study identifiers
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ISRCTN number |
- | ||
US NCT number |
NCT04331730 | ||
WHO universal trial number (UTN) |
- | ||
Sponsors
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Sponsor organisation name |
Alkahest, Inc.
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Sponsor organisation address |
125 Shoreway Road, Suite D, San Carlos, United States, CA 94070
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Public contact |
Head of Communications, Alkahest, Inc. , +1 650801-0474, trials@alkahest.com
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Scientific contact |
Head of Communications, Alkahest, Inc. , +1 6508801-0474, trials@alkahest.com
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Paediatric regulatory details
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Is trial part of an agreed paediatric investigation plan (PIP) |
No
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Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Results analysis stage
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Analysis stage |
Final
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Date of interim/final analysis |
22 Sep 2022
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Is this the analysis of the primary completion data? |
Yes
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Primary completion date |
16 Sep 2021
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Global end of trial reached? |
Yes
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Global end of trial date |
16 Sep 2021
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Was the trial ended prematurely? |
No
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General information about the trial
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Main objective of the trial |
The primary objective of the study is to evaluate the potential therapeutic effects of a 36-week, b.i.d. oral dosing regimen of AKST4290, with loading doses of IAI, by assessing the improvement in best-corrected visual acuity (BCVA) using the Early Treatment Diabetic Retinopathy Study (ETDRS) method. Mean Change From Baseline in Best Corrected Visual Acuity (BCVA) Per the Early Treatment Diabetic Retinopathy Study (ETDRS) Testing Method [Time Frame: Baseline to
Week 36]
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Protection of trial subjects |
Subject information obtained during the conduct of the study was regarded as confidential. The
collection and processing of personal data from subjects enrolled in this study was limited to those
data that are necessary to investigate the efficacy, safety, quality, and utility of the investigational
product(s) used in this study. Prior to initiation of any study-specific procedures, subjects received a copy of the IEC/IRB approved updated version of the Informed Consent Form (ICF) that summarized, in non-technical terms, the purpose of the study, the procedures to be carried out, and the potential hazards. The PI or authorized representative explained the nature of the study to the subjects, in non-technical terms, and answered all questions regarding the study. Subjects reviewed, signed, and dated the ICF. Subjects received a copy of the fully signed ICF. The subject was given adequate time to read the ICF and the opportunity to ask questions and consider the statement before signing and dating the form. They were also given a copy of the signed document. No subject entered the studybefore informed consent was obtained. The date the ICF was signed was recorded, and the investigator retained a copy of the signed ICF.
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Background therapy |
Subjects will receive 400 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment Or 800 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment Or placebo for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||
Evidence for comparator |
- | ||
Actual start date of recruitment |
19 Jan 2020
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Long term follow-up planned |
No
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Independent data monitoring committee (IDMC) involvement? |
No
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Population of trial subjects
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Number of subjects enrolled per country |
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Country: Number of subjects enrolled |
Poland: 87
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Country: Number of subjects enrolled |
United States: 7
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Country: Number of subjects enrolled |
Hungary: 13
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Worldwide total number of subjects |
107
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EEA total number of subjects |
100
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Number of subjects enrolled per age group |
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In utero |
0
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Preterm newborn - gestational age < 37 wk |
0
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Newborns (0-27 days) |
0
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Infants and toddlers (28 days-23 months) |
0
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Children (2-11 years) |
0
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Adolescents (12-17 years) |
0
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Adults (18-64 years) |
12
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From 65 to 84 years |
80
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85 years and over |
15
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Recruitment
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Recruitment details |
Men and women with newly diagnosed active Choroidal Neovascularization (CNV) secondary to Age Related Macular Degeneration (AMD), diagnosed by a retinal specialist with all the following characteristics and ophthalmic inclusion criteria applied to the study eye, as assessed by a central reader: | ||||||||||||||||||||||||||||
Pre-assignment
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Screening details |
Central subfield thickness (CST) thickness ≥ 250 microns on SD-OCT (spectral domain OCT) (exclusive of subretinal pigment epithelial fluid, inclusive of SRF). Presence of SRF (subretinal fluid) and/or IRF (intraretinal fluid) on SD-OCT. Total lesion size not greater than 12 disc areas (30.48 mm2) (1 disc area = 2.54 mm2) on FA | ||||||||||||||||||||||||||||
Period 1
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Period 1 title |
treatment (overall period)
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Is this the baseline period? |
Yes | ||||||||||||||||||||||||||||
Allocation method |
Randomised - controlled
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Blinding used |
Double blind | ||||||||||||||||||||||||||||
Roles blinded |
Subject, Investigator, Monitor, Data analyst, Carer, Assessor | ||||||||||||||||||||||||||||
Arms
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Are arms mutually exclusive |
Yes
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Arm title
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AKST4290 (800 mg) + Aflibercept | ||||||||||||||||||||||||||||
Arm description |
Subjects will receive 400 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||||||||||||||||||||||||||||
Arm type |
Experimental | ||||||||||||||||||||||||||||
Investigational medicinal product name |
AKST4290
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Investigational medicinal product code |
AKST4290
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Other name |
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Pharmaceutical forms |
Film-coated tablet
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Routes of administration |
Oral use
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Dosage and administration details |
Subjects will receive 400 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment
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Arm title
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AKST4290 (1600 mg) + Aflibercept | ||||||||||||||||||||||||||||
Arm description |
Subjects will receive 800 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||||||||||||||||||||||||||||
Arm type |
Experimental | ||||||||||||||||||||||||||||
Investigational medicinal product name |
AKST4290
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Investigational medicinal product code |
AKST4290
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Other name |
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Pharmaceutical forms |
Film-coated tablet
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Routes of administration |
Oral use
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Dosage and administration details |
Subjects will receive 800 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment
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Arm title
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Placebo + Aflibercept | ||||||||||||||||||||||||||||
Arm description |
Subjects will receive Placebo twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||||||||||||||||||||||||||||
Arm type |
Placebo | ||||||||||||||||||||||||||||
Investigational medicinal product name |
Placebo
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Investigational medicinal product code |
Placebo
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Other name |
Placebo
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Pharmaceutical forms |
Film-coated tablet
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Routes of administration |
Oral use
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Dosage and administration details |
Subjects will receive Placebo twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment
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Baseline characteristics reporting groups
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Reporting group title |
AKST4290 (800 mg) + Aflibercept
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Reporting group description |
Subjects will receive 400 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
AKST4290 (1600 mg) + Aflibercept
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Reporting group description |
Subjects will receive 800 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
Placebo + Aflibercept
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Reporting group description |
Subjects will receive Placebo twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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End points reporting groups
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Reporting group title |
AKST4290 (800 mg) + Aflibercept
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Reporting group description |
Subjects will receive 400 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||
Reporting group title |
AKST4290 (1600 mg) + Aflibercept
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Reporting group description |
Subjects will receive 800 mg AKST4290 twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment | ||
Reporting group title |
Placebo + Aflibercept
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Reporting group description |
Subjects will receive Placebo twice daily for 36 weeks, in combination with intravitreal aflibercept injection treatment |
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End point title |
Mean Change From Baseline in Best Corrected Visual Acuity (BCVA)Per the Early Treatment Diabetic Retinopathy Study (ETDRS) TestingMethod [1] | ||||||||||||||||
End point description |
Mean change from baseline in Best Corrected Visual Acuity (BCVA)per the Early Treatment Diabetic Retinopathy Study (ETDRS) testingmethod. BCVA will be assessed using ETDRS charts at 4 meters initialtesting distance and assessed in both eyes. Score range is 0 to 93. A higher score indicates better vision.
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End point type |
Primary
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End point timeframe |
Baseline to Week 36
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Notes [1] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point. Justification: This study was not powered for detecting clinically meaningful statistically significant differences. This study was conducted to identify trends and reinforce previous study results prior to conducting a study of longer treatment duration with a bigger sample size. |
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No statistical analyses for this end point |
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Adverse events information
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Timeframe for reporting adverse events |
AEs were captured beginning at time of informed consent through
EOS. AE status was followed by the investigator until resolved or
considered stable, unless the subject was lost to follow up
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Assessment type |
Systematic | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary used for adverse event reporting
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Dictionary name |
MedDRA | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary version |
21.1
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Reporting groups
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Reporting group title |
treatment-emergent AE (TEAEs) AKST4290 (800 mg) + Aflibercept
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Reporting group description |
Number of Subjects Reporting at Least One TEAE | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
treatment-emergent AE (TEAEs) AKST4290 (1600 mg) + Aflibercept
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Reporting group description |
- | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
treatment-emergent AE (TEAEs) Placebo + Aflibercept
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Reporting group description |
- | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Frequency threshold for reporting non-serious adverse events: 5% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Substantial protocol amendments (globally) |
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Were there any global substantial amendments to the protocol? Yes | |||
Date |
Amendment |
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20 Jan 2020 |
Main changes
1.Study extended with a final visit at 40 weeks to gather further data related to safety and efficacy.
2. FAF was added to FP as it’s a noninvasive technique which assists in delineation of changes in retinal structures; FP/FAF testing was added at week 40 (Visit 12) to gather further data related to efficacy
3. Revised to accommodate expansion of global study sites.
4. PRN Criteria were revised for alignment with recent research findings and to be consistent with other recent global clinical trials in nAMD.
5. Some Inclusion Criteria were updated to align with global regulatory standards
6. Some Exclusion Criteria were updated to align with global regulatory standards
7. Clarification of participant replacement when withdrawn due to AEs or adverse reactions based on study procedures.
8.Content added/revised related to prohibited medications as well as medications that should be administered with caution.
9. Revised the Schedule of Events to reduce burden on subjects and sites
10.Added acquisition of biomarker to new Visit 12 to align with collection timepoint of other exploratory
endpoints
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12 Jun 2020 |
The main changes
1. Study endpoints were updated (primary , secondary and exploratory ) - updates required for alignment with revised statistical approach and analyses (e.g., examining treatment arms separately) as well as clarity/consistency. In addition, FAF is not available at every site; therefore, it will be performed, as available.
2. Study population was updated to include 120 enrolled subjects (previously 150) with the intent of obtaining approximately 100 evaluable subjects (previously 129) to provide approximately 33 subjects in each study arm (previously 43)
3.Randomization remains 1:1:1, but will now also be stratified by site and baseline BCVA group (< 55 letters read or ≥ 55 letters read).
4.The statistical analyses were extensively updated. Key revisions include examination of each treatment arm separately (previously pooled)
5.PRN Criterion #3 was revised to provide clarity and for alignment with study visit procedures
6.Clarification of terminology and inclusion of assessment in visit schedule
7 As the study sites may be located in EU or US; therefore, appropriate manufacturing and labelling information was added for each.
8. Additional PK assessments added to better understand and characterize the bioavailability of AKST4290
9. New content added to account for potential protocol deviations related to COVID-19.
10. Additional updates to Section 15 Schedule of Events to facilitate study operations and decrease the burden on subjects.
11.Reduction in listings of prohibited medications by removing entries for conditions that are excluded in the study.
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Interruptions (globally) |
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Were there any global interruptions to the trial? No | |||
Limitations and caveats |
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Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data. | |||
None reported |