evidencegaps
Primary study · included by 1 review

Lichen planus and malignancy. An epidemiologic study of 2071 patients and a review of the literature.

Sigurgeirsson and Lindelof 1991 · Sigurgeirsson B, Lindelöf B · Archives of dermatology · 1991

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 Sigurgeirsson 1991 · References 16-25; Figure 3a
Outcome this study informsPooled effectEvidenceCertainty
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 participantsGRADE 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 participantsGRADE 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 participantsGRADE not reported

1 including review in total.