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Enrolling by Invitation

NCT Number: NCT07172191

Fecal Microbiota Transplantation Among Adult Patients With Hematological Malignancies

In Hungary - in comparison to other member states of the European Union - about 75000 new cases of cancer are diagnosed annually, from which approximately 4500-5000 patients suffer from so-called malignant hematological diseases. This disease group includes various leukemias (blood cancers) and lymphomas (lymph node cancers). Chemotherapy for patients with malignant hematological diseases is particularly difficult to bear, as it affects the entire body, including the "good" gut bacteria living inside, and recovery can take several years. Due to the decrease of the "good" gut bacteria during treatment, patients are more prone to acquiring various difficult-to-treat infections, which can lead to deterioration of quality of life, prolonged hospitalization, and in the worst cases, death. The method outlined in this research plan is called fecal microbiota transplantation, during which stool from a healthy person is introduced into the body of the sick patient. The "good" gut bacteria present in the stool then restore the patient's entire gut flora (the process is somewhat similar to the use of probiotics available on the market, but it is a much more effective method). This research aims to assess the success of fecal microbiota transplantation in adults with malignant hematological diseases over a long-term follow-up period, thus contributing to the restoration of their acceptable quality of life.

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Key information

Conditions

Malignant Hematologic Neoplasm Hematologic Diseases Hematologic Neoplasms Hemic and Lymphatic Diseases Neoplasms Neoplasms by Site

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

South Pest Central Hospital, National Institute of Hematology and Infectious Diseases

Budapest, H-1097, Hungary

About this study

Fecal microbiota transplantation (FMT) is currently a widely accepted method of manipulating enteric microbiome, and is an internationally recommended procedure in the treatment for Clostridioides (formerly Clostridium) difficile (C. difficile) infection. The goal of FMT is to restore physiological gut microbiome through natural competition, by administering a stool graft harvested from a healthy person. FMT not only eliminates C. difficile-induced colitis, but also colonization of multidrug-resistant bacterial/fungal species, and certain types of intestinal epithelial damage occuring in some medical conditions. In recent years due to pleiotropic effects of FMT, scientific interest has turned towards adult patients with malignant hematological diseases, since all of the pathological conditions mentioned earlier occur during clinical care in this population, due to detrimental effects of immuno-chemotherapy. Based on promising preliminary results, FMT could be a successful, easily implementable intervention for these patients in the future.

Therefore, the aim of this study is to perform FMTs in four indication groups among adult patients with malignant hematological diseases treated at South Pest Central Hospital - National Institute of Hematology and Infectious Diseases (Budapest, Hungary), followed by a 180-day follow-up period, during which standardized clinical, laboratory, imaging, and microbiological data are collected. In addition, a high-resolution microbiome analys to monitor microbiological changes of recipient pre-/post-FMT blood and stool samples is planned, in collaboration with Departmental Group of Infectious Diseases and Institute of Medical Microbiology of Semmelweis University (Budapest, Hungary).

This study aims to assess both the bacterial and fungal components of the enteric microbiome in adult patients receiving routine clinical care for malignant hematological diseases, and to explore the potential of manipulating the microbiome through fecal microbiota transplantation (FMT). The hypothesis is that microbiome manipulation with FMT in these patients may induce a successful and sustained response by restoring the physiological intestinal microbiome, a premise that this long-term, comprehensive clinical and microbiological follow-up study seeks to support.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adult patients (diagnosis age ≥18 years) with malignant hematological disease treated at our center, and
  • Capable of giving written informed consent after decision-making, and
  • Documented patient colonization with MDR bacterial or fungal isolates, or
  • Active C. difficile infection, or
  • Patient has undergone autologous or allogeneic hematopoietic stem cell transplantation, or
  • Ongoing corticosteroid-refractory acute gastrointestinal GvHD.

Exclusion criteria

(one or more must be met):

  • Active bacterial or fungal bloodstream infection requiring antimicrobial therapy, or
  • Peripheral blood absolute neutrophil count <0.5 G/l on ≥7 consecutive days before planned FMT with maximum dose of administered G-CSF, or
  • Pressor-refractory septic shock, or
  • Major gastrointestinal bleeding within 7 consecutive days before planned FMT, or
  • Any pathological process inhibiting successful or safe nasogastric tube insertion, or
  • Lack of written informed consent.

Treatment and study plan

Fecal Microbial Transplantation

Biological

The technical implementation of FMT procedure is consistent with the methodological letter issued by the National Public Health Center of Hungary. FMT is performed via nasogastric tube with suspended fresh stool graft or fecal filtrate, or lyophilised stool capsules, obtained and prepared from a pre-selected stool donor. Following FMT, the patient is observed for 24 hours at our center. The process is supervised and performed by the lead researcher.

Primary outcomes

  1. Disease activity

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Disease activity: hematological remission vs. relapse, GvHD activity. Disease activity of the malignant hematological underlying disease (hematological remission vs. relapse) is defined according to the published methodological recommendations by the National Comprehensive Cancer Network and the European Hematology Association (or the American Society of Hematology, if neither has specific guidance), specifically for each disease. GvHD activity is defined according to the published methodological recommendations of the European Bone Marrow Transplantation Society.

Secondary outcomes

  1. Reducibility of applied immunosuppressive pharmacotherapy

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Reducibility of applied immunosuppressive pharmacotherapy. The reducibility of immunosuppressive and antimicrobial pharmacotherapy is determined based on the number of active substances and changes in dose intensity.

  2. Reducibility of applied antimicrobial pharmacotherapy

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Reducibility of applied antimicrobial pharmacotherapy. The reducibility of immunosuppressive and antimicrobial pharmacotherapy is determined based on the number of active substances and changes in dose intensity.

  3. Survival

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared controls

    Survival: total and progression-free survival. Total survival: the patient does not die during the follow-up period. Progression-free survival: during the follow-up period, the stage of the malignant hematological underlying disease documented at enrollment does not change or improves (partial or complete hematological remission occurs), and the patient does not die. The activity of the malignant hematological underlying disease is defined according to the published methodological recommendations by the National Comprehensive Cancer Network and the European Hematology Association (or the American Society of Hematology, if neither has specific guidance), specifically for each disease.

  4. Clinical cure of C. difficile infection

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Clinical cure of C. difficile infection: we apply the guidelines of the European Society of Clinical Microbiology and Infectious Diseases to define clinical cure

Other outcomes

  1. Loss of colonization with multidrug-resistant bacterial or fungal isolates

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Loss of colonization with multidrug-resistant bacterial or fungal isolates: Colonization cannot be confirmed by standard microbiological culturing from samples taken from investigated anatomical locations (see earlier). The definitions of multidrug resistance are based on the recommendations of Magiorakos et al. (Clinical Microbiology and Infection, 2012) and Kristóf et al. (Mikrobiológiai Körlevél, 2021 [in Hungarian]).

  2. Loss of C. difficile colonization

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Loss of C. difficile colonization: The presence of C. difficile GDH antigen and "A+B" toxins cannot be confirmed in the regularly stored and transported stool sample of an asymptomatic person. We apply the guidelines of Debast et al. (Clinical Microbiology and Infection, 2014) for detection.

  3. Regeneration of blood and gut microbiome after autologous and allogeneic stem cell transplantation

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Regeneration of blood and gut microbiome after autologous and allogeneic stem cell transplantation: Based on abundance analysis performed by 16S metagenome sequencing of collected blood and stool samples.

  4. Regeneration of blood and gut microbiome during GvHD

    Time frame: On Day 7, Day 30, Day 60 and Day 180, since the intervention, compared to baseline and controls

    Regeneration of blood and gut microbiome during GvHD: Based on abundance analysis performed by 16S metagenome sequencing of collected blood and stool samples.

Sponsors and collaborators

Lead sponsor

Del-Pest Central Hospital - National Institute of Hematology and Infectious Diseases

Other

Registry information

Official study title

Manipulation of the Enteral Microbiome by Fecal Microbiota Transplantation Among Adult Patients With Malignant Hematological Diseases

Acronym: HEMAT-FMT

Important dates

Study start
2025
Primary completion
2028
Study completion
2030
First posted
Sep 15, 2025
Registry last updated
Apr 30, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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