Clinical trial NCT03274895: Polihexanide (PHMB) Eye Drops in Patients Affected by Acanthamoeba Keratitis
Official title: Randomized, Active-Controlled, Phase 3 Study to Evaluate Efficacy, Safety and Tolerability of 0.08% PHMB Ophthalmic Solution in Comparison With 0.02% PHMB + 0.1% Propamidine Combination Therapy in Subjects Affected by Acanthamoeba Keratitis
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE3
Conditions: Acanthamoeba Keratitis
Keywords: polihexanide
propamidine
confocal microscopy
Lead sponsor: SIFI SpA
Sponsor class: INDUSTRY
First posted: 2017-09-07
Enrollment: 135
Sex: ALL
Minimum age (years): 13
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: Prospective randomized study to evaluate the efficacy, safety and tolerability of 0.08% polihexanide (PHMB) eye drops in patients affected by acanthamoeba keratitis.

130 subjects were assigned to one of the following 2 treatment groups: Group 1: 0.08% polihexanide (PHMB) + placebo Group 2: 0.02% polihexanide (PHMB) + 0.1% propamidine

Detailed description: This was a randomized, assessor-masked, active-controlled, multiple center, parallel-group phase 3 study to evaluate the efficacy, safety and tolerability of 0.08% polihexanide (PHMB) ophthalmic solution compared to the conventional 0.02% polihexanide (PHMB) + 0.1% propamidine in patients affected by acanthamoeba keratitis.

The study was designed as a superiority study with the possibility to test for non-inferiority if the superiority hypothesis was not met (CPMP/EWP/482/99).The study consisted of an eligibility screening visit, a treatment period including monthly follow-up visits until a clinical resolution was obtained (within a maximum of 1 year), followed by 2 post-treatment off-therapy visits (30 and 90 days after treatment discontinuation). 130 subjects with confirmed diagnosis of acanthamoeba keratitis (clinical signs plus positive confocal microscopy findings) were assigned to one of the following treatment groups in a ratio of 1:1.

Group 1: 0.08% PHMB + placebo Group 2: 0.02% PHMB + 0.1% propamidine

Eligibility criteria: Inclusion Criteria:

1. willing to give informed consent
2. man or woman of any race and ≥12 years of age
3. able to understand and willing to comply with study procedures, restrictions and requirements
4. Clinical findings consistent with Acanthamoeba keratitis
5. Confocal microscopy findings consistent with Acanthamoeba keratitis
6. The following previous treatments for Acanthamoeba keratitis are eligible: antibiotics, antiviral and antifungal drugs, antiinflammatory drugs
7. Females of childbearing potential will be included if they are either sexually inactive or using one highly effective contraceptive
8. Females of childbearing potential agree to remain sexually inactive or to keep the same birth control method for at least 28 days following the last study drug dose
9. A female of non-childbearing potential must have undergone one sterilization procedures at least 6 months prior to the first study drug dose
10. A non-vasectomized male subject agrees to use a condom with spermicide or abstain from sexual intercourse during the study until 90 days beyond the last dose of study drug and the female partner agrees to comply with inclusion 7 or 8. For a vasectomized male who has had his vasectomy 6 months or more prior to study start, it is required that they use a condom during sexual intercourse. A male who has been vasectomized less than 6 months prior to study start must follow the same restrictions as a non-vasectomized male.
11. If male, they must agree not to donate sperm from the first study drug dose until 90 days after dosing

Exclusion Criteria:

1. Subject with documented history and/or clinical signs of concomitant presence of an ocular infection caused by viruses (herpes simplex virus \[HSV\]) or fungi.
2. Subject treated with drugs having effects on Acanthamoeba cysts prior to study entry, including biguanides (PHMB, chlorhexidine) and diamidines (propamidine, hexamidine).
3. Subjects requiring systemic immunosuppression for Acanthamoeba associated scleritis.
4. Subjects requiring urgent surgical intervention for advanced Acanthamoeba keratitis in either eye (e.g., for advanced corneal thinning/melting etc.).
5. Subject with known or suspected allergy to biguanides, diamidines or intolerance to any other ingredient of the investigational treatments.
6. Subject affected by immunodeficiency diseases or taking systemic immunosuppressive therapy.
7. Subject with a major systemic disease or other illness that would, in the opinion of the investigator, compromise subject's safety or interfere with the collection or interpretation of study results.
8. If female, pregnancy, planned pregnancy, or breast-feeding
9. Subject is participating in another interventional clinical study with an experimental or unapproved/unlicensed therapy or has participated in another interventional clinical study within 4 weeks prior to this study.

Primary outcomes:
measure: Clinical Resolution Rate
timeFrame: 12 months
Secondary outcomes:
measure: Time to Cure
timeFrame: maximum 12 months
measure: Visual Acuity
timeFrame: maximum 12 months
Other outcomes:
Locations:
city: Milano
country: Italy
facility: San Raffaele Hospital
city: Venice
country: Italy
facility: San Giovanni and Paolo Hospital
city: Katowice
country: Poland
facility: University Clinical Center Medical University of Silesia
city: London
country: United Kingdom
facility: Moorfields Hospital
city: Manchester
country: United Kingdom
facility: Manchester Royal Eye Hospital
city: Southampton
country: United Kingdom
facility: University Hospital Southampton
Study officials:
affiliation: Moorfield's Hospital London
name: John Dart, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Papa V, Rama P, Radford C, Minassian DC, Dart JKG. Acanthamoeba keratitis therapy: time to cure and visual outcome analysis for different antiamoebic therapies in 227 cases. Br J Ophthalmol. 2020 Apr;104(4):575-581. doi: 10.1136/bjophthalmol-2019-314485. Epub 2019 Aug 10.
citation: Papa V, van der Meulen I, Rottey S, Sallet G, Overweel J, Asero N, Minassian DC, Dart JKG. Safety and tolerability of topical polyhexamethylene biguanide: a randomised clinical trial in healthy adult volunteers. Br J Ophthalmol. 2022 Feb;106(2):190-196. doi: 10.1136/bjophthalmol-2020-317848. Epub 2020 Nov 25.