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Failure of everolimus in the management of Kaposi’s sarcoma in HOPE Act recipient following simultaneous liver and kidney transplantation

Received: July 13, 2020; Accepted: July 22, 2020; Published: July 27, 2020 Abbreviations: DNA: deoxyribonucleic acid; HAART: highly active antiretroviral therapy; HHV-8: human gammaherpesvirus 8; HIV: human immunodeficiency virus; HOPE Act: the HIV Organ Policy Equity Act; KS: Kaposi’s sarcoma; MMF: mycophenolate mofetil; mTOR inhibitor: the mammalian target of rapamycin inhibitor; RNA: ribonucleic acid; SLKTx: simultaneous liver kidney transplant


Dear Editors,
It is expected that HIV-related immunodeficiency, cirrhosisassociated cytopenia and potent immunosuppression put simultaneous liver and kidney transplant (SLKTx) recipients with HIV at increased risk of infections and malignancies such as Kaposi's sarcoma (KS). Surprisingly, existing data suggest that incidence and severity of KS are similar between HIV+ and HIV-transplant recipients, and require similar management with reduction of the immunosuppression and transition to mTOR inhibitor [1]. The benefit of mTOR inhibition by sirolimus for KS has been demonstrated in transplant and nontransplant populations; however, the data on everolimus in KS patients are limited [2]. A multicenter trial of everolimus in classic KS failed to show the oncologic benefit [3]. In transplant population, the everolimus experience for management of KS has been limited to a few case reports and its anti-tumor properties have not demonstrated a consistent success [4]. We report a case of de novo KS in a HOPE Act SLKTx recipient that was resistant to everolimus, but with transition to sirolimus demonstrated significant tumor reduction.
The recipient is a 46-year-old gentleman with end-stage liver and chronic kidney disease. He was diagnosed with HIV in 1999 and initiated HAART in 2002 without history of antiretroviral resistance. At the time of transplant, his HIV-1 RNA was non-detectable and CD4 count was 129. The SLK offer from a 37-year-old brain-dead donor became available. The donor had history of HIV since 2005, was on HAART at the time of the donation with 6,038 copies/ml of HIV-1 RNA and CD4 count of 7.
The recipient underwent induction with thymoglobulin (3mg/ kg) and methylprednisolone, and was started on tacrolimus and mycophenolate mofetil (MMF). His chemoprophylaxis included sulfamethoxazole/trimethoprim and valganciclovir. Post-operatively his liver function tests have normalized and creatinine stabilized at 2.25 mg/dl. His early course was complicated by arrhythmias, pneumonia, tracheostomy, malnutrition, presumed mycobacterium avium complex infection and borderline cellular rejection of the kidney managed with pulse steroids.
Four months post-SLKTx, patient developed 2.5x2 cm purple plaque adjacent to his liver transplant incision ( Figure 1A). The punch biopsy was consistent with KS, characterized by dense vascular proliferation of anastomosing vascular channels with plump, spindled endothelial cells, +HHV8 stain and abundant extravasated erythrocytes. At the time of KS diagnosis, his CD4 count was 93.
The management included transition from tacrolimus (level 8ng/ mL)/MMF to everolimus alone (level 12ng/ml). It was elected not to pursue doxorubicin treatment given patient's preexisting pancytopenia. During the 5-month everolimus monotherapy, the tumor persisted ( Figure 1B). HHV-8 was detected at 47 DNA molecules/microliter. Patient was transitioned to sirolimus (level 15ng/ml) monotherapy, with significant tumor reduction two months after the switch ( Figure  1C). Simultaneously, his CD4 count increased to 140 and HHV-8 quantitative PCR became non-detectable.
This case emphasizes the complex balance of managing an opportunistic disease in immunocompromised and debilitated HOPE Act SLKTx recipient with low CD4 counts and history of rejection. Minor structural differences, bioavailability, hepatic metabolism and tissue distribution of mTOR inhibitor analogs may have important clinical consequences [5]. Therefore, further investigations are needed to understand if everolimus is efficacious in management of KS in HIV+ recipients.

Funding Sources
"The authors have no funding to disclose. "