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Forebygging av opioid-indusert obstipasjon hos pasienter med metastatisk kreft (OMAMA)

30. september 2026 oppdatert av: Lia van Zuylen, Amsterdam UMC, location VUmc

OMAMA-studie - Forebygging av opioid-indusert obstipasjon hos pasienter med metastatisk kreft

More than 70% of patients with cancer in the palliative phase have pain that often requires treatment with opioids (morphine-like agents). Constipation occurs in 59% of patients treated with opioids. Opioid-induced constipation (OIC) has consequences that range from daily discomfort with social insecurity and disability to intestinal obstruction. It leads to limitations in self-management, a reduced quality of life and a risk of the need for more care. In the guideline "Diagnosis and treatment of pain in patients with cancer" it is recommended to start preventively with an osmotic laxative such as macrogol/electrolytes or magnesium hydroxide when starting opioids. Macrogol/electrolytes has been proven to be effective for OIC, but is sometimes perceived by patients as unpleasant due to its taste. Magnesium hydroxide, which is less commonly prescribed for OIC, has a neutral taste. Although it is mentioned in the guideline, it is not studied for the treatment of OIC and also not officially registered for this. To support the advice of the guideline and to prove that a choice is possible, it is important to investigate whether there are differences in effectiveness and/or side effects between macrogol/electrolytes and magnesium hydroxide in the prevention of OIC.

The aim of this study is to compare macrogol/electrolytes with magnesium hydroxide in the prevention of opioid-induced constipation in patients with cancer in the palliative (incurable) phase, who start opioids because of pain. The choice of laxative is determined by drawing lots (randomisation). After two weeks, its effect will be assessed and will be presented as the percentage of patients who have not developed constipation after starting opioids. If the laxative, as assigned by lot, is described as satisfactory by the patient, the patient can continue with the drug that the patient used, after the study through regular prescription.

The investigators will ask the patients in the study about their satisfaction with the laxative used, any side effects and the degree of pain. Furthermore, the appeal to care for possible constipation will be examined. Because the best attainable quality of life in the palliative phase is the objective of all care, the investigators will also measure this perceived quality with a questionnaire in this study. The results of this study will lead to the best achievable prevention of opioid constipation in patients with cancer in the palliative phase.

Studieoversikt

Status

Rekruttering

Forhold

Intervensjon / Behandling

Studietype

Intervensjonell

Registrering (Antatt)

258

Fase

  • Fase 4

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studer Kontakt Backup

Studiesteder

  • Nederland
    • Flevoland
      • Almere Stad, Flevoland, Nederland, 1315 RA
    • Gelderland
      • Arnhem, Gelderland, Nederland, 6815 AD
      • Nijmegen, Gelderland, Nederland, 6525 GA
        • Rekruttering
        • Radboud university Medical center Nijmegen
        • Ta kontakt med:
        • Ta kontakt med:
    • North Brabant
      • 's-Hertogenbosch, North Brabant, Nederland, 5223 GZ
        • Rekruttering
        • Jeroen Bosch Ziekenhuis
        • Ta kontakt med:
    • North Holland
      • Amsterdam, North Holland, Nederland, 1081 HV
        • Rekruttering
        • Amsterdam UMC, location VUmc
        • Ta kontakt med:
      • Hoofddorp, North Holland, Nederland, 2134 TM
    • Provincie Groningen
      • Groningen, Provincie Groningen, Nederland, 9713 GZ
        • Rekruttering
        • University Medical Center Groningen
        • Ta kontakt med:
      • Groningen, Provincie Groningen, Nederland, 9728 NT
        • Rekruttering
        • Martini Hospital Groningen
        • Ta kontakt med:
    • South Holland
      • Gouda, South Holland, Nederland, 2803 HH
        • Rekruttering
        • Groene Hart Hospital
        • Ta kontakt med:
      • Leiden, South Holland, Nederland, 2333 ZA
        • Rekruttering
        • Leiden University Medical Center
        • Ta kontakt med:
      • Rotterdam, South Holland, Nederland, 3015 GD
      • The Hague, South Holland, Nederland, 2512 VA
    • Utrecht
      • Utrecht, Utrecht, Nederland, 3584 CX
        • Rekruttering
        • University Medical Center Utrecht
        • Ta kontakt med:
        • Ta kontakt med:

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år og eldre (Voksen, Eldre voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Beskrivelse

Inclusion criteria:

In order to be eligible to participate in this study, a subject must meet all of the following criteria:

  • Patients with advanced cancer (≥18 years);
  • Starting with slow release or transdermal opioids for pain;
  • Able to complete a Dutch questionnaire. Previous treatment with opioids is allowed, if discontinued more than 4 weeks ago.

Exclusion Criteria:

A potential subject who meets any of the following criteria will be excluded from participation in this study:

  • Patients with contra-indications for laxatives
  • Maintenance treatment with laxatives during the last 14 days
  • Severely impaired renal function (serum creatinine >180 umol/l)
  • Estimated life expectancy <1 month

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Forebygging
  • Tildeling: Randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Aktiv komparator: Macrogol/electrolytes

Macrogol/electrolytes is started at a dose of 1 sachet once a day orally, based on the current guideline 'Diagnosis and treatment of pain in patients with cancer' (www.pallialine.nl). The dose of macrogol/electrolytes may be increased to 2 sachets a day during the study period.

The effect of laxatives will be judged after 14 days.
Legemiddel: Macrogol Only Product in Oral Dose Form

Information already included in arm/group description.

Andre navn:
  • Makrogol/elektrolytter
Aktiv komparator: Magnesium hydroxide

Magnesium hydroxide is started at a dose of 724 mg three times a day orally, based on the current guideline 'Diagnosis and treatment of pain in patients with cancer' (www.pallialine.nl). The dose of magnesium hydroxide may be increased to 1448 mg three times a day during the study period. The effect of laxatives will be judged after 14 days.
Legemiddel: Magnesium hydroxide 724mg

Information already included in arm/group description.

Andre navn:
  • Magnesiumoksid

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
The percentage of patients with a score of <30 of the Bowel Function Index
Tidsramme: On day 14

A clinician-administered patient-reported questionnaire to assess clinically significant constipation, validated in patients receiving opioids for chronic non-malignant pain and for malignant pain (Abramovitz 2013, Rentz 2009 and 2011). It consists of three questions, assessing ease of defecation, feeling of incomplete bowel evacuation and personal judgement of the patient regarding constipation, each during the last 7 days and each rated on a scale of 0 (best possible outcome) to 100 (worst possible outcome). A total score ≥30 (mean of the three separate scores) indicates clinically significant constipation. A change of the total score of >12 is regarded as clinically meaningful. It has been used in a large observational study in cancer patients receiving opioids (Davies 2021) and in randomised trials of opioid antagonists for OIC (Ahmedzai 2012, Dupoiron 2017, Leng 2020, Poelaert 2015). It has been recommended as the assessment tool of choice for OIC (Argoff 2015, Farmer 2019).
On day 14

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
The EQ5D
Tidsramme: On day 0 and day 14

A self-administered, generic assessment tool developed by the EuroQol Group, a network of international research teams, and consists of questions on five dimensions of health (i.e., mobility, self-care, pain/discomfort, usual activities, and anxiety/depression) (Pickard 2007). It has been used in cost-effectiveness studies on OIC (Dunlop 2012, Hjalte 2016, Lawson 2016).
On day 0 and day 14
Rome IV criteria for opioid-induced constipation
Tidsramme: On day 0 and day 14

Rome IV criteria for opioid-induced constipation as judged by professional care givers (Davies 2021, Drossman 2016), including:

  • straining during >25% of defecations
  • lumpy or hard stools in >25% of defecations
  • sensation of incomplete evacuation in >25% of defecations
  • sensation of anorectal obstruction/blockage in >25% of defecations
  • manual manoeuvres to facilitate >25% of defecations
  • <3 spontaneous defecations per week At least two of these criteria have to be fulfilled in order to diagnose constipation, to be judged by the treating physician or clinical nurse specialists/nurse practitioners
On day 0 and day 14
Cancer pain score
Tidsramme: On day 0 and day 14

Numeric Rating SDcale, ranging from 0 to 10
On day 0 and day 14
Patient satisfaction with laxative
Tidsramme: On day 14

A single four-item question, ranging from unsatisfied to very satisfied.
On day 14
Side effects of laxatives
Tidsramme: On day 14

All side-effects are scored on a four-point Likert scale (not at all, a bit, rather, very much):

  • Bad taste
  • Problems with swallowing
  • Abdominal cramps
  • Nausea
  • Flatulence
  • Diarrhea
  • Other (to be specified by the patient)
On day 14
Cost-effectiveness of macrogol/electrolytes compared to magnesium hydroxide
Tidsramme: On day 14

We aim to perform a comparative cost-effectiveness of the laxatives. This requires data collection on healthcare procedures and QOL in responders, non-responders and patients with side-effects of laxatives for the follow-up period of the study. These healthcare procedures will be extracted from hospital databases and healthcare use outside the hospital will be collected with the iMCQ at 4 weeks. All individual health care procedures will be linked to their unit costs. Reimbursement prices issued by the Dutch Healthcare Authority and national reference prices will be used for this assessment as outlined in current Dutch pharmaco-economic guidance. The cost-effectiveness analysis will be performed using a decision tree including different branches for initial therapy and responders and non-responders. The costs and QOL of the patients in the trial will be used as input for this decision tree. Total costs and effects will be calculated by summing the costs and effects of each branch.
On day 14

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Amsterdam UMC, location VUmc

Samarbeidspartnere

Radboud University Medical Center
University Medical Center Groningen
UMC Utrecht
Erasmus Medical Center
Leiden University Medical Center
Rijnstate Hospital
Groene Hart Ziekenhuis
Flevoziekenhuis
Spaarne Gasthuis
Jeroen Bosch Ziekenhuis
Isala
Martini Hospital Groningen
Bernhoven Hospital
Haaglanden Medical Centre
Antoni van Leeuwenhoek Hospital

Etterforskere

  • Hovedetterforsker: Lia van Zuylen, Prof.dr., Amsterdam UMC, location VUmc

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Generelle publikasjoner

Hjelpsomme linker

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

2. desember 2022

Primær fullføring (Antatt)

1. januar 2027

Studiet fullført (Antatt)

1. juni 2027

Datoer for studieregistrering

Først innsendt

19. januar 2022

Først innsendt som oppfylte QC-kriteriene

19. januar 2022

Først lagt ut (Faktiske)

31. januar 2022

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

5. oktober 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

30. september 2026

Sist bekreftet

1. september 2026

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 08440012010002

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

JA

IPD-planbeskrivelse

Due to the sensitivity of the data, the underlying data sets will not be shared publicly but will be made available for verification/ inspection purposes. Additional sharing conditions will be considered (e.g. via the Personal Health Train initiative from Health-RI, which is currently under development) while respecting the type of informed consent provided by the subjects and discussed with the support of Legal/Privacy/RDM experts where appropriate. For descriptive documentation (protocol, data dictionary, syntax/script, etc.) the study team will collaborate with RDM, to ensure such data can be found and made available to other researchers. Providing information in an online (metadata) catalogue that is certified holds preference.

We are considering using a DANS repository or similar. DANS EASY is commonly used, uses the Dublin Core Metadata standard, provides a PID and holds a Core Trust Seal. However, DANS is initiatiating Data Stations, with a specific one for the Life Sciences and

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

produkt produsert i og eksportert fra USA

Nei

Denne informasjonen ble hentet direkte fra nettstedet clinicaltrials.gov uten noen endringer. Hvis du har noen forespørsler om å endre, fjerne eller oppdatere studiedetaljene dine, vennligst kontakt register@clinicaltrials.gov. Så snart en endring er implementert på clinicaltrials.gov, vil denne også bli oppdatert automatisk på nettstedet vårt. .

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