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    Clinical Trial Results:
    A phase IV, prospective, randomised single-blind UK multicentre non-inferiority trial of low-dose versus standard dose rituximab for prevention of relapses in acquired TTP

    Summary
    EudraCT number
    2017-001117-86
    Trial protocol
    GB  
    Global end of trial date
    31 Jan 2025

    Results information
    Results version number
    v1(current)
    This version publication date
    10 Apr 2026
    First version publication date
    10 Apr 2026
    Other versions
    Summary report(s)
    ERTTP final stats report v1.4

    Trial information

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    Trial identification
    Sponsor protocol code
    16/0340
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    -
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    University College London
    Sponsor organisation address
    Gower Street, London, United Kingdom,
    Public contact
    Joint Research Office, University College London, ctimps@ucl.ac.uk
    Scientific contact
    Joint Research Office, University College London, ctimps@ucl.ac.uk
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    No
    Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Results analysis stage
    Analysis stage
    Final
    Date of interim/final analysis
    18 Feb 2026
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    31 Jan 2025
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    We know that a fall in ADAMTS13 activity in remission can be a sign of upcoming TTP relapse. We plan to see if low dose rituximab is as effective as the standard dose in preventing TTP relapse by looking at the length of time until patients need to be treated again with ritiuximab or other immunosuppression
    Protection of trial subjects
    Annual data monitoring and safety committee
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    03 Jul 2017
    Long term follow-up planned
    No
    Independent data monitoring committee (IDMC) involvement?
    Yes
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    United Kingdom: 70
    Worldwide total number of subjects
    70
    EEA total number of subjects
    0
    Number of subjects enrolled per age group
    In utero
    0
    Preterm newborn - gestational age < 37 wk
    0
    Newborns (0-27 days)
    0
    Infants and toddlers (28 days-23 months)
    0
    Children (2-11 years)
    0
    Adolescents (12-17 years)
    0
    Adults (18-64 years)
    59
    From 65 to 84 years
    11
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    70 patients randomised , 35 in each study arm

    Pre-assignment
    Screening details
    163 patients potentially eligible

    Period 1
    Period 1 title
    Overall trial (overall period)
    Is this the baseline period?
    Yes
    Allocation method
    Randomised - controlled
    Blinding used
    Single blind
    Roles blinded
    Subject

    Arms
    Are arms mutually exclusive
    Yes

    Arm title
    Standard dose rituximab
    Arm description
    375mg/m2 x4 doses weekly
    Arm type
    Active comparator

    Investigational medicinal product name
    Rituximab
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Solution for infusion
    Routes of administration
    Intravenous use
    Dosage and administration details
    375mg/m2 iv weekly for 4 weeks

    Arm title
    Low dose rituximab
    Arm description
    RTX 200mg iv weekly x 4
    Arm type
    Experimental

    Investigational medicinal product name
    Rituximab
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Solution for infusion
    Routes of administration
    Intravenous use
    Dosage and administration details
    200mg flat dose iv weekly for 4 weeks

    Number of subjects in period 1
    Standard dose rituximab Low dose rituximab
    Started
    35
    35
    Completed
    28
    24
    Not completed
    7
    11
         sponsor decision
    -
    1
         Physician decision
    3
    1
         clinical relapse (2 during treatment period)
    -
    4
         death
    1
    1
         Adverse event, non-fatal
    -
    3
         .
    2
    -
         Lost to follow-up
    1
    -
         Protocol deviation
    -
    1

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Standard dose rituximab
    Reporting group description
    375mg/m2 x4 doses weekly

    Reporting group title
    Low dose rituximab
    Reporting group description
    RTX 200mg iv weekly x 4

    Reporting group values
    Standard dose rituximab Low dose rituximab Total
    Number of subjects
    35 35 70
    Age categorical
    Units: Subjects
        In utero
    0
        Preterm newborn infants (gestational age < 37 wks)
    0
        Newborns (0-27 days)
    0
        Infants and toddlers (28 days-23 months)
    0
        Children (2-11 years)
    0
        Adolescents (12-17 years)
    0
        Adults (18-64 years)
    0
        From 65-84 years
    0
        85 years and over
    0
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    51.0 ( 14.3 ) 49.7 ( 15.4 ) -
    Gender categorical
    Units: Subjects
        Female
    25 25 50
        Male
    10 10 20

    End points

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    End points reporting groups
    Reporting group title
    Standard dose rituximab
    Reporting group description
    375mg/m2 x4 doses weekly

    Reporting group title
    Low dose rituximab
    Reporting group description
    RTX 200mg iv weekly x 4

    Primary: Time to retreatment (days) with rituximab or other immunosuppression

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    End point title
    Time to retreatment (days) with rituximab or other immunosuppression
    End point description
    End point type
    Primary
    End point timeframe
    From Day 1 of first rituximab infusion to D1 of any subsequent course of elective rituximab
    End point values
    Standard dose rituximab Low dose rituximab
    Number of subjects analysed
    31
    28
    Units: Hazard ratio
        median (confidence interval 90%)
    20.1 (17.2 to 24.4)
    19.7 (15.5 to 27.2)
    Statistical analysis title
    Primary outcome
    Statistical analysis description
    primary outcome is time to retreatment with rituximab/other immunosuppression measured in days from day of first rituximab infusion (D1) until D1 of any subsequent course of elective rituximab, or introduction of other immunosuppression initiated with the aim of preventing clinical relapse of TTP after having achieved normalisation of ADAMTS13 or return to patient’s normal baseline. This is analysed as a time-to-event variable.
    Comparison groups
    Low dose rituximab v Standard dose rituximab
    Number of subjects included in analysis
    59
    Analysis specification
    Pre-specified
    Analysis type
    non-inferiority
    P-value
    = 0.799
    Method
    Logrank
    Parameter type
    Hazard ratio (HR)
    Point estimate
    0.93
    Confidence interval
         level
    90%
         sides
    2-sided
         lower limit
    0.56
         upper limit
    1.53

    Adverse events

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    Adverse events information [1]
    Timeframe for reporting adverse events
    AEs collected from the time of signing of the informed consent and throughout the study period including the follow-up period.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    24.0
    Reporting groups
    Reporting group title
    Whole trial
    Reporting group description
    -

    Notes
    [1] - There are no non-serious adverse events recorded for these results. It is expected that there will be at least one non-serious adverse event reported.
    Justification: All AEs reported and listed in supplementary information of publication Infusion-related adverse effects or other rituximab-related adverse effects reported as pre-specified secondary outcomes
    Serious adverse events
    Whole trial
    Total subjects affected by serious adverse events
         subjects affected / exposed
    14 / 70 (20.00%)
         number of deaths (all causes)
    2
         number of deaths resulting from adverse events
    2
    Vascular disorders
    Pulmonary embolism
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Cardiac disorders
    Acute myocardial infarction
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Arteriosclerosis coronary artery
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 1
    Chest pain
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Coronary artery thrombosis
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 1
    Nervous system disorders
    Ischaemic stroke
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Blood and lymphatic system disorders
    Sickle cell anaemia with crisis
         subjects affected / exposed
    2 / 70 (2.86%)
         occurrences causally related to treatment / all
    0 / 3
         deaths causally related to treatment / all
    0 / 0
    Immune system disorders
    Serum sickness
         subjects affected / exposed
    4 / 70 (5.71%)
         occurrences causally related to treatment / all
    4 / 4
         deaths causally related to treatment / all
    0 / 0
    Autoimmune haemolytic anaemia
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    1 / 1
         deaths causally related to treatment / all
    0 / 0
    Respiratory, thoracic and mediastinal disorders
    Dyspnoea
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Infections and infestations
    Cellulitis
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    COVID-19
         subjects affected / exposed
    2 / 70 (2.86%)
         occurrences causally related to treatment / all
    1 / 2
         deaths causally related to treatment / all
    0 / 1
    Febrile infection
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Influenza
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Lower Respiratory Tract infection
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Upper respiratory tract Infection
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    1 / 1
         deaths causally related to treatment / all
    0 / 0
    Urinary Tract Infection
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Viral infection
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Metabolism and nutrition disorders
    Hyperkalaemia
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Hyponatraemia
         subjects affected / exposed
    1 / 70 (1.43%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Whole trial
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    0 / 70 (0.00%)

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    15 May 2018
    Protocol version 1.2 Substantial amendments including addition of sites, change of PIs, change of conduct of trial
    15 Apr 2020
    Protocol version 1.4 Substantial amendments: 1) Change of inclusion criteria to include patients with platelets at usual baseline where another cause of thrombocytopenia exists AND platelets 100-150) 2) Sub-investigators update 3) Protocol versions 4) Updated version of SAE reporting flowchart 5) Timing of randomisation 6) Individual sites can randomise 7) The same blood tests may be used for screening and D1 visit if they occur on the same day 8) ADAMTS13 activity result performed within 7 days before randomisation may be used for screening (standard of care ADAMTS13 result from up to 7 days before screening visit may be used) 9) Virology (HIV, hepatitis B, hepatitis C) results performed within 7 days before randomisation may be used for screening (standard of care results from up to 7 days before screening visit may be used) 10) CD19 count, immunoglobulins, ADAMTS13 activity/antibodies removed from D1 bloods 11) No requirement for temperature checks at follow up visit 12) Urea removed from trial biochemistry 13) Clarification of the procedure for when an existing participant is re-randomised into the study. 14) Clarification of vital signs to be taken on visits 3,4&5 15) Update on information required to be included on patient samples. 16) Administrative updates to email addresses etc. 17) Minor changes/ clarifications to statistical plan
    03 Jun 2021
    Protocol version 1.5 Substantial amendments: 1. Administrative updates and changes to contact details. 2. Increase recruitment target to 64 to account for withdrawals/loss to follow up (e.g. due to pregnancy, death etc.) and updated Figures 2 & 3 to reflect this 3. Clarification of the evaluable/analysis population 4. Increase recruitment period from 36 months to 51 months and total trial duration from 60 months to 75 months and updated Figure 1 to reflect this 5. Clarification of primary and secondary outcomes with more precise wording. 6. Guidance on the timing of COVID vaccination in relation to rituximab administration

    Interruptions (globally)

    Were there any global interruptions to the trial? No

    Limitations and caveats

    Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data.
    None reported
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