The increased risk of vitiligo found in recipients of stem cell and solid organ transplants, especially those who develop graft-versus-host disease (GVHD), requires careful monitoring, according to authors of a study published online in JAMA Dermatology December 13.
In the cohort study, the greatest risk occurred with hematopoietic stem cell transplants (HSCTs) and in cases involving GVHD. Kidney and liver transplants carried slight increases in risk.
"The findings suggest that early detection and management of vitiligo lesions can be improved by estimating the likelihood of its development in transplant recipients and implementing a multidisciplinary approach for monitoring," wrote the authors, from the departments of dermatology and biostatistics, at the Catholic University of Korea, Seoul.
Using claims data from South Korea's National Health Insurance Service database, the investigators compared vitiligo incidence among 23,829 patients who had undergone solid organ transplantation (SOT) or HSCT between 2010 and 2017 versus that of 119,145 age- and sex-matched controls. At a mean observation time of 4.79 years in the transplant group (and 5.12 years for controls), the adjusted hazard ratio (AHR) for vitiligo among patients who had undergone any transplant was 1.73. AHRs for HSCT, liver transplants, and kidney transplants were 12.69, 1.63, and 1.50, respectively.
Patients who had undergone allogeneic HSCT (AHR, 14.43) or autologous transplants (AHR, 5.71), as well as those with and without GVHD (24.09 and 8.21, respectively) had significantly higher vitiligo risk than the control group.
Among those with GVHD, HSCT recipients (AHR, 16.42) and those with allogeneic grafts (AHR, 16.81) had a higher vitiligo risk than that of control patients.
In a subgroup that included 10,355 transplant recipients who underwent posttransplant health checkups, investigators found the highest vitiligo risk — AHR, 25.09 versus controls — among HSCT recipients with comorbid GVHD. However, patients who underwent SOT, autologous HSCT, or HSCT without GVHD showed no increased vitiligo risk in this analysis. "The results of health checkup data analysis may differ from the initial analysis due to additional adjustments for lifestyle factors and inclusion of only patients who underwent a health checkup," the authors wrote.
Asked to comment on the results, George Han, MD, PhD , who was not involved with the study, told this news organization, "this is an interesting paper where the primary difference from previous studies is the new association between GVHD in hematopoietic stem cell transplant recipients and vitiligo." Prior research had shown higher rates of vitiligo in HSCT recipients without making the GVHD distinction. Dr. Han is associate professor of dermatology in the Hofstra/Northwell Department of Dermatology, Hyde Park, New York.
Although GVHD may not be top-of-mind for dermatologists in daily practice, he said, the study enhances their understanding of vitiligo risk in HSCT recipients. "In some ways," Dr. Han added, "the association makes sense, as the activated T cells from the graft attacking the skin in the HSCT recipient follow many of the mechanisms of vitiligo, including upregulating interferon gamma and the CXCR3/CXCL10 axis."
Presently, he said, dermatologists worry more about solid organ recipients than about HSCT recipients because the long-term immunosuppression required by SOT increases the risk of squamous cell carcinoma (SCC). "However, the risk of skin cancers also seems to be elevated in HSCT recipients, and in this case the basal cell carcinoma (BCC):SCC ratio is not necessarily reversed as we see in solid organ transplant recipients. So the mechanisms are a bit less clear. Interestingly, acute and chronic GVHD have both been associated with increased risks of BCC and SCC/BCC, respectively."
Overall, Dr. Han said, any transplant recipient should undergo yearly skin checks not only for skin cancers, but also for other skin conditions such as vitiligo. "It would be nice to see this codified into official guidelines, which can vary considerably but are overall more consistent in solid organ transplant recipients than in HSCT recipients. No such guidelines seem to be available for HSCTs."
The study was funded by the Basic Research in Science & Engineering program through the National Research Foundation of Korea, which is funded by the country's Ministry of Education. The study authors had no disclosures. Dr. Han reports no relevant financial interests.
This article originally appeared on MDedge.com, part of the Medscape Professional Network.
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