Primary study · included by 1 review

Influence of treatment of erosive lichen planus of the vulva on its prognosis.

Cooper and Wojnarowska 2006 · Cooper Susan M, Wojnarowska Fenella · Archives of dermatology · 2006

Included by

Malignant Transformation in Extraoral Lichen Planus: A Systematic Review and Meta-Analysis in the Context of the Risk in Oral Lichen Planus.

Non-Cochrane · prognostic · 2026 · cited as Cooper 2006 · References 16-25; Figure 3a

Outcome this study informs	Pooled effect	Evidence	Certainty
Malignant transformation (proportion of patients developing cancer) Presence of extraoral lichen planus (exposure) vs Not applicable · Follow-up as reported by each study	Pooled proportion 0.02 [0.01, 0.04]	7 studies · 2575 participants	GRADE not reported
Malignant transformation (proportion of patients developing cancer) Presence of extraoral lichen planus (exposure) vs Not applicable · Follow-up as reported by each study	Pooled proportion 0.01 [0.00, 0.03]	8 studies · 15675 participants	GRADE not reported
Malignant transformation (proportion of patients developing cancer) Presence of extraoral lichen planus (exposure) vs Not applicable · Follow-up as reported by each study	Pooled proportion 0.02 [0.02, 0.03]	6 studies · 504 participants	GRADE not reported

1 including review in total.