Pityriasis lichenoides chronica

L12_PARAPSO_PITYLICHCHRON

parapsoriasis: one of a group of skin disorders that are characterized primarily by their resemblance to psoriasis (red, scaly lesions), rather than by their underlying etiology. Neoplasms can develop from parapsoriasis. For example, it can develop into cutaneous T-cell lymphoma.

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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 L41.1
  • Hospital discharge: ICD-9 6962B
  • Cause of death: ICD-10 L41.1
  • Cause of death: ICD-9 6962B

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

138

4. Check minimum number of events

None

138

5. Include endpoints

None

138

6. Filter based on genotype QC (FinnGen only)

138

Control definitions (FinnGen only)

Control exclude
L12_PAPULOSQUAMOUS

Extra metadata

Level in the ICD hierarchy
4
First used in FinnGen datafreeze
DF2
Parent code in ICD-10
L41
Name in latin
Pityriasis lichenoides chronica

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 1094 573 516
Only index persons 1012 541 471
Unadjusted period prevalence (%)
Whole population 0.02 0.02 0.01
Only index persons 0.02 0.02 0.02
Median age at first event (years)
Whole population 47.37 51.09 43.22
Only index persons 46.68 50.15 42.71

-FinnGen-

Key figures

All Female Male
Number of individuals 138 69 69
Unadjusted period prevalence (%) 0.03 0.02 0.03
Median age at first event (years) 55.49 52.79 58.20

-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
126
Matched controls
1260
Code
Vocabulary
Description
Odds Ratio
-log10(p)
N matched cases
N matched controls
L41.1
ICD-10 Finland
Pityriasis lichenoides chronica
+∞
170.9
122
*
TQX10
NOMESCO Finland
Biopsy of skin and subcutaneous tissue
20.7
38.8
62
56
E0000UV
ATC
NA
6.6
21.6
89
336
L30.9
ICD-10 Finland
Dermatitis, unspecified
7.5
20.5
57
125
D07AB02
ATC
hydrocortisone butyrate; topical
6.0
19.1
70
217
D07AC01
ATC
betamethasone; topical
5.5
17.9
75
266
D07AB08
ATC
desonide; topical
8.0
15.8
38
64
WXQ27
NOMESCO Finland
UVB narrow spectrum light therapy
84.2
13.9
15
*
D07AC13
ATC
mometasone; topical
4.5
13.7
63
227
D07AD01
ATC
clobetasol; topical
6.1
13.7
41
92
E000001
ATC
NA
4.7
12.1
48
146
L41.4
ICD-10 Finland
Large plaque parapsoriasis
+∞
11.6
11
*
L40.0
ICD-10 Finland
Psoriasis vulgaris
47.9
11.1
13
*
E000002
ATC
NA
5.6
10.2
31
69
D07BA04
ATC
hydrocortisone and antiseptics; topical
5.8
9.9
29
62
L41.0
ICD-10 Finland
Pityriasis lichenoides et varioliformis acuta
+∞
8.4
8
*
XQ848
NOMESCO Finland
Dermatological photography
15.9
8.4
13
9
D07AA02
ATC
hydrocortisone; topical
4.3
8.1
31
88
D02AE01
ATC
carbamide; topical
6.4
7.8
20
36
E000007
ATC
NA
7.8
7.3
16
23
D09AB01
ATC
zinc bandage without supplements; topical
17.9
6.9
10
6
D07BB04
ATC
hydrocortisone butyrate and antiseptics; topical
3.7
6.6
29
93
L43.8
ICD-10 Finland
Other lichen planus
73.4
6.5
7
*

Mortality – FinRegistry

Association

Association between endpoint L12_PARAPSO_PITYLICHCHRON and mortality.

Females

No data

Males

Parameter HR [95% CI] p-value
L12_PARAPSO_PITYLICHCHRON 1.103 [0.81, 1.5] 0.535
Birth year 0.986 [0.98, 1.0] 0.004

During the follow-up period (1.1.1998 — 31.12.2019), 59 out of 434 males with L12_PARAPSO_PITYLICHCHRON died.

Mortality risk

Mortality risk for people of age

years, who have L12_PARAPSO_PITYLICHCHRON.

N-year risk Females Males
1 No data 0.262%
5 No data 1.381%
10 No data 3.296%
15 No data 5.941%
20 No data 10.029%

Relationships between endpoints

Index endpoint: L12_PARAPSO_PITYLICHCHRON – Pityriasis lichenoides chronica

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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