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Updated: Apr 17, 2026

Murine Full-thickness Skin Transplantation
Published on: January 2, 2017
Skin cancer in solid organ transplant recipients: are mTOR inhibitors a game changer?
1Section of Experimental Surgery, Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss-Allee 11, Regensburg, 93053 Germany.
Abstract:
While immunosuppressive agents are necessary to prevent the rejection of transplanted organs, and are a great medical success story for protecting against early allograft loss, graft and patient survival over the long term are diminished by side effects from these same drugs. One striking long-term side effect is a high rate of skin cancer development. The skin cancers that develop in transplant recipients tend to be numerous, as well as particularly aggressive, and are therefore a major contributor to morbidity and mortality in transplant recipients. An apparent reason for the high incidence of skin cancer likely relates to suppression of immune surveillance mechanisms, but other more direct effects of certain immunosuppressive drugs are also bound to contribute to cancers of UV-exposed skin. However, over the past few years, evidence has emerged to suggest that one class of immunosuppressants, mammalian target of rapamycin (mTOR) inhibitors, could potentially inhibit skin tumour formation through a number of mechanisms that are still being studied intensively today. Therefore, in light of the high skin cancer incidence in transplant recipients, it follows that clinical trials have been conducted to determine if mTOR inhibitors can significantly reduce these post-transplant skin malignancies. Here, the problem of post-transplant skin cancer will be briefly reviewed, along with the possible mechanisms contributing to this problem, followed by an overview of the relevant clinical trial results using mTOR inhibitors.
Insights
Immunosuppressive drugs increase skin cancer risk in transplant patients. Mammalian target of rapamycin (mTOR) inhibitors show promise in reducing these post-transplant skin malignancies, offering a potential new strategy for patient care.
Area of Science:
- Oncology
- Transplantation Medicine
- Dermatology
Background:
- Immunosuppressive agents are vital for preventing organ transplant rejection but are associated with significant long-term side effects.
- A notable side effect is an increased incidence of numerous and aggressive skin cancers in transplant recipients.
- This heightened risk is attributed to suppressed immune surveillance and direct drug effects on UV-exposed skin.
Purpose of the Study:
- To review the problem of post-transplant skin cancer.
- To explore potential mechanisms contributing to skin cancer development in transplant patients.
- To summarize clinical trial results evaluating mammalian target of rapamycin (mTOR) inhibitors for reducing post-transplant skin malignancies.
Main Methods:
- Review of existing literature on post-transplant skin cancer.
- Analysis of proposed mechanisms of skin carcinogenesis linked to immunosuppression.
- Examination of clinical trial data on the efficacy of mTOR inhibitors in preventing skin tumors.
Main Results:
- Transplant recipients exhibit a high rate of aggressive skin cancers, impacting morbidity and mortality.
- Mammalian target of rapamycin (mTOR) inhibitors are being investigated for their potential to inhibit skin tumor formation.
- Clinical trials are assessing the effectiveness of mTOR inhibitors in reducing post-transplant skin malignancies.
Conclusions:
- Post-transplant skin cancer is a significant clinical challenge.
- mTOR inhibitors present a promising therapeutic avenue for mitigating skin cancer risk in transplant recipients.
- Further research into mTOR inhibitor mechanisms and clinical application is warranted.
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