Kidney transplant between people with HIV is safe, says US study

Image: A transplant in progress. Scott & White Healthcare. Creative Commons licence.

The kidneys of deceased HIV-positive donors can be safely transplanted into people living with HIV who have end-stage kidney disease, investigators report in the American Journal of Transplantation. Outcomes were every bit as good as those observed in people with HIV whose kidney donor was HIV negative.

“We report the first results of HIV-positive donor to HIV-positive recipient kidney transplantation in the United States, and directly compare outcomes in HIV-positive recipients of HIV-negative donor kidneys to evaluable attributable risk of HIV-positive donors,” write the authors. “Overall patients and graft [transplanted organ] survival were excellent and comparable, without evidence of increased serious adverse events of HIV-related complications such as breakthrough viremia, infectious hospitalizations, or opportunistic infections.”

However, there was some evidence that kidneys from HIV-positive donors were more likely to be rejected, a finding that is worth following up in further research, say the authors.

Glossary

opportunistic infection (OI)

An infection that occurs more frequently or is more severe in people with weakened immune systems, such as people with low CD4 counts, than in people with healthy immune systems. Opportunistic infections common in people with advanced HIV disease include Pneumocystis jiroveci pneumonia; Kaposi sarcoma; cryptosporidiosis; histoplasmosis; other parasitic, viral, and fungal infections; and some types of cancer. 

pilot study

Small-scale, preliminary study, conducted to evaluate feasibility, time, cost, adverse events, and improve upon the design of a future full-scale research project.

 

end-stage disease

Final period or phase in the course of a disease leading to a person's death.

acute infection

The very first few weeks of infection, until the body has created antibodies against the infection. During acute HIV infection, HIV is highly infectious because the virus is multiplying at a very rapid rate. The symptoms of acute HIV infection can include fever, rash, chills, headache, fatigue, nausea, diarrhoea, sore throat, night sweats, appetite loss, mouth ulcers, swollen lymph nodes, muscle and joint aches – all of them symptoms of an acute inflammation (immune reaction).

statistical significance

Statistical tests are used to judge whether the results of a study could be due to chance and would not be confirmed if the study was repeated. If result is probably not due to chance, the results are ‘statistically significant’. 

An increasing number of people living with HIV have end-stage kidney disease and are in need of a kidney transplant. Pioneering research in South Africa showed that it was possible for the kidneys of HIV-positive donors to be successfully transplanted into HIV-positive recipients. In 2013 the United States Congress passed the HIV Organ Policy Equality (HOPE) Act, making similar transplants possible in the US within the context of research.

Dr Christine Durand and her co-investigators from the Hope in Action project wanted to get a clearer understanding of outcomes among individuals with HIV who received a kidney of an HIV-positive donor. They also wished to expand the existing research base by comparing these outcomes with those of  HIV-positive kidney transplant patients who had an HIV-negative donor.

The study involved 75 people with HIV who received a kidney from a deceased donor between 2016 and 2019. In 25 cases, the donor was another person with HIV. The research involved people who received care at 14 treatment centres across the US. Outcomes analysed in the research were overall survival, transplant failure, risk of infections and rebound in HIV viral load.

The median age of the transplant recipients was 51 years, 71% were male, 85% were African American and 23% were co-infected with hepatitis C virus. All were taking antiretrovirals and had an undetectable viral load. Average CD4 cell count was over 500 suggesting excellent immune competence. None had a current opportunistic infection, but 16% had had one in the past. All were cancer free.

The most common cause of kidney failure was high blood pressure (36%) followed by HIV-associated kidney disease (29%). As regards post-transplant induction therapy, 64% received basiliximab and 33% antithymocyte globulin.

There were 57 donors, all deceased. Fifteen were HIV positive, nine of whom were on antiretrovirals at the time of death and five had a viral load below 400. The other six HIV-positive donors (five of whom were previously undiagnosed) had a median viral load of over 183,000.  Their median age was 30 years.

The median period of post-transplant follow-up was 1.4 years for individuals with an HIV-positive donor and 1.8 years for individuals with an HIV-negative donor. Both groups had 100% survival during the follow-up period.

Delayed graft function – acute kidney injury requiring dialysis in the first week after transplant – was more likely among the recipients of kidneys of HIV-negative donors than those receiving a kidney from an HIV-positive donor (42% vs 12%, p = 0.01). The one-year graft survival rate was excellent in both groups (91% vs 92%). There were only seven transplant failures, two of which involved kidneys from an HIV-positive donor. Causes of graft failure included thrombosis (two cases) and rejection (four cases). The risk of transplant failure was comparable between the two donor groups.

"Outcomes were every bit as good as those observed in people with HIV whose kidney donor was HIV-negative."

Rejection occurred in 44% of the HIV-positive donor group and 32% of the HIV-negative donor group. Most (81%) had a single episode of rejection. The one-year rejection rate was higher among those with an HIV-positive donor than those with an HIV-negative donor (50% vs 29%). While this difference was not statistically significant, the investigators believe the finding is worthy of further research. Type of antiretroviral therapy was not associated with the risk of rejection.

Kidney function one year after transplant was comparable between the two groups (HIV-positive vs HIV-negative donor = eGFR 63ml/min vs 57 ml/min). Also comparable were rates of serious adverse events (1.1 per person year in both groups), infections requiring hospitalisation (28% vs 26%) and opportunistic infections (16% vs 12%).

Viral load rebounded in four cases, but not because of HIV superinfection (acquisition of a second strain of HIV). Each case was due to antiretrovirals being interrupted because of insurance difficulties. In each case, viral load fell back below the limit of detection once antiretrovirals were restarted.

“In this multicentre, real-world observational pilot study, we found that HIV donor-positive/recipient-positive kidney transplantation was safe and feasible and associated with excellent short-term patient survival and graft survival,” conclude Dr Durand and her colleagues. “This unique donor source has the potential to mitigate disparities for a vulnerable population that faces lower access to transplant and higher waitlist mortality.”

References

Durand CM et al. A prospective multicenter pilot study of HIV-positive deceased donor to HIV-positive donor recipient kidney transplantation: Hope in Action. American Journal of Transplantation, online ahead of print, 23 July 2020.

doi: 10.1111/ajt.16205

Full image credit: '7:08 pm - Procedure (transplant in progress)'. Scott & White Healthcare. Available at www.flickr.com/photos/swhealthcare/14274501170 under a Creative Commons licence CC BY-NC-ND 2.0.