Malignancy Post Heart Transplantation

High rates of de novo malignancy compromise post-heart transplantation survival

BACKGROUND

Transplant patients are known to have increased risk of developing de novo malignancies (DNMs). As post-transplant survival increases, DNM represents an obstacle to further improving survival. We sought to examine the incidence, types, and risk factors for post-transplant DNM.

METHODS

We studied adult heart transplant recipients from the Organ Procurement and Transplantation Network database (1987-2018). Kaplan-Meier survival analysis was performed to determine annual probabilities of developing DNM, excluding squamous and basal cell carcinoma. Rates were compared to the general population in the Surveillance, Epidemiology, and End Results database. Cox proportional hazards regression was performed to calculate hazard ratios for risk factors of DNM development, all-cause, and cancer-specific mortality.

RESULTS

Over median follow-up of 6.9 years, 18% of the 49,361 patients developed DNM, which correlated with an incidence rate 3.8 times that of the general population. The most common malignancies were lung, post-transplant lymphoproliferative disorder, and prostate. Risk was most increased for female genital, tongue/throat, and renal cancers. Male gender, older age, smoking history, and impaired renal function were risk factors for developing DNM, whereas the use of MMF for immunosuppression was protective. Cigarette use, increasing age, the use of ATG for induction and calcineurin inhibitors for maintenance were risk factors for cancer-specific mortality. The development of a DNM increased the risk of death by 40% (p < .001).

CONCLUSIONS

Heart transplant patients are at increased risk of malignancy, particularly rare cancers, which significantly increases their risk of death. Strict cancer surveillance and attention to immunosuppression are critical for prolonging post-transplant survival.

Immunosuppressive Medication and Non-Rejection-Related Complications Following Heart Transplantation

Background: Although the clinical evolution of a patient with heart failure is initially improved by transplantation, a number of potential complications may occur in the post-transplant period, which may be directly related to the effects of chronic immunosuppression. The purpose of this study was to analyze the occurrence and frequency of post-transplant complications related to immunosuppressive treatment in the Institute of Cardiovascular Diseases and Transplantation of Târgu Mureș, Romania.

Material and methods: This is a descriptive study including 53 patients out of a total of 71 patients who underwent cardiac transplantation between 2000 and 2017 in the Institute of Cardiovascular Disease and Cardiac Transplantation in Târgu Mureș, Romania. Data were collected from the patient files and included demographic, clinical and laboratory data, as well as information about post-transplant complications related to immunosuppressive treatment.

Results: The mean age of patients undergoing heart transplantation was 40.72 ± 14.07 years, the majority of patients being male (84.91%) and living in an urban environment (56.60%). The average length of hospital stay was 33.6 days. From the total number of patients, 7 (13.2%) presented post-transplantation bacterial infections, while antibodies indicating the presence or history of B hepatitis, toxoplasma, and cytomegalovirus infection were identified with a relatively high incidence in the study population.

Conclusions: Infections following surgery are probably the most common post-transplant pathology, the primary reason being the administration of immunosuppressive medication.

The change of immunosuppressive regimen from calcineurin inhibitors to mammalian target of rapamycin (mTOR) inhibitors and its effect on malignancy following heart transplantation

Malignancy is a significant cause of mortality after organ transplantation. There is an increased rate of malignancy following heart transplantation (HTx) compared to the general population and other organ transplant recipients. Post-HTx patients with a history of malignancy are also at a higher risk of developing new malignancies or exacerbation of their existing malignancies. Mammalian target of Rapamycin inhibitors (mTORIs) are newly introduced immunosuppressive drugs with a unique mechanism of action. By changing the immunosuppressive regimen from classic drugs, especially calcineurin inhibitors (CNIs) to mTORIs, the rate of developing de novo malignancies and the relapse of former malignancies is significantly reduced. However, issues like allograft function, total surveillance of patients, and post-transplantation complications should be considered during the conversion of drug regimens utilizing CNIs to drug regimens employing mTORIs. We reviewed different post-heart transplant maintenance immunosuppressive regimens and their effect on post-HTx malignancies with a focus on mTORIs, compared safety against effectiveness, and gathered conclusions based on our review of the literature, which may lead clinicians to make a better evidence-based decision regarding post-HTx maintenance immunosuppressive drug regimens. Overall, CNI to mTORI conversion in post-HTx maintenance immunosuppressive drug regimens was associated with a reduced rate of developing malignancy in post-HTx patients. Furthermore, nephrotoxicity decreased significantly while using mTORIs in combination with lower doses of CNIs and the rejection rate was equivalent to CNI-only regimens. In conclusion, mTORI-based maintenance immunosuppressive drug regimens seem to be safe and beneficial when considering efficacy vs. adverse effects, and all-cause mortality rates are significantly lower in patients switched to mTORIs when compared to CNI recipients.