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Beyond the transplant


Solid organ transplantation

To prevent organ rejection, a lifelong, daily regimen of chronic immunosuppression is necessary to suppress the transplant recipient’s immune system.

Although chronic immunosuppressant treatment can be effective at preventing organ rejection, it can have many drawbacks, including:
  • kidney damage, potentially leading to loss of the transplanted organ
  • increased risk of cancer and infections
  • significant cardiovascular, metabolic, or neurologic complications that prompt need for many other medications (often 20 or more pills per day)
  • cost and lifestyle burdens, which can lead to non-compliance, thereby adversely affecting outcomes

FCR001, an investigational cell therapy: Harnessing the power of immune tolerance in the setting of living kidney donor transplant.

This video highlights the Talaris approach to kidney transplant care utilizing FCR001, an investigational allogeneic cell therapy product. The goal of this approach is to establish durable chimerism and drug-free immune tolerance in living donor kidney transplant recipients, across degrees of human leukocyte antigen (HLA)–mismatch.

Facilitated allogeneic HSCT for living donor kidney transplant

Our initial focus is on living donor kidney transplant (LDKT). Long-term outcomes in LDKT are suboptimal due to the complications associated with taking lifelong chronic immunosuppression medications. We believe FCR001 has the potential to establish durable allogeneic tolerance in LDKT recipients to their transplanted organ, thereby permitting the LDKT recipient to discontinue all chronic immunosuppression within approximately twelve months of their transplant, without rejecting the transplanted organ. FCR001 has been granted Regenerative Medicine Advanced Therapy (RMAT) and Orphan Drug designations by the U.S. Food and Drug Administration (FDA) in this indication.

We believe that our Facilitated Allo-HSCT Therapy has the potential to reprogram the immune system of recipients of solid organ transplants to recognize the donated organ as “self,” thereby avoiding organ rejection without the degree of toxicities, risks, co-morbidities, and burden of compliance associated with chronic immunosuppression.

Phase 2 clinical trial results

In our Phase 2 trial of 37 adult LDKT patients treated with FCR001, 26 of 37 patients (70%) were able to completely discontinue their chronic immunosuppression approximately one year after receiving their transplant. After mid-course optimizations to the Phase 2 protocol, 14 of the last 17 patients (82%) in the trial were able to discontinue their chronic immunosuppression by approximately one year post-transplant. Every transplant recipient who was weaned off immunosuppression has remained off chronic immunosuppression, without any organ rejection, for the duration of their follow-up.

As of January 31, 2021, we have followed these patients for a median of over six years post-transplant, and the longest for over 11 years post-transplant, with no evidence of biopsy-proven acute rejection. These results were achieved despite significant degrees of immune system human leukocyte antigen (HLA) mismatch between the donors and recipients, and the degree of immune mismatch between the donor and recipient did not appear to impact the safety or efficacy of our therapy candidate.  Moreover, preliminary data indicates that patients who were weaned off immunosuppression with FCR001 had preserved kidney function and third-party data suggests a markedly lower reliance on cardiovascular medications at four years post-transplant compared to traditional transplants with chronic immunosuppression over a similar time frame.

We continue to monitor the patients in our Phase 2 trial for long term safety and durability of effect. Through January 31, 2021, we have accumulated approximately 235 patient-years of exposure to FCR001 in LDKT, and the safety profile in our patients is generally consistent with that expected if a patient were to separately receive both a standard kidney transplant and an allo-HSCT with nonmyeloablative conditioning. As of January 31, 2021, five-year survival rates of the patients enrolled in our Phase 2 and of their transplanted kidneys were comparable to what is reported for standard LDKT according to the United Network for Organ Sharing (UNOS).


“The transplant community as a whole — we need more innovation, we need more support and better treatments But we really need more innovation because being immune-compromised affects every aspect of your life.”

— Mary Baliker, author, healthcare professional and kidney transplant recipient

Other programs in kidney transplantation

We have initiated a clinical development program in “delayed tolerance” in living donor kidney transplant in which we will evaluate whether FCR001 can induce durable immune tolerance to the transplanted organ when it is administered to LDKT recipients up to one year following their kidney transplant. We are also conducting preclinical research to explore whether we can successfully procure and process cells from deceased donors. If these efforts are successful, this could extend the potential of our Facilitated Allo-HSCT Therapy to benefit recipients of organs from deceased donors, significantly expanding our approach to kidney transplant and other solid organ transplant patients.

Ongoing clinical trials

Freedom 1 and Freedom 2 clinical study logos

We are running a Phase 3 trial of FCR001 in living donor kidney transplant, called FREEDOM-1. We are also running a Phase 2 trial in “delayed tolerance” living donor kidney transplant, called FREEDOM-2. Learn more >>

If you are a health care provider and would like to receive more information about our clinical trials, please email

If you are a patient and would like to receive more information about our clinical trials, please email