Tofacitinib: A Treatment Option for Recalcitrant Polymorphic Light Eruption and Its Mechanistic Rationale.

Background

Polymorphous light eruption is largely characterized by a delayed-type (type IV) hypersensitivity reaction to 1 or more undefined endogenous ultraviolet-induced skin antigens.

Objectives

To evaluate the efficacy of tofacitinib in refractory cases of polymorphous light eruption.

Methods

Seven patients who had failed multiple systemic treatments or relapsed within 2 weeks of existing systemic agents with concomitant photoprotection were offered tofacitinib after written consent.

Results

Initiation of tofacitinib led to a marked reduction of itching (mean ± SD 3.1 ± 1.12 days) followed by clinical resolution (mean ± SD 2.6 ± 1.1 weeks). The duration of therapy ranged from 1 to 3 months (mean ± SD 2 ± 0.63 months), and 4 of 7 patients had a recurrence in 5.5 weeks and were again initiated on tofacitinib with a prompt response.

Conclusion

Tofacitinib inhibits Janus kinase (JAK)1 and JAK3 thus it can abrogate the effects of the predominant cytokine milieu of polymorphic light eruption (PMLE) and thus reduce the expression of aberrant inflammatory T lymphocyte expression in PMLE.