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Bacterial InfectionsPhase 3NCT02378480

Omadacycline Versus Linezolid for the Treatment of ABSSSI (EudraCT #2013-003644-23)

A Phase 3 study testing Omadacycline and Linezolid in people with Bacterial Infections and Skin Structures and Soft Tissue Infections, run by Paratek Pharmaceuticals Inc at 78 sites in 14 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The purpose of this study is to evaluate the safety and efficacy of omadacycline as compared to linezolid in the treatment of adults with acute bacterial skin and skin structure infections. Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Omadacycline and Linezolid
Could I receive a placebo?
No, everyone receives an active treatment
How many people
655 participants
Where
78 sitesin 14 countries
Study dates
Jun 2015to May 2016
Phase
Phase 3
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patients, ages 18 years or older who have signed the informed consent
  • Has a qualifying skin and skin structure infection
  • Female patients must not be pregnant at the time of enrollment
  • Must agree to a reliable method of birth control during the study and for 30 days following the last dose of study drug

Who cannot join

  • Infections where the outcome is strongly influenced by factors other than protocol-defined treatment and procedures, that require antibacterial treatment for greater than 14 days
  • Evidence of significant immunological disease
  • Severe sepsis or septic shock
  • Has a history of hypersensitivity or allergic reaction to any tetracycline or to linezolid
  • Has received an investigational drug within past 30 days
  • Women who are pregnant or nursing

Trial locations and contacts

78 sites in 14 countries.

78 sites in 14 countries

United States18 sites
  • Site 256

    Augusta, Georgia, 30909

  • Site 273

    Buffalo, New York, 14215

  • Site 266

    Butte, Montana, 59701

  • Site 262

    Chula Vista, California, 91911

  • Site 253

    Columbus, Georgia, 31904

  • Site 268

    Detroit, Michigan, 48202

  • Site 254

    La Mesa, California, 91942

  • Site 263

    Las Vegas, Nevada, 89119

  • Site 259

    Miami, Florida, 33144

  • Site 261

    Mobile, Alabama, 36608

  • Site 258

    Oceanside, California, 92056

  • Site 255

    Rapid City, South Dakota, 57702

  • Site 252

    Santa Ana, California, 92705

  • Site 260

    Santa Ana, California, 92705

  • Site 270

    Somers Point, New Jersey, 08244

  • Site 257

    Springfield, Massachusetts, 01199

  • Site 269

    Stockton, California, 95204

  • Site 264

    West Palm Beach, Florida, 33407

Other trials in United States

Ukraine9 sites
  • Site 172

    Dnipropetrovsk

  • Site 173

    Dnipropetrovsk

  • Site 179

    Kharkiv

  • Site 171

    Kyiv

  • Site 170

    Lviv

  • Site 174

    Odesa

  • Site 175

    Uzhhorod

  • Site 178

    Vinnytsia

  • Site 176

    Zaporizhia

Other trials in Ukraine

Romania7 sites
  • Site 141

    Bucharest

  • Site 142

    Bucharest

  • Site 146

    Bucharest

  • Site 144

    Cluj-Napoca

  • Site 140

    Craiova

  • Site 143

    Târgu Mureş

  • Site 145

    Timișoara

Other trials in Romania

Peru6 sites
  • Site 234

    Cusco

  • Site 233

    Lima

  • Site 236

    Lima

  • Site 238

    Lima

  • Site 239

    Lima

  • Site 237

    Trujillo

Other trials in Peru

Bulgaria5 sites
  • Site 104

    Pleven

  • Site 102

    Plovdiv

  • Site 105

    Plovdiv

  • Site 103

    Rousse

  • Site 101

    Sofia

Other trials in Bulgaria

Croatia5 sites
  • Site 205

    Slavonski Brod

  • Site 201

    Zagreb, 10000

  • Site 203

    Zagreb, 10000

  • Site 202

    Zagreb

  • Site 204

    Zagreb

Other trials in Croatia

Latvia5 sites
  • Site 122

    Daugavpils

  • Site 123

    Liepāja

  • Site 124

    Rēzekne

  • Site 120

    Riga

  • Site 121

    Riga

Other trials in Latvia

Poland5 sites
  • Site 130

    Bydgoszcz

  • Site 133

    Katowice

  • Site 131

    Lodz

  • Site 134

    Olsztyn

  • Site 132

    Warsaw

Other trials in Poland

Greece4 sites
  • Site 207

    Athens

  • Site 211

    Athens

  • Site 208

    Thessaloniki

  • Site 209

    Thessaloniki

Other trials in Greece

Hungary4 sites
  • Site 110

    Budapest

  • Site 111

    Budapest

  • Site 114

    Miskolc

  • Site 113

    Szeged

Other trials in Hungary

Israel4 sites
  • Site 213

    Holon

  • Site 219

    Kfar Saba

  • Site 214

    Nazareth

  • Site 216

    Safed

Other trials in Israel

South Africa2 sites
  • Site 241

    Benoni, Gauteng

  • Site 244

    Thabazimbi, Limpopo

Other trials in South Africa

Spain2 sites
  • Site 221

    Barcelona, Catalonia

  • Site 222

    Terrassa, Barcelona

Other trials in Spain

Turkey (Türkiye)2 sites
  • Site 247

    Ankara

  • Site 246

    Trabzon

Other trials in Turkey (Türkiye)

About this study

Official title: A Phase 3 Randomized, Double-blind, Multi-center Study to Compare the Safety and Efficacy of Omadacycline IV/PO to Linezolid IV/PO for Treating Adults With Acute Bacterial Skin and Skin Structure Infections (ABSSSI)

The purpose of this study is to evaluate the safety and efficacy of omadacycline as compared to linezolid in the treatment of adults with acute bacterial skin and skin structure infections.

Being tested
Omadacycline, Linezolid
Medical subject headings
Bacterial Infections, Soft Tissue Infections

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • OmadacyclineDrug

    Injection for IV dosing; Tablets for oral dosing

  • LinezolidDrug

    Also called Zyvox

    Infusion solution for IV dosing; Tablets for oral dosing

Study groups in NCT02378480
Study groupRoleWhat they receive
OmadacyclineExperimentalOmadacycline IV; Omadacycline tablets
Receives: Drug: Omadacycline
LinezolidActive comparatorLinezolid IV; Linezolid tablets
Receives: Drug: Linezolid

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants With Early Clinical Response

    Early clinical response is defined as clinical success, which is categorized as survival with at least a 20% reduction of acute bacterial skin and skin structure infection (ABSSSI) primary lesion size compared to Screening measurements, without receiving any rescue antibacterial therapy. An indeterminate classification is used for a response that could not be adequately inferred because the participant was not assessed because they withdrew consent, were lost to follow-up, or other specified reason.

    Measured: Screening; 48 to 72 hours after the first dose of test article

Secondary outcomes (3)
  1. Number of Participants With the Indicated Investigator Assessment of Clinical Response in the mITT Population at the Post Therapy Evaluation (PTE) Visit

    At the PTE Visit the investigator indicated one of the following outcomes relating to the primary infection under study: Clinical Success: participant was alive; the infection was sufficiently resolved such that further antibacterial therapy was not needed. These participants may have had some residual changes related to infection requiring ancillary treatment. Clinical Failure was defined as meeting any of the following criteria: infection required additional treatment with alternative antibacterial therapy; participant received antibacterial therapy between the End-of-Treatment (EOT) Visit and the PTE Visit that may have been effective for the infection under study for a different infection from the one under study; unplanned major surgical intervention for the infection under study between the EOT and PTE Visits; participant died before evaluation. Indeterminate: clinical response to test article could not be adequately inferred.

    Measured: Screening; 7 to 14 days after the last day of therapy

  2. Number of Participants With the Indicated Investigator Assessment of Clinical Response in the Clinically Evaluable-Post Therapy Evaluation (CE-PTE) Population

    At the PTE Visit the investigator indicated one of the following outcomes relating to the primary infection under study: Clinical Success: participant was alive; the infection was sufficiently resolved such that further antibacterial therapy was not needed. These participants may have had some residual changes related to infection requiring ancillary treatment. Clinical Failure was defined as meeting any of the following criteria: infection required additional treatment with alternative antibacterial therapy; participant received antibacterial therapy between the EOT Visit and the PTE Visit that may have been effective for the infection under study for a different infection from the one under study; unplanned major surgical intervention for the infection under study between the EOT and PTE Visits; participant died before evaluation.

    Measured: Screening; 7 to 14 days after the last day of therapy

  3. Number of Participants With the Indicated Type of Adverse Event (AE)

    An AE is defined as any untoward, undesired, or unplanned event in the form of signs, symptoms, disease, or laboratory or physiologic observations occurring in a person given a test article or in a clinical study. The event does not need to be causally related to the test article or clinical study. A serious adverse event (SAE) is defined as an event that resulted in death, was life-threatening, required hospitalization or prolongation of an existing hospitalization, resulted in a persistent or significant disability or incapacity, resulted in cancer, or resulted in a congenital anomaly or birth defect. A treatment-emergent AE (TEAE) is defined as any AE that newly appeared, increased in frequency, or worsened in severity on or after the initiation of active test article. Vital sign measurements, electrocardiogram findings, and laboratory values classified as adverse events were included in the analysis. Data are presented as the number of participants with at least 1 of the event.

    Measured: 0 to 37 days

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted4 Mar 2015 (estimated)
  2. Study startJun 2015
  3. Primary completionApr 2016
  4. Study completionMay 2016

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Triple blind
Who is masked
Participant, Investigator, Outcomes assessor
Enrolment
655 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT02378480
Sponsor's protocol ID
PTK0796-ABSI-1108
Status last verified
Mar 2019
First submitted
19 Feb 2015
Last updated
21 Mar 2019
Data monitoring committee
Yes

Publications

  • Rodriguez GD, Warren N, Yashayev R, Chitra S, Amodio-Groton M, Wright K. Intravenous Versus Oral Omadacycline or Linezolid for Acute Bacterial Skin and Skin Infections: A post hoc Analysis of the OASIS Trials. Infect Dis Ther. 2024 Dec;13(12):2637-2648. doi: 10.1007/s40121-024-01057-3. Epub 2024 Oct 26.

    PubMed 39461915
  • Vacalis S, Brunton S, Gindi J. Omadacycline in Skin Infections and Pneumonia: A Review of the Evidence. J Fam Pract. 2022 Jun;71(5 Suppl):S10-S21. doi: 10.12788/jfp.0424.

    PubMed 35776862
  • Pai MP, Wilcox MH, Chitra S, McGovern PC. Safety and efficacy of omadacycline by BMI categories and diabetes history in two Phase III randomized studies of patients with acute bacterial skin and skin structure infections. J Antimicrob Chemother. 2021 Apr 13;76(5):1315-1322. doi: 10.1093/jac/dkaa558.

    PubMed 33458763
  • Cornely OA, File TM Jr, Garrity-Ryan L, Chitra S, Noble R, McGovern PC. Safety and efficacy of omadacycline for treatment of community-acquired bacterial pneumonia and acute bacterial skin and skin structure infections in patients with mild-to-moderate renal impairment. Int J Antimicrob Agents. 2021 Feb;57(2):106263. doi: 10.1016/j.ijantimicag.2020.106263. Epub 2020 Dec 14.

    PubMed 33326848
  • Abrahamian FM, Sakoulas G, Tzanis E, Manley A, Steenbergen J, Das AF, Eckburg PB, McGovern PC. Omadacycline for Acute Bacterial Skin and Skin Structure Infections. Clin Infect Dis. 2019 Aug 1;69(Suppl 1):S23-S32. doi: 10.1093/cid/ciz396.

    PubMed 31367742
  • O'Riordan W, Green S, Overcash JS, Puljiz I, Metallidis S, Gardovskis J, Garrity-Ryan L, Das AF, Tzanis E, Eckburg PB, Manley A, Villano SA, Steenbergen JN, Loh E. Omadacycline for Acute Bacterial Skin and Skin-Structure Infections. N Engl J Med. 2019 Feb 7;380(6):528-538. doi: 10.1056/NEJMoa1800170.

    PubMed 30726689

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing Omadacycline and Linezolid in people with Bacterial Infections and Skin Structures and Soft Tissue Infections, run by Paratek Pharmaceuticals Inc at 78 sites in 14 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 21 Mar 2019. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 78 sites in United States, Ukraine, Romania, Peru, Bulgaria and 9 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 21 Mar 2019). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants With Early Clinical Response (time frame: Screening; 48 to 72 hours after the first dose of test article). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT02378480, which also lists 6 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Mar 2019.

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