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Fosfomycin Trometamol Compared With an Alternative Active Antibiotic as Step-down Therapy for the Treatment of Acute Pyelonephritis Due to Escherichia Coli in Elderly Women : a Randomized, Multicenter, Non-inferiority Trial (FOSFOLD)

5 novembre 2026 aggiornato da: Assistance Publique - Hôpitaux de Paris

Fosfomycine trométamol comparé à un Autre Traitement Antibiotique Actif en Relais Pour le Traitement Des pyélonéphrites aiguës à Escherichia Coli Chez Les Femmes âgées : Essai randomisé, Multicentrique de Non infériorité

Acute pyelonephritis (APN) is among the most common bacterial infections in older women. Oral step-down antibiotic therapy may potentially be associated with toxicity, particularly with fluoroquinolones or trimethoprim-sulfamethoxazole, espcially in geriatric patients. The emergence of resistant strains reduces the choice of oral step-down treatment, thereby increasing the risk of nosocomial complications related to intravenous access and prolonged hospitalization.

Fosfomycin trometamol (FT) has broad activity against Enterobacterales, including resistant strains. It has an excellent safety profile and moderate ecological impact, and has been used for several years to treat cystitis. Recent studies have demonstrated its efficacy as an oral step-down therapy for the treatment of E.coli APN in younger women. Its efficacy in a geriatric population remains to be demonstrated.

The primary objective is to demonstrate the non-inferiority, in terms of clinical cure, of FT compared with an alternative active antibiotic as step-down therapy for E. coli APN in older women.

FOSFOLD is a national, multicenter, randomised, comparative, phase 3, non-inferiority trial (1:1), open-label with two parallel treatment groups. After 3 or 4 days of appropriate empirical antibiotic therapy, women aged 75 or over with E.coli APN will be randomised to receive either 3g of FT once daily or an alternative antibiotic treatment in accordance with current french guidelines, for a total of 10 days.

The primary endpoint is clinical cure at Day 17, i.e. 10 days after completion of antibiotic therapy.

If non-inferiority of FT is confirmed, it could provide a new therapeutic approach for oral step-down therapy in the older patients with APN. Its favorable tolerability profile could help prevent common geriatric complications, such as delirium, falls and malnutrition. Ultimately, it could help prevent some of the iatrogenic functional decline associated with hospitalisation.

Panoramica dello studio

Stato

Non ancora reclutamento

Condizioni

Intervento / Trattamento

Tipo di studio

Interventistico

Iscrizione (Stimato)

312

Fase

  • Fase 3

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Backup dei contatti dello studio

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

75 anni e precedenti (Adulto più anziano)

Accetta volontari sani

No

Sessi ammissibili allo studio

Femmina

Descrizione

Inclusion Criteria:

  1. Female.
  2. Age ≥ 75 years.
  3. Body temperature ≥ 38°C on at least once during the 72 hours preceding diagnosis.
  4. At least one new symptom among the following : urinary urgency, dysuria, increased urinary frequency, gross hematuria, burning on urination, spontaneous of provoked flank or suprapubic pain or urinary incontinence.
  5. Positive urine culture collected before initiation of antibiotic therapy defined as : ≥ 10,000 leukocytes/mL and monomicrobial culture with Escherichia coli ≥ 103 CFU/mL and susceptibility to FT,the empirical antibiotic,and at least one alternative antibiotic (active and not contraindicated), administered either orally (fluoroquinolone, amoxicillin, amoxicillin-clavulanic acid, or trimethoprim-sulfamethoxazole or, in the absence of an oral alternative, intravenously.
  6. Ability to reveive oral medication
  7. Favorable clinical course after 3 or 4 days of effective empirical antibiotic therapy, defined as resolution of fever (temperature < 38°C) and regression or reduction in the intensity and/or frequency of the clinical sign(s) present at the time of APN diagnosis, without the occurrence of any new symptoms.

Exclusion Criteria:

  1. Presence of an infectious focus other than the urinary tract.
  2. Severe infection and/or initial infectious complications, including septic shock, requirement for an emergency upper urinary tract intervention, or renal abscess.
  3. Indwelling urinary catheter, including bladder, ureteral, or nephrostomy catheters.
  4. Inability to take oral medication.
  5. Immunosuppression, including sold-organ transplant, ongoing immunosuppressive therapy, ongoing chemotherapy.
  6. Hypersensitivity to fosfomycin trometamol or to any of the excipients of the study medication
  7. End-stage chronic kidney disease with an estimated glomerular filtration rate (eGFR) < 15 mL/min/1.73 m2.
  8. Lack of health insurance coverage.
  9. Patient under legal protection or guardianship.
  10. Absence of written informed consent from the patient or, if the patient is unable to provide consent, absence of agreement from the designated trusted person or a close relative.
  11. Participation in another interventional clinical research protocole

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Fosfomycin-trometamol (FT)
Droga: Fosfomycin-trometamol (FT)

One sachet (3g), once daily, orally for 6 or 7 days, following 4 or 3 days, respectivelly of effective antibiotic therapy, for a total of 10 days of effective antibiotic treatment.
Comparatore attivo: Alternative antibiotic treatment
Droga: Alternative antibiotic treatment

Treatment will be selected at the investigator's discretion, in accordance with the 2017 recommandations of the French Society for Infectious Diseases (SPILF) and the 2025 French National Authority for Health (HAS) guidelines. Therapy will be administrated for 6 or 7 days (Day 1 - Day 6/7), following 4 or 3 days, respectively of effective antibiotic therapy. The total duration of effective antibiotic therapy will be 10 days. Injection antibiotic therapy will be offered in the absence of an active oral antibiotic option.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Clinical resolution
Lasso di tempo: Day 17

Clinical cure defined as :

  • Body temperature < 38 °C and resolution of all urinary symptoms present at the time of the APN diagnosis, with no occurrence of new clinical signs (urinary urgency, dysuria, increased urinary frequency, gross hematuria, painful/burningurination, flank pain [spontaneous or provoked], suprapubic pain, or urinary incontinence) between treatment discontinuation and assessment of the primary endpoint at Day 17, except for a temperature ≥ 38°C unrelated to a urinary tract condition
  • No resumption of antibiotic therapy active against the causative pathogen responsible for the APN following completion of the antibiotic treatment course
Day 17

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Occurence of antibiotic-related adverse events
Lasso di tempo: Up to 37 days

Occurrence, nature, and severity of antibiotic-related adverse events, assessed using the National Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE) scale.
Up to 37 days
Occurence of geriatric complications
Lasso di tempo: Up to 37 days
  • Occurrence of delirium, defined according the Confusion Assessment Method (CAM)
  • Fall(s) (one or more episodes)
  • Weight loss, assessed as the percentage change between admission body weight and discharge body weight or Day 17 weight if the patient remains hospitalized
  • Occurrence of pressure ulcers, staged according to the National Pressure Ulcer Advisory Panel (NPUAP) pressure ulcer staging classification (HAS Guidelines, Prevention and Treatment of Pressure Ulcers in Adults and Older Persons, 2001)
Up to 37 days
Functional autonomy
Lasso di tempo: Up to 37 days

According to the Activities of Daily Living (ADL) scale: score ranges from 0 (complete dependence) to 6 (complete independence), with higher scores indicating greater independence in basic daily activities such as bathing, dressing, toileting, transferring and eating.
Up to 37 days
Incidence of Infectious and urological complications
Lasso di tempo: Up to day 7
  • Renal abscess (yes/no)
  • Need for urinary drainage
  • Transfer to an continuous care unit or intensive care unit due to the infection At the end of antibiotic treatment (Day 7)
Up to day 7
Cumulative incidence of recurrent febrile or non-febrile urinary tract infectious (UTIs) (relapse or reinfection)
Lasso di tempo: From Day 17 to Day 37
  • Cystitis : recurrence of urinary symptoms in the absence of fever, associated with a positive urine culture.
  • Acute pyelonephritis :; recurrence of urinary symptoms with fever and a positive urine culture.
  • Reinfection : new infection caused by a microorganism different from that isolated during the initial episode.
  • Relapse : recurrence of infection due to the same microorganism as that isolated during the initial episode.
From Day 17 to Day 37
Rate of hospitalization or rehospitalization following treatment for APN
Lasso di tempo: Up to day 37
Up to day 37
Length of hospital stay following randomization
Lasso di tempo: Up to day 37
Up to day 37
All-cause mortality
Lasso di tempo: Up to day 37
Up to day 37
Rate of rectal colonization with antibiotic-resistant Enterobacterales
Lasso di tempo: Up to day 37

fluoroquinolones, trimethoprim-sulfamethoxazole, fosfomycin, and third-generation cephalosporins
Up to day 37

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Assistance Publique - Hôpitaux de Paris

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Stimato)

1 dicembre 2026

Completamento primario (Stimato)

17 gennaio 2030

Completamento dello studio (Stimato)

15 febbraio 2030

Date di iscrizione allo studio

Primo inviato

29 ottobre 2026

Primo inviato che soddisfa i criteri di controllo qualità

5 novembre 2026

Primo Inserito (Effettivo)

10 novembre 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

10 novembre 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

5 novembre 2026

Ultimo verificato

1 ottobre 2026

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • APHP240802

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

INDECISO

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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