Pneumocystis PneumoniaDDBIOSNCT06431958
Droplet Digital PCR and PCR-free BIOSensors for the Detection of Resistance-associated SNPs in Pneumocystis Jirovecii
An observational study of Pneumocystis Pneumonia, run by University Hospital, Brest at 1 site in France.
Trial summary
The main objective of the proposed research is to identify Pneumocystis jirovecii mutant strains on 4 genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) and therefore to assess the prevalence of… Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Pneumocystis Pneumonia
- How many people
- 300 participants
- Where
- 1 siteFrance
- Study dates
- 1 Jun 2024to 31 Dec 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
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 Any age
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Study population: Patients in whom P. jirovecii was detected in a pulmonary sample (bronchoalveolar lavage, sputum, bronchial aspiration, oropharyngeal rinse, nasopharyngeal sample) can be included in the study
Who may be able to join
- Patients in whom P. jirovecii was detected in a pulmonary sample (bronchoalveolar lavage, sputum, bronchial aspiration, oropharyngeal rinse, nasopharyngeal sample)
- No opposition
- Patient affiliated to a social security system
Who cannot join
- Patients under legal protection (guardianship, curatorship)
- Refusal to participate
Trial locations and contacts
1 site in 1 country.
About this study
The main objective of the proposed research is to identify Pneumocystis jirovecii mutant strains on 4 genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) and therefore to assess the prevalence of potentially resistant strains in patients infected with P. jirovecii.
Read the detailed description
Pneumocystis jirovecii (P. jirovecii) is an opportunistic pathogenic fungus responsible for pulmonary infection or Pneumocystis pneumonia (PCP) in immunocompromised patients. There is currently no system for its in vitro culture. The diagnostic methods used are mainly based on molecular biology techniques which also allow the detection and analysis of single nucleotide polymorphisms (SNPs), particularly at the level of genes coding for the targets of molecules widely used in the prevention and treatment of PCP. These SNPs may represent missense mutations potentially associated with treatment resistance. They may result from exposure of patients to these treatments before the development of P. jirovecii infection. However, data concerning the prevalence of these mutations remains scarce, particularly in France. Methods for detecting these mutations based on PCR followed by DNA sequencing have limitations in terms of sensitivity. The evaluation of new, more sensitive and rapid tools for the detection and characterization of pathogens in this context is necessary.
The main objective of the proposed research is to identify P. jirovecii mutant strains on 4 genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) and therefore to assess the prevalence of potentially resistant strains in patients infected with P. jirovecii.
The secondary objectives are:
- to determine the factors associated (e.g. exposure to treatments) with mutant P. jirovecii strains
- to determine the impact of mutations on the effectiveness of anti-Pneumocystis treatment (e.g. favorable vs. unfavorable evolution of the infection)
- to evaluate two methods - digital droplet PCR and biosensors without PCR - for the detection and characterization of mutations associated with resistance in Pneumocystis jirovecii
- Conditions
- Pneumocystis Pneumonia
- Keywords
- Pneumocystis jirovecii, mutant, anti-microbial resistance, DHPS, DHFR, Cytochrome b, IMPDH
- Medical subject headings
- Pneumonia, Pneumocystis
What is being measured
The primary outcome is the main question the study is designed to answer.
Presence of specific strains of Pneumocystis jirovecii potentially resistant to treatments in patients infected with this fungus
Four genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) will be amplified and sequenced to detect single nucleotide polymorphisms (Single Nucleotide Polymorphism, SNP), in particular those potentially linked to resistance to anti-Pneumocystis treatments.
Measured: at inclusion
Secondary outcomes (1)
to determine the factors associated (e.g. exposure to treatments) with P. jirovecii mutant strains
Measured: at inclusion
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted29 May 2024
- Study start1 Jun 2024
- Primary completion31 Dec 2026 (estimated)
- Study completion31 Dec 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (7)Papers the sponsor has linked to this study.
- Other trials for Pneumocystis PneumoniaStudies of the same condition, open and under way.
- More trials run by University Hospital, BrestThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Retrospective
- Enrolment
- 300 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University Hospital, Brest
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06431958
- Sponsor's protocol ID
- 29BRC24.0085 - DDBIOS
- Acronym
- DDBIOS
- Status last verified
- Apr 2024
- First submitted
- 22 May 2024
- Last updated
- 9 Aug 2024
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: All collected data that underlie results in a publication
Publications
Hoffmann CV, Nevez G, Moal MC, Quinio D, Le Nan N, Papon N, Bouchara JP, Le Meur Y, Le Gal S. Selection of Pneumocystis jirovecii Inosine 5'-Monophosphate Dehydrogenase Mutants in Solid Organ Transplant Recipients: Implication of Mycophenolic Acid. J Fungi (Basel). 2021 Oct 10;7(10):849. doi: 10.3390/jof7100849.
PubMed 34682270Argy N, Le Gal S, Coppee R, Song Z, Vindrios W, Massias L, Kao WC, Hunte C, Yazdanpanah Y, Lucet JC, Houze S, Clain J, Nevez G. Pneumocystis Cytochrome b Mutants Associated With Atovaquone Prophylaxis Failure as the Cause of Pneumocystis Infection Outbreak Among Heart Transplant Recipients. Clin Infect Dis. 2018 Aug 31;67(6):913-919. doi: 10.1093/cid/ciy154.
PubMed 29514207Bonnet PL, Hoffmann CV, Le Nan N, Bellamy L, Hoarau G, Flori P, Demar M, Argy N, Morio F, Le Gal S, Nevez G. Atovaquone exposure and Pneumocystis jirovecii cytochrome b mutations: French data and review of the literature. Med Mycol. 2023 Sep 4;61(9):myad095. doi: 10.1093/mmy/myad095.
PubMed 37656874de la Horra C, Friaza V, Morilla R, Delgado J, Medrano FJ, Miller RF, de Armas Y, Calderon EJ. Update on Dihydropteroate Synthase (DHPS) Mutations in Pneumocystis jirovecii. J Fungi (Basel). 2021 Oct 13;7(10):856. doi: 10.3390/jof7100856.
PubMed 34682277Nahimana A, Rabodonirina M, Bille J, Francioli P, Hauser PM. Mutations of Pneumocystis jirovecii dihydrofolate reductase associated with failure of prophylaxis. Antimicrob Agents Chemother. 2004 Nov;48(11):4301-5. doi: 10.1128/AAC.48.11.4301-4305.2004.
PubMed 15504856Kojabad AA, Farzanehpour M, Galeh HEG, Dorostkar R, Jafarpour A, Bolandian M, Nodooshan MM. Droplet digital PCR of viral DNA/RNA, current progress, challenges, and future perspectives. J Med Virol. 2021 Jul;93(7):4182-4197. doi: 10.1002/jmv.26846. Epub 2021 Mar 11.
PubMed 33538349Pla L, Avino A, Eritja R, Ruiz-Gaitan A, Peman J, Friaza V, Calderon EJ, Aznar E, Martinez-Manez R, Santiago-Felipe S. Triplex Hybridization-Based Nanosystem for the Rapid Screening of Pneumocystis Pneumonia in Clinical Samples. J Fungi (Basel). 2020 Nov 17;6(4):292. doi: 10.3390/jof6040292.
PubMed 33213011
Study at a glance
From the registry record, last updated by the sponsor on 9 Aug 2024. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Droplet Digital PCR and PCR-free BIOSensors for the Detection of Resistance-associated SNPs in Pneumocystis Jirovecii
- ClinicalTrials.gov ID
- NCT06431958
- Acronym / sponsor ID
- DDBIOS / 29BRC24.0085 - DDBIOS
- Conditions
- Pneumocystis Pneumonia
- Keywords
- Pneumocystis jirovecii, mutant, anti-microbial resistance, DHPS, DHFR, Cytochrome b, IMPDH
- Study type
- Observational
- Recruitment status
- Active, not recruiting
- Enrolment
- 300 participants (estimated)
- Lead sponsor
- University Hospital, BrestUniversity, hospital or other
- Study start
- 1 Jun 2024 (actual)
- Primary completion
- 31 Dec 2026 (estimated)
- Study completion
- 31 Dec 2026 (estimated)
- First posted
- 29 May 2024 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The main objective of the proposed research is to identify Pneumocystis jirovecii mutant strains on 4 genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) and therefore to assess the prevalence of potentially resistant strains in patients infected with P. jirovecii.
Detailed description
Pneumocystis jirovecii (P. jirovecii) is an opportunistic pathogenic fungus responsible for pulmonary infection or Pneumocystis pneumonia (PCP) in immunocompromised patients. There is currently no system for its in vitro culture. The diagnostic methods used are mainly based on molecular biology techniques which also allow the detection and analysis of single nucleotide polymorphisms (SNPs), particularly at the level of genes coding for the targets of molecules widely used in the prevention and treatment of PCP. These SNPs may represent missense mutations potentially associated with treatment resistance. They may result from exposure of patients to these treatments before the development of P. jirovecii infection. However, data concerning the prevalence of these mutations remains scarce, particularly in France. Methods for detecting these mutations based on PCR followed by DNA sequencing have limitations in terms of sensitivity. The evaluation of new, more sensitive and rapid tools for the detection and characterization of pathogens in this context is necessary.
The main objective of the proposed research is to identify P. jirovecii mutant strains on 4 genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) and therefore to assess the prevalence of potentially resistant strains in patients infected with P. jirovecii.
The secondary objectives are:
- to determine the factors associated (e.g. exposure to treatments) with mutant P. jirovecii strains
- to determine the impact of mutations on the effectiveness of anti-Pneumocystis treatment (e.g. favorable vs. unfavorable evolution of the infection)
- to evaluate two methods - digital droplet PCR and biosensors without PCR - for the detection and characterization of mutations associated with resistance in Pneumocystis jirovecii
Study design
- Observational model
- Case only
- Time perspective
- Retrospective
Who may qualify
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
- Study population
- Patients in whom P. jirovecii was detected in a pulmonary sample (bronchoalveolar lavage, sputum, bronchial aspiration, oropharyngeal rinse, nasopharyngeal sample) can be included in the study
Key inclusion criteria (3 listed)
- Patients in whom P. jirovecii was detected in a pulmonary sample (bronchoalveolar lavage, sputum, bronchial aspiration, oropharyngeal rinse, nasopharyngeal sample)
- No opposition
- Patient affiliated to a social security system
Key exclusion criteria (2 listed)
- Patients under legal protection (guardianship, curatorship)
- Refusal to participate
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Presence of specific strains of Pneumocystis jirovecii potentially resistant to treatments in patients infected with this fungus
Time frame: at inclusion
Four genes encoding therapeutic targets such as dihydropteroate synthase (DHPS), dihydrofolate reductase (DHFR), cytochrome b (CYB), inosine-5'-monophosphate dehydrogenase (IMPDH) will be amplified and sequenced to detect single nucleotide polymorphisms (Single Nucleotide Polymorphism, SNP), in particular those potentially linked to resistance to anti-Pneumocystis treatments.
1 secondary outcome
to determine the factors associated (e.g. exposure to treatments) with P. jirovecii mutant strains
Time frame: at inclusion
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 9 Aug 2024.
- Results publication: PubMed 34682270Hoffmann CV, Nevez G, Moal MC, Quinio D, Le Nan N, Papon N, Bouchara JP, Le Meur Y, Le Gal S. Selection of Pneumocystis jirovecii Inosine 5'-Monophosphate Dehydrogenase Mutants in Solid Organ Transplant Recipients: Implication of Mycophenolic Acid. J Fungi (Basel). 2021 Oct 10;7(10):849. doi: 10.3390/jof7100849.
- Results publication: PubMed 29514207Argy N, Le Gal S, Coppee R, Song Z, Vindrios W, Massias L, Kao WC, Hunte C, Yazdanpanah Y, Lucet JC, Houze S, Clain J, Nevez G. Pneumocystis Cytochrome b Mutants Associated With Atovaquone Prophylaxis Failure as the Cause of Pneumocystis Infection Outbreak Among Heart Transplant Recipients. Clin Infect Dis. 2018 Aug 31;67(6):913-919. doi: 10.1093/cid/ciy154.
- Results publication: PubMed 37656874Bonnet PL, Hoffmann CV, Le Nan N, Bellamy L, Hoarau G, Flori P, Demar M, Argy N, Morio F, Le Gal S, Nevez G. Atovaquone exposure and Pneumocystis jirovecii cytochrome b mutations: French data and review of the literature. Med Mycol. 2023 Sep 4;61(9):myad095. doi: 10.1093/mmy/myad095.
- Results publication: PubMed 34682277de la Horra C, Friaza V, Morilla R, Delgado J, Medrano FJ, Miller RF, de Armas Y, Calderon EJ. Update on Dihydropteroate Synthase (DHPS) Mutations in Pneumocystis jirovecii. J Fungi (Basel). 2021 Oct 13;7(10):856. doi: 10.3390/jof7100856.
- Results publication: PubMed 15504856Nahimana A, Rabodonirina M, Bille J, Francioli P, Hauser PM. Mutations of Pneumocystis jirovecii dihydrofolate reductase associated with failure of prophylaxis. Antimicrob Agents Chemother. 2004 Nov;48(11):4301-5. doi: 10.1128/AAC.48.11.4301-4305.2004.
- Results publication: PubMed 33538349Kojabad AA, Farzanehpour M, Galeh HEG, Dorostkar R, Jafarpour A, Bolandian M, Nodooshan MM. Droplet digital PCR of viral DNA/RNA, current progress, challenges, and future perspectives. J Med Virol. 2021 Jul;93(7):4182-4197. doi: 10.1002/jmv.26846. Epub 2021 Mar 11.
- Results publication: PubMed 33213011Pla L, Avino A, Eritja R, Ruiz-Gaitan A, Peman J, Friaza V, Calderon EJ, Aznar E, Martinez-Manez R, Santiago-Felipe S. Triplex Hybridization-Based Nanosystem for the Rapid Screening of Pneumocystis Pneumonia in Clinical Samples. J Fungi (Basel). 2020 Nov 17;6(4):292. doi: 10.3390/jof6040292.
- Individual participant dataSharing planned: Yes. All collected data that underlie results in a publication
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Pneumocystis Pneumonia, run by University Hospital, Brest at 1 site in France.
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 3 inclusion and 2 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: under way, not looking for participants, as of the sponsor's last update on 9 Aug 2024. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in France. 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.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
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?
Presence of specific strains of Pneumocystis jirovecii potentially resistant to treatments in patients infected with this fungus (time frame: at inclusion). 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 NCT06431958, which also lists 7 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 9 Aug 2024.