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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)

2026年11月5日 更新者: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.

調査の概要

状態

まだ募集していません

条件

介入・治療

研究の種類

介入

入学 (推定)

312

段階

  • フェーズ 3

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究連絡先

研究連絡先のバックアップ

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

75年歳以上 (高齢者)

健康ボランティアの受け入れ

いいえ

受講資格のある性別

女性

説明

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

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか?

デザインの詳細

  • 主な目的:処理
  • 割り当て:ランダム化
  • 介入モデル:並列代入
  • マスキング:なし(オープンラベル)

武器と介入

参加者グループ / アーム
介入・治療
実験的: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.

アクティブコンパレータ: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.

この研究は何を測定していますか?

主要な結果の測定

結果測定
メジャーの説明
時間枠
Clinical resolution
時間枠: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

二次結果の測定

結果測定
メジャーの説明
時間枠
Occurence of antibiotic-related adverse events
時間枠: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
時間枠: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
時間枠: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
時間枠: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)
時間枠: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
時間枠:Up to day 37
Up to day 37
Length of hospital stay following randomization
時間枠:Up to day 37
Up to day 37
All-cause mortality
時間枠:Up to day 37
Up to day 37
Rate of rectal colonization with antibiotic-resistant Enterobacterales
時間枠:Up to day 37

fluoroquinolones, trimethoprim-sulfamethoxazole, fosfomycin, and third-generation cephalosporins

Up to day 37

協力者と研究者

ここでは、この調査に関係する人々や組織を見つけることができます。

スポンサー

研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (推定)

2026年12月1日

一次修了 (推定)

2030年1月17日

研究の完了 (推定)

2030年2月15日

試験登録日

最初に提出

2026年10月29日

QC基準を満たした最初の提出物

2026年11月5日

最初の投稿 (実際)

2026年11月10日

学習記録の更新

投稿された最後の更新 (実際)

2026年11月10日

QC基準を満たした最後の更新が送信されました

2026年11月5日

最終確認日

2026年10月1日

詳しくは

本研究に関する用語

その他の研究ID番号

  • APHP240802

個々の参加者データ (IPD) の計画

個々の参加者データ (IPD) を共有する予定はありますか?

未定

医薬品およびデバイス情報、研究文書

米国FDA規制医薬品の研究

いいえ

米国FDA規制機器製品の研究

いいえ

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