First Good Estimates of LPP and FFA Incidence

New Data on LPP and FFA Incidence

Lavian and Trager performed a retrospective review of LPP and FFA cases seen in New York at two large hospital. They calculated the one year indigence of LPP and FFA between Jan 2018 and Dec 2018 using the ICD 10 code L66.1. All confirmed cases were subsequently validated by the authors.

They found 170 patients with an ICD 10 code of L66.1 that they ultimately used  in their analysis in the year 2018. There were 1,189,507 patients without the ICD 10 code L66.1 that were used as controls.

There were 94 LPP and 76 FFA patients. 77.1 % of FFA and LPP patients were females. The most common race was white non Hispanic.

 RESULTS

Overall the standard incidence for LPP was 12.75 per 1000,000 or in in 1:7843. The breakdown for LPP and FFA was

LPP incidence : 1 in 13,605 (7.35 per 100,000)

FFA incidence : 1 in 18,484 (5.41 per 100,000)

Overall, 50-60 year old patients had the highest incidence of LPP and FFA. LPP was most common in white followed by Asian and black. FFA was most common in Asian followed by white and black.  

Conclusion

This is a really important study which highlight incidence data in a way that has never been looked at before. For every 1 million population, we’re going to expect some 125 new cases of LPP and FFA this coming year. This is likely divided as 74 LPP new cases and 54 new FFA cases.

This is powerful information which allows us to better understand these conditions.

REFERENCE

Lavian J et al. Incidence estimates for lichen planopilaris and frontal fibrosing alopecia in a New York City health care system.Dermatol Online J. 2021 Aug 15;27(8).