A Safety and Efficacy Study of FCR001 vs Standard of Care in de Novo Living Donor Kidney Transplantation (FREEDOM-1)

• ClinicalTrials.gov Identifier: NCT03995901
• Recruitment Status: Recruiting
• First Posted: June 24, 2019
• Last Update Posted: July 27, 2022
• Sponsor: Talaris Therapeutics Inc.
• Information provided by (Responsible Party): Talaris Therapeutics Inc.

Tracking Information

• First Submitted Date: June 13, 2019
• First Posted Date: June 24, 2019
• Last Update Posted Date: July 27, 2022
• Actual Study Start Date: October 25, 2019
• Estimated Primary Completion Date: April 2023 (Final data collection date for primary outcome measure)

Current Primary Outcome Measures (submitted: July 22, 2022)

Proportion of FCR001 recipients who are free from immunosuppression (IS), without biopsy proven acute rejection (BPAR) at 24 months post-transplant [ Time Frame: 24 months post-transplant ]

Free from IS is defined as not taking any immunosuppression medications and not having to take immunosuppression medications since their withdrawal. Biopsy proven acute rejection is defined as Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018).

Original Primary Outcome Measures (submitted: June 20, 2019)

Proportion of FCR001 recipients who are free from immunosuppression (IS), without biopsy proven acute rejection (BPAR) at 24 months post-transplant [ Time Frame: 24 months post-transplant ]

Free from IS is defined as not taking any immunosuppression medications and not having to take immunosuppression medications since their withdrawal. Biopsy proven acute rejection Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018).

Current Secondary Outcome Measures (submitted: July 22, 2022)

• Change in renal function by Modification of Diet in Renal Disease (MDRD4) from post-transplant baseline (Month 1) to Month 24 in FCR001 recipients [ Time Frame: 24 months post-transplant ]
• Proportion of FCR001 recipients free from IS, without BPAR, at Month 36 and 60 [ Time Frame: Month 36 and 60 post transplant ]
• Allograft function (eGFR by MDRD4) and change in eGFR from Month 1 to Month 24, 36, and Month 60, by treatment [ Time Frame: Month 1 (post-transplant) to Month 24, 36, and Month 60 ]
• Slope and difference in slope of estimated glomerular filtration rate (eGFR) by Modification of Diet in Renal Disease (MDRD4) over time to Month 24, 36, and 60, by treatment [ Time Frame: Month 24, 36, and 60 ]
• Allograft function (eGFR) and change in renal allograft function from Month 1 to Months 24, 36 and 60 by treatment group, using the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula [ Time Frame: Month 1 (post transplant) to Month 24, 36, and Month 60 ]
• Time to the event for the composite of BPAR, graft loss, death or lost to follow-up and for each component, by treatment group [ Time Frame: Month 1 (post transplant) to Month 6, 12, 24, 36, and 60 ]
• Incidence of composite endpoint of BPAR, graft loss or death, by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of composite endpoint of BPAR, graft loss, or death and lost to follow-up, by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of BPAR and treated BPAR by severity, type, and steroid-resistance, by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of acute rejection [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of de novo donor-specific antibodies [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence or worsening of abnormal histologic findings of cellular or antibody-mediated chronic rejection, chronic glomerulopathy, tubular atrophy and interstitial fibrosis, C4d, calcineurin inhibitor induced damage, disease recurrence, BK nephropathy [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of renal replacement therapy by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of BPAR or eGFR <50 mL/min by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Categorical distribution of eGFR according to chronic kidney disease CKD staging classification by treatment [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence and severity of adverse events (AEs; including infections), serious adverse events (SAEs) and AEs leading to study and/or regimen discontinuation [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of BK viremia, viruria, infection, and nephropathy by treatment [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence of the adverse events of special interest (proteinuria, neurotoxicity, anemia, diabetes, hypertension, dyslipidemia, opportunistic infections, major adverse cardiovascular events, and malignancies [ Time Frame: Months 12, 24, 36 and 60 ]
• Urinary protein and albumin excretion, estimated by urinary protein/creatinine and urinary albumin/creatinine ratios by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Subject quality of life according to 36-Item Short Form Health Survey (SF-36) will be analyzed descriptively by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Subject quality of life according to End-Stage Renal Disease Symptom Checklist (ESRD-SCL) will be analyzed descriptively by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
• Incidence and duration of hospitalization and readmission, according to type of ward/unit [ Time Frame: Months 12, 24, 36 and 60 ]
• iBox predicted allograft survival [ Time Frame: Months 12 and 24 post-transplant ]
• Graft and patient survival and eGFR in FCR001 recipients who are only transiently chimeric [ Time Frame: Month 24, 36, and 60 ]
• To describe the incidence and severity of AEs (including infections) and SAEs among FCR001 donors [ Time Frame: Month 24, 36, and 60 ]
• Incidence of acute rejection, death, renal graft loss, and lost to follow-up between FCR001 recipients who did not achieve durable chimerism or the ability to wean or remain off immunosuppression vs. the control arm [ Time Frame: Month 24, 36, and 60 ]
• The incidence of autologous infusions in FCR001 recipients [ Time Frame: Month 6, 12, 24, 36, and 60 ]
• The incidence of engraftment syndrome in FCR001 recipients [ Time Frame: Month 6, 12, 24, 36, and 60 ]
• The incidence of blood component transfusions in FCR001 recipients [ Time Frame: Month 6, 12, 24, 36, and 60 ]
• The time to neutrophil and platelet recovery in FCR001 recipients [ Time Frame: Month 6, 12, 24, 36, and 60 ]
• The incidence of acute and chronic Graft versus Host Disease (GvHD) in FCR001 recipients will be described [ Time Frame: Month 6, 12, 24, 36, and 60 ]
• The incidence of donor chimerism and level of chimerism by study visit in FCR001 recipients will be described [ Time Frame: Month 6, 12, 24, 36, and 60 ]
• The correlation of donor chimerism with freedom from IS)in FCR001 recipients will be described [ Time Frame: Month 6, 12, 24, 36, and 60 ]

Original Secondary Outcome Measures (submitted: June 20, 2019)

• Change in renal function by Modification of Diet in Renal Disease (MDRD4) from post-transplant baseline (Month 1) to Month 24 in FCR001 recipients [ Time Frame: 24 months post-transplant ]
  Renal function is evaluated by estimated glomerular filtration rate (eGFR) calculated using the MDRD4 formula (Coresh et al. 2003). Modification of Diet in Renal Disease (MDRD) formula is: GFR [mL/min/1.73m^2] = 186.3*(C^-1.154)*(A^-0.203)*G*R where C is the serum concentration of creatinine [mg/dL], A is patient age at sample collection date [years], G=0.742 when gender is female, otherwise G=1, R=1.21 when race is black, otherwise R=1.
• Proportion of FCR001 recipients free from IS, without BPAR, at Month 36 and 60 [ Time Frame: Month 36 and 60 post transplant ]
  Free from IS is defined as not taking any immunosuppression medications and not having to take immunosuppression medications since their withdrawal. Biopsy proven acute rejection is defined as Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018).
• Allograft function (eGFR by MDRD4) and change in eGFR from Month 1 to Month 24, 36, and Month 60, by treatment [ Time Frame: Month 1 (post-transplant) to Month 24, 36, and Month 60 ]
  Renal function is evaluated by estimated glomerular filtration rate (eGFR) calculated with the MDRD4 formula (Coresh et al. 2003). This formula is based on the four (4) variables of age, gender, ethnicity and serum creatinine.
• Slope and difference in slope of estimated glomerular filtration rate (eGFR) by Modification of Diet in Renal Disease (MDRD4) over time to Month 24, 36, and 60, by treatment [ Time Frame: Month 24, 36, and 60 ]
  Estimated glomerular filtration rate (eGFR) is calculated with the MDRD4 formula (Coresh et al. 2003).
• Allograft function (eGFR) and change in renal allograft function from Month 1 to Months 24, 36 and 60 by treatment group, using the CKD-EPI formula [ Time Frame: Month 1 (post transplant) to Month 24, 36, and Month 60 ]
  Estimated glomerular filtration rate (eGFR) is calculated using the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula (Levey et al. 2009).
• Time to the event for the composite of BPAR, graft loss, death or lost to follow-up and for each component, by treatment group [ Time Frame: Month 1 (post transplant) to Month 6, 12, 24, 36, and 60 ]
  Biopsy proven acute rejection is defined as Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018). Graft loss is defined as 56 consecutive days of hemodialysis or re-transplantation. Loss to follow-up is a subject whose status is unclear because he/she fails to appear for study visits without stating an intention to withdraw and did not respond to repeated attempts of contact, who did not experience graft loss or death from Day 1 and whose last day of contact was prior to study Month 60.
• Incidence of composite endpoint of BPAR, graft loss or death, by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  Biopsy proven acute rejection is defined as Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018). Graft loss is defined by 56 consecutive days of hemodialysis or re-transplantation.
• Incidence of composite endpoint of BPAR, graft loss, or death and lost to follow-up, by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  Biopsy proven acute rejection is defined as Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018). Graft loss is defined as 56 consecutive days of hemodialysis or re-transplantation. Loss to follow-up is a subject whose status is unclear because he/she fails to appear for study visits without stating an intention to withdraw and did not respond to repeated attempts of contact, who did not experience graft loss or death from Day 1 and whose last day of contact was prior to study Month 60.
• Incidence of BPAR and treated BPAR by severity and type (Banff 2017) and steroid-resistance, by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  Biopsy proven acute rejection is defined as Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018). Treated BPAR are those BPARs treated with antirejection medications. BPAR and treated BPAR will be characterized by severity, type and steroid resistance.
• Incidence of acute rejection [ Time Frame: Months 12, 24, 36 and 60 ]
  Acute rejection includes both clinically suspected and BPAR Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018).
• Incidence of de novo donor-specific antibodies [ Time Frame: Months 12, 24, 36 and 60 ]
  Newly formed anti-human leukocyte donor-specific antibodies
• Incidence or worsening of abnormal histologic findings of cellular or antibody-mediated chronic rejection, chronic glomerulopathy, tubular atrophy and interstitial fibrosis, C4d, calcineurin inhibitor induced damage, disease recurrence, BK [ Time Frame: Months 12, 24, 36 and 60 ]
  Kidney biopsies will be assessed for new or worsening abnormal histologic findings of cellular or antibody-mediated chronic rejection, chronic glomerulopathy, renal tubular atrophy and interstitial fibrosis, C4d (degradation product of activated complement factor C4 and is a sensitive marker for antibody-dependent humoral rejection) in peritubular capillaries, calcineurin inhibitor induced damage, recurrence of the primary condition leading to renal transplant, and BK viral nephropathy.
• Incidence of renal replacement therapy by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  Renal replacement therapy is defined by the need for hemodialysis following kidney transplant which is not due to delayed graft function.
• Incidence of BPAR or eGFR <50 mL/min by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  BPAR Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018). Estimated glomerular filtration rate (eGFR) is calculated using the MDRD4 formula (Coresh et al. 2003).
• Categorical distribution of eGFR according to CKD staging classification by treatment [ Time Frame: Months 12, 24, 36 and 60 ]
  Estimated glomerular filtration rate (eGFR), calculated by the MDRD4 formula (Coresh et al. 2003), is used to determine the stage of chronic kidney disease (CKD). The 5 stages of CKD based on GFR are: Stage 1 is GFR ≥ 90 mL/min/1.73 m^2; Stage 2 is GFR from 60 to 89 mL/min/1.73 m^2; Stage 3 is GFR from 30 to 59 mL/min/1.73 m^2; Stage 4 is GFR from 15 to 29 mL/min/1.73 m^2 and Stage 5 is GFR <15 mL/min/1.73 m^2.
• Incidence and severity of adverse events (AEs; including infections), serious adverse events (SAEs) [ Time Frame: Months 12, 24, 36 and 60 ]
  An Adverse Event (AE) is any untoward medical occurrence (ie, any unfavorable and unintended sign, symptom or disease). A Serious Adverse Event is defined as any AE (appearance of or worsening of any pre-existing undesirable sign, symptom or medical conditions) which meets any one of the following criteria: is fatal or life-threatening, results in persistent or significant disability/incapacity, constitutes a congenital anomaly/birth defect, requires inpatient hospitalization or prolongation of existing hospitalization, or is medically significant
• Incidence of BK viremia, viruria, infection, and nephropathy by treatment [ Time Frame: Months 12, 24, 36 and 60 ]
  BK virus infection is defined by virus detected by PCR-based assay in blood (viremia) or urine (viruria). BK infection of the kidney is defined as histologic evidence of BK viral infection on kidney biopsy and positive BK virus detected in blood or urine.
• Incidence of the adverse events of proteinuria, neurotoxicity, anemia, diabetes, hypertension, and dyslipidemia and their composite, by treatment [ Time Frame: Months 12, 24, 36 and 60 ]
  Adverse event reporting of proteinuria, neurotoxicity, anemia, diabetes, hypertension, and dyslipidemia.
• Urinary protein and albumin excretion, estimated by urinary protein/creatinine and urinary albumin/creatinine ratios by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  Proteinuria, a marker of renal dysfunction, is assessed by a urinary protein/creatinine ratio using urine sample protein and creatinine concentration measures. The ratio is a surrogate for a 24-hour urinary protein measurement. Similarly, a urinary albumin/creatinine ratio is a sensitive assessment of low levels of urine proteinuria.
• Incidence of major cardiovascular events and malignancies by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  Adverse events of major cardiovascular events and malignancies.
• Subject quality of life according to 36-Item Short Form Health Survey (SF-36) will be analyzed descriptively by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  The 36-Item Short Form Health Survey is a patient-reported outcome measure which assesses overall physical function, general health and social/psychological factors. The SF-36 consists of eight scaled scores, which are the weighted sums of the questions in their section. Each scale is directly transformed into a 0-100 scale on the assumption that each question carries equal weight. The lower the score the more disability. The higher the score the less disability i.e., a score of zero is equivalent to maximum disability and a score of 100 is equivalent to no disability.
• Subject quality of life according to End-Stage Renal Disease Symptom Checklist (ESRD-SCL) will be analyzed descriptively by treatment group [ Time Frame: Months 12, 24, 36 and 60 ]
  The End-Stage Renal Disease Symptom Checklist (ESRD-SCL) is also an outcome measure developed specifically for and validated in the end stage renal disease population. The ESRD-SCL covers six dimensions with a total of 43 items: limited physical capacity (10 items), limited cognitive capacity (8 items), cardiac and renal dysfunction (7 items), side effects of corticosteroids (5 items), increased hair and gum growth (5 items) as well as transplantation-associated psychological distress (8 items). All questions are scored on a five-point Likert scale. The higher the score the more unfavorable symptoms were reported.
• Incidence and duration of hospitalization and readmission, according to type of ward/unit [ Time Frame: Months 12, 24, 36 and 60 ]
  Hospital admissions and readmission by ward/unit and duration will be collected through serious adverse event reporting.
• Graft and patient survival and eGFR in FCR001 recipients who are only transiently chimeric [ Time Frame: Month 24, 36, and 60 ]
  Graft loss and death are used to determine graft survival and patient survival respectively. Both will be evaluated in FCR001 recipients who achieve a donor chimerism of >50% donor T-cells measured in recipient blood but then falls below 50% T-cells. Graft loss is defined as 56 consecutive days of hemodialysis or re-transplantation.
• To describe the incidence and severity of AEs (including infections) and SAEs among FCR001 donors [ Time Frame: Month 24, 36, and 60 ]
  An Adverse Event is any untoward medical occurrence (ie, any unfavorable and unintended sign, symptom or disease) in a subject or clinical investigation subject after providing written informed consent for participation in the study. A Serious Adverse Event is defined as any AE (appearance of or worsening of any pre-existing undesirable sign, symptom or medical conditions) which meets any one of the following criteria: is fatal or life-threatening, results in persistent or significant disability/incapacity, constitutes a congenital anomaly/birth defect, requires inpatient hospitalization or prolongation of existing hospitalization, or is medically significant. Adverse events and Serious Adverse Events for FCR001 donors will be summarized.
• Incidence of acute rejection, death, renal graft loss, and lost to follow-up between FCR001 recipients who did not achieve durable chimerism or the ability to wean or remain off immunosuppression vs. the control arm [ Time Frame: Month 24, 36, and 60 ]
  In this composite endpoint, acute rejection is defined as a BPAR Grade ≥1A according to the Banff 2017 Classification of Antibody-Medicated Rejection and T Cell-Mediated Rejection in Renal Allografts (Haas et al 2018). Renal graft loss is defined as 56 consecutive days of hemodialysis or re-transplantation. Loss to follow-up is a subject whose status is unclear because he/she fails to appear for study visits without stating an intention to withdraw and did not respond to repeated attempts of contact, who did not experience graft loss or death from Day 1 and whose last day of contact was prior to study Month 60. Durable chimerism is defined as maintaining at least 50% donor T-cells measured in recipient blood. For FCR recipients, inability to wean immunosuppression is defined as not meeting the criteria (BPAR >1A, chimerism <50% T-cells of donor, no graft versus host disease and having stable renal function) to discontinue their antirejection medications. Inability to remain
• The incidence of autologous infusions in FCR001 recipients [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Autologous hematopoietic stem cell transplantation for FCR001 recipients using their reserved frozen cells obtained prior to renal transplantation may be performed, only when medically warranted for safety reasons.
• The incidence of engraftment syndrome in FCR001 recipients. [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Engraftment syndrome is a clinical condition which can occur in recipients of hematopoietic stem cell transplantation that is characterized by some or all of the following: fever, skin rash, pulmonary edema, weight gain, liver, renal dysfunction and encephalopathy. This syndrome typically presents at the time of neutrophil recovery after hematopoietic stem cell transplantation.
• The incidence of blood component transfusions in FCR001 recipients [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Blood component transfusions include platelets, packed red blood cells, plasma and blood-clotting factor.
• The time to neutrophil and platelet recovery in FCR001 recipients. [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Time to neutrophil and platelet recovery is defined as the time it takes absolute neutrophil count to recover to > 500 cells/µL and platelet count to recover to >50K from their depression following conditioning therapy in preparation of FCR001 recipients to receive FCR001 cell therapy.
• The incidence of acute and chronic Graft versus Host Disease (GvHD) in FCR001 recipients will be described [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Graft versus host disease (GvHD) occurs when the donor's T cells (the graft) view the patient's healthy cells (the host) as foreign, and attack and damage them. Acute and chronic GvHD will be reported as adverse events.
• The incidence of donor chimerism and level of chimerism by study visit in FCR001 recipients will be described [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Donor chimerism is defined by > 50% donor T-cells measured in recipient blood.
• The correlation of donor chimerism with freedom from immunosuppression (IS) in FCR001 recipients will be described. [ Time Frame: Month 6, 12, 24, 36, and 60 ]
  Freedom from immunosuppression is defined as the ability to discontinue anti-rejection medications and not having to restart any antirejection medication. Donor chimerism is defined by > 50% donor T-cells measured in recipient blood.

• Current Other Pre-specified Outcome Measures: Not Provided
• Original Other Pre-specified Outcome Measures: Not Provided

Descriptive Information

• Brief Title: A Safety and Efficacy Study of FCR001 vs Standard of Care in de Novo Living Donor Kidney Transplantation
• Official Title: A Randomized, Controlled, Multi-center, Safety and Efficacy Study of FCR001 Cell-based Therapy Relative to a Tacrolimus and Mycophenolate-based Regimen in de Novo Living Donor Renal Transplant Recipients, and Safety in FCR001 Donors
• Brief Summary: A randomized controlled study to evaluate the safety, efficacy, and overall benefit of FCR001 cell therapy in de novo living donor renal transplantation.
• Detailed Description: The purpose of this randomized (2:1) controlled study is to evaluate the safety, efficacy and overall benefit of FCR001 cell therapy in first or second de novo living donor renal transplantation relative to a standard-of-care control immunosuppression regimen of antibody induction, tacrolimus, mycophenolate, and corticosteroids.
• Study Type: Interventional
• Study Phase: Phase 3
• Study Design: Allocation: Randomized; Intervention Model: Parallel Assignment; Masking: None (Open Label); Primary Purpose: Treatment
• Condition: Transplanted Organ Rejection

Intervention

Biological: FCR001

FCR001 is a cryopreserved allogeneic stem cell therapy derived from mobilized peripheral blood of the kidney donor that is delivered as a single dose with a non- myeloablative conditioning regimen. FCR001 contains the donor's CD34+ cells, facilitating cells, and αβ T cells.

Other Names:

• Cell based therapy
• Allogeneic stem cell transplant

Study Arms

• Experimental: FCR001
  FCR001 is a cryopreserved allogeneic stem cell therapy derived from mobilized peripheral blood of the kidney donor that is delivered as a single dose with a non- myeloablative conditioning regimen. FCR001 contains the donor's CD34+ cells, facilitating cells, and αβ T cells.
  Intervention: Biological: FCR001
• No Intervention: Control

  Standard induction therapy followed by a maintenance regimen of tacrolimus, mycophenolate, and +/- corticosteroids after kidney transplant.

  Control donors are not followed beyond randomization.

• Publications *: Not Provided

Recruitment Information

• Recruitment Status: Recruiting
• Estimated Enrollment (submitted: November 30, 2020): 240
• Original Estimated Enrollment (submitted: June 20, 2019): 120
• Estimated Study Completion Date: April 2025
• Estimated Primary Completion Date: April 2023 (Final data collection date for primary outcome measure)

Eligibility Criteria

Main Inclusion Criteria:

• Recipient age ≥18 years.
• Donor age ≥18 and ≤60 years at time of signing informed consent.
• Recipients of a first or second living donor kidney transplant
• Donor willing to undergo mobilization, apheresis and 12-month safety follow-up and meet all local standard eligibility criteria to donate stem cells for allogeneic transplantation.
• Recipient meets all local standard eligibility criteria for allogeneic stem cell transplant.
• Donors must be deemed eligible as per the requirements of 21CFR1271.

Main Recipient and Donor Exclusion Criteria:

• Recipient and donor who are identical twins.
• Recipient or donor with history of malignancy or premalignant syndrome (e.g., myelodysplastic syndrome, monoclonal gammopathy of renal significance [MGRS], monoclonal gammopathy of unknown significance [MGUS]) of any organ system (other than localized basal cell carcinoma of the skin or in-situ cervical cancer), treated or untreated, within the past 5 years, regardless of whether there is evidence of local recurrence or metastases.
• Recipient or donor with known bone marrow aplasia.

Main Recipient-only Exclusion Criteria:

• Multi-organ or stem cell transplant recipient.
• Calculated panel reactive antibodies >80%.
• Recipient is blood type ABO incompatible with donor.
• Presence of donor-specific antibodies (DSA) (positive result) at any time pre-transplant.
• Recipient who is human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg) or hepatitis C virus (HCV) positive.
• Recipient with any baseline condition requiring or anticipated will require chronic or intermittent use of systemic steroids or other IS (eg, autoimmune disease, asthma) throughout the course of the study.
• Recipient with a BMI < 18 or > 35 kg/m2.
• Recipient requiring systemic anticoagulation, (eg, for hyper-coagulation disorders, deep vein thrombosis, atrial fibrillation) that cannot be temporarily interrupted which would preclude renal biopsy.

Main Donor-only Exclusion Criteria:

• Biologically unrelated (i.e., no genetic relationship) female donor transplant to male recipient.

Sex/Gender

• Sexes Eligible for Study: All

• Ages: 18 Years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Listed Location Countries: United States

Administrative Information

• NCT Number: NCT03995901
• Other Study ID Numbers: FCR001A2301
• Has Data Monitoring Committee: Yes

U.S. FDA-regulated Product

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: No

IPD Sharing Statement

• Plan to Share IPD: No

• Current Responsible Party: Talaris Therapeutics Inc.
• Original Responsible Party: Same as current
• Current Study Sponsor: Talaris Therapeutics Inc.
• Original Study Sponsor: Same as current
• Collaborators: Not Provided
• Investigators: Not Provided
• PRS Account: Talaris Therapeutics Inc.
• Verification Date: July 2022