The human papillomavirus (HPV) vaccine, recommended by the Centers for Disease Control and Prevention for the prevention of HPV-associated genital warts and neoplasia, appears to be an effective and perhaps underappreciated treatment of existing cutaneous warts, according to expert speaking at the annual Coastal Dermatology symposium, held virtually.
Dr. Theodore Rosen
, but a recently published review provides strong evidence that this is a practical clinical strategy, according to Theodore Rosen, MD, professor of dermatology at Baylor College of Medicine, Houston.
“Clearly, if you have someone, particularly a youngster, and you’re having trouble getting rid of their warts and they are age 9 years or above – and they need the vaccine anyhow – that’s a win-win proposition,” Dr. Rosen said.
The current nonavalent HPV vaccine is approved for individuals from age 9 to age 45. Although the CDC recommends routine vaccination at age 11 or 12 years, it allows earlier vaccination within the label.
The recently published and updated evidence of a benefit from treatment comes from a systematic literature review. For the review, 63 articles were drawn from the PubMed and Cochrane databases. The studies yielded 4,439 patients with cutaneous warts at the time they received the HPV vaccine or who specifically received vaccine as a treatment strategy.
As has been suggested previously in the case series and in a limited number of prospective studies, the majority of warts, including cutaneous warts and anogenital warts, resolved following vaccine administration.
“Mostly these were common warts, plantar warts, and flat warts,” Dr. Rosen said, but the paper also reported successful treatment of recurrent respiratory papillomatosis, squamous cell carcinomas, and basal cell carcinomas.
Case reports and small studies associating HPV vaccine with successful resolution of warts are easy to find in the literature. For example, 60% of patients achieved a complete response and 30% a partial response to HPV vaccine in one small prospective study of 26 patients with genital warts. Following vaccination, no recurrences were observed after a median follow-up of more than 8 months.
In the review paper, most of the cases involved patients who received the quadrivalent HPV vaccine, Dr. Rosen noted. Only one received the updated nonavalent vaccine, which, in addition to protection against the 6, 11, 16, and 18 subtypes extends protection to subtypes 31, 33, 45, 52, and 58.
“You would expect the nonavalent vaccine to provide the same protection. It is the same vaccine. It just offers activity against more subtypes,” Dr. Rosen said at the meeting, jointly presented by the University of Louisville and Global Academy for Medical Education. He reported that he personally has used the nonavalent vaccine successfully to treat a cutaneous wart.
The nonavalent vaccine can be administered in just two doses for those who receive the first dose before age 15. In others, it is given in three doses at 1- to 2-month intervals, according to Dr. Rosen. He said the efficacy for preventing genital warts and most HPV-related neoplasia exceeds 90%, although it is lower for penile and anal cancer. The protection extends for at least 10 years, but he said that he believes that it is likely to be longer.
“The HPV vaccine is really, really safe,” Dr. Rosen said. Besides injection-site reactions, the most common adverse event is syncope. For this reason, patients are advised to stay seated for 30 minutes after administration.
There is some evidence for cross-immunity for HPV subtypes not covered by the vaccine, particularly among children, Dr. Rosen commented. Citing the review article, he said that, although almost all HPV-associated warts resolve in children when treated with the vaccine, response is somewhat lower in adolescents and further reduced in adults.
In an interview, the senior author of the recent literature review, Natasha A. Mesinkovska, MD, PhD, associate professor of dermatology, University of California, Irvine, agreed with Dr. Rosen about the value of HPV vaccine for patients not responding to conventional therapies for HPV-related cutaneous warts.
“I think HPV vaccine is an excellent option for those patients, even older ones at 45 years of age if cost is not an issue,” she said. She did offer a caveat. In a recent statement from the International Papillomavirus Society (IPVS) on a world shortage of HPV vaccine, it was estimated that supplies might be limited for the next 3-5 years.
Given this shortage, “obtaining them currently may prove to be difficult,” she cautioned.
This publication and Global Academy for Medical Education are owned by the same parent company.