Cicatricial alopecia [scarring hair loss]

L12_HAIRLOSSSCAR

Endpoint definition

Endpoint definition steps

FinnGen

Phenotype data

520210

1. Apply sex-specific rule

None

520210

2. Check conditions

None

520210

3. Check pre-conditions, main-only, mode, registry filters

Registry filters:

  • Hospital discharge: ICD-10 L66
  • Cause of death: ICD-10 L66

2 out of 7 registries used, show all original rules.

228

4. Check minimum number of events

None

228

5. Include endpoints

266

6. Filter based on genotype QC (FinnGen only)

266

Control definitions (FinnGen only)

Control exclude
L12_DISORDSKINAPPENDIX

Extra metadata

Level in the ICD hierarchy
3
First used in FinnGen datafreeze
DF2
Parent code in ICD-10
L60-L75
Name in latin
Alopecia cicatrisans

Case counts by codes

FinnGen case counts by registry codes:

generic upset plot

Upset plot

Full data table

Summary Statistics

-FinRegistry-

Key figures

All Female Male
Number of individuals
Whole population 1938 1201 729
Only index persons 1789 1155 634
Unadjusted period prevalence (%)
Whole population 0.03 0.03 0.02
Only index persons 0.04 0.04 0.02
Median age at first event (years)
Whole population 48.69 56.69 35.57
Only index persons 48.37 56.89 32.84

-FinnGen-

Key figures

All Female Male
Number of individuals 266 199 67
Unadjusted period prevalence (%) 0.06 0.07 0.03
Median age at first event (years) 54.51 58.16 43.65

-FinRegistry-

Age distribution of first events

-FinnGen-

Age distribution of first events

-FinRegistry-

Year distribution of first events

-FinnGen-

Year distribution of first events

-FinRegistry-

Cumulative Incidence Function

-FinnGen-

Cumulative Incidence Function

No data

CodeWAS (R11)

CodeWAS is a tool for exploring the associations between an endpoint and all of the medical codes and drug codes.

This is a new tool, please reach out using the contact form for feedback and improvement ideas.

First, a cohort is built by matching controls to the endpoint cases using year of birth and sex. Then, a Fisher test is done for all the medical codes and drug codes between the cases and controls of this cohort. Codes are reported in the table below if they have −log10(p-value) ≥ 6.

Matched cohort

Matched cases
233
Matched controls
2330
Code
Vocabulary
Description
Odds Ratio
-log10(p)
N matched cases
N matched controls
L66.1
ICD-10 Finland
Lichen planopilaris
+∞
96.8
86
*
L66.9
ICD-10 Finland
Cicatricial alopecia, unspecified
+∞
55.5
51
*
D07AD01
ATC
clobetasol; topical
9.7
50.8
129
265
TQX10
NOMESCO Finland
Biopsy of skin and subcutaneous tissue
11.4
41.3
85
112
70404
ICD-8 Finland
Diseases of hair and hair follicles, Folliculitis NUD
+∞
36.4
34
*
L66.2
ICD-10 Finland
Folliculitis decalvans
+∞
33.1
31
*
L66.8
ICD-10 Finland
Other cicatricial alopecia
+∞
33.1
31
*
P01BA02
ATC
hydroxychloroquine; oral
7.9
29.4
74
129
D07AC01
ATC
betamethasone; topical
4.2
23.5
134
566
L66.0
ICD-10 Finland
Pseudopelade
+∞
19.0
18
*
L30.9
ICD-10 Finland
Dermatitis, unspecified
3.7
14.1
71
247
D07AC13
ATC
mometasone; topical
3.1
13.8
101
463
L43.8
ICD-10 Finland
Other lichen planus
12.6
13.7
24
21
J01AA04
ATC
lymecycline; systemic
4.4
13.5
52
142
D07XC01
ATC
betamethasone, combinations; topical
4.1
13.1
55
162
E0000UV
ATC
NA
2.8
12.5
123
668
L63.9
ICD-10 Finland
Alopecia areata, unspecified
+∞
11.6
11
*
D10BA01
ATC
isotretinoin; oral
7.1
11.5
28
44
D07AB02
ATC
hydrocortisone butyrate; topical
2.7
10.9
95
468
L66.4
ICD-10 Finland
Folliculitis ulerythematosa reticulata
+∞
10.5
10
*
QAA05
NOMESCO Finland
Incision for biopsy of skin of head or neck
12.1
10.2
18
16
L71.8
ICD-10 Finland
Other rosacea
57.4
9.7
11
*
H04.10
ICD-10 Finland
Dry eye syndrome
3.9
9.6
41
122
XQ848
NOMESCO Finland
Dermatological photography
8.9
9.3
19
23
L21.8
ICD-10 Finland
Other seborrhoeic dermatitis
25.2
9.0
12
5
L43.9
ICD-10 Finland
Lichen planus, unspecified
9.6
8.7
17
19
L93.0
ICD-10 Finland
Discoid lupus erythematosus
28.7
8.6
11
*
L71.9
ICD-10 Finland
Rosacea, unspecified
11.4
7.4
13
12
R21
ICD-10 Finland
Rash and other nonspecific skin eruption
5.7
7.3
20
38
L73.8
ICD-10 Finland
Other specified follicular disorders
+∞
6.3
6
*
69100
ICD-8 Finland
Infantile eczema and related conditions, Eczema atopicum. Prurigo Besnier. Eczema pruriginosum allergicum
13.0
6.1
10
8
D05BB02
ATC
acitretin; oral
5.8
6.1
16
29

Mortality – FinRegistry

Association

Association between endpoint L12_HAIRLOSSSCAR and mortality.

Females

Parameter HR [95% CI] p-value
L12_HAIRLOSSSCAR 1.016 [0.78, 1.33] 0.91
Birth year 0.996 [0.99, 1.0] 0.377

During the follow-up period (1.1.1998 — 31.12.2019), 71 out of 867 females with L12_HAIRLOSSSCAR died.

Males

No data

Mortality risk

Mortality risk for people of age

years, who have L12_HAIRLOSSSCAR.

N-year risk Females Males
1 0.114% No data
5 0.624% No data
10 1.506% No data
15 3.054% No data
20 5.469% No data

Relationships between endpoints

Index endpoint: L12_HAIRLOSSSCAR – Cicatricial alopecia [scarring hair loss]

GWS hits: -

Endpoint
Case Overlap
Survival Analysis
Genetic Correlations
Genetic Signals
N (Jaccard index)
HR [CI]
Extremity
rg [CI]
Extremity
Hits
Coloc Hits
FinRegistry
FinnGen
FinRegistry
FinnGen
FinnGen
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