Donald Thomas, MD, FACP, FACR
Arthritis and Pain Associates of PG County
Assistant Professor of Medicine
Uniformed Services University of the Health Sciences, Bethesda
photo credit: africanleadershipacademy.org
-

LUPUS
Women of childbearing
age
More severe dz in
younger patients
1/200 African American
women of child bearing
age
-

-

LUPUS
Women of childbearing
age
More severe dz in
younger patients
1/200 African American
women of child bearing
age
“Invisible disease”
Average of 4-6 years
before diagnosis
-

-

LUPUS
Women of childbearing
age
More severe dz in
younger patients
1/200 African American
women of child bearing
age
“Invisible disease”
Average of 4-6 years
before diagnosis

- 5-10% die within

10 years of dx
Whitney
-

24 yo
-

Whitney
Born 12/14/88
Died 2/20/13 from SLE

photo credit: facebook.com/Lupus –Wall- Remembering- those- who- have- lost- their- Battle
- 95% of patients live 10 years or longer
- Most patients live a long normal life with proper treatment
- Best prognosis:
-

Early diagnosis
Proper medical care (doctors, medications, tests, educated)

photo credit: sometimesitslupus.com
- New “classification criteria” for systemic lupus
- What labs to order for lupus workup
- Correction of lupus triggers
-

Low vit D, UV light, smoking, sulfa antibiotics

- Ensure vaccines are obtained
- Resources to recommend to college students with lupus
- 4 out of 14 criteria = SLE
- Classification criteria = for research purposes only
-

Not recommended for diagnostic purposes

- 2004: embarked upon revision
- Missing in 1982 criteria
Low complements
Antiphospholipid antibodies

-

- 1982 weighted towards cutaneous dz (4 of 14 criteria)
Excluded biopsy proven lupus nephritis as sole manifestation
Neuro lupus only included psychosis and seizures

-

-

-

ACR lists 18 potential neurologic disorders in neuropsychiatric lupus

Could only use one type of low blood count

- LE cell prep no longer used
- Diagnosed SLE patients vs those meeting classification
Many patients with early SLE didn’t meet criteria
By the time they do they are:

-

Older
Had established disease longer
More end-organ damage
- SLE occurs if
-

Biopsy proven lupus nephritis + ANA or dsDNA

- OR
-

-

4 out of 17 criteria
At least 1 from “Clinical Criteria” and from “Immunologic Criteria”
-

Renal
Alopecia, nonscarring
Serositis
Hemolytic anemia

-

Oral and nasal ulcers
Neurologic

-

Synovitis
Chronic cutaneous lupus (discoid)
Acute and subacute cutaneous lupus
Leucopenia/lymphopenia
Platelets, low
- Random urine protein/creatinine ratio ≥ 0.500
- 25 hour urine protein ≥500 mg protein/24 hours
- Red blood cell casts on urine microscopy

photo credit: studyblue.com
- Diffuse thinning
- Hair fragility, broken hair
- “Lupus hair”
- Rule out alopecia areata, drugs, iron deficiency, androgenic

alopecia
- Grows back

CellCept
- Pleuritis
-

“Typical pleurisy” > 1 day
Pleural effusions
Pleural rub

- Pericarditis
-

“Typical pericardial pain” > 1 day (worse with lying, better sitting forward)
Pericardial effusion
Pericardial rub
+ ECG

Photo credit: clinicalcases.org
- Direct Coombs antibody positive
- High reticulocyte count
- Low haptoglobin
- Increased indirect bilirubin

Photo credit: commons.wikipedia.org
- Oral ulcers
-

Palate, buccal, tongue
Often painless

- Nasal ulcers

- Rule out:
-

-

Vasculitis
Behçet’s disease
Infections (HSV)
Inflammatory bowel disease
Reactive arthritis

Photo credit: de.wikipedia.org
- Seizures
- Psychosis
- Mononeuritis multiplex
-

in absence of a 1° vasculitis

- Myelitis
- Peripheral or Cranial neuropathy
-

R/o diabetes, infection (Lyme), 1° vasculitis

- Acute confusional state
-

R/o toxic, metabolic, uremia, infection, drugs

Photo credit: en.wikipedia.org
- ≥ 2 joints
-

Swelling or effusion OR
Tender joints + AM stiffness ≥ 30 minutes

Photo credit: cdaarthritis.com
- Discoid lupus
- Hypertrophic (verrucous) lupus
- Lupus panniculitis (profundus)
- Discoid lupus/lichen planus overlap

- Lupus erythematosus tumidus
- Chilblains lupus
- Mucosal lupus

Photo credit: entindia.info
- Malar rash (don’t count discoid)
- Toxic necrolysis variant of SLE
- Maculopapular lupus rash
- Photosensitive lupus rash

- Bullous lupus

- SCLE:
-

Non-indurated psoriasiform
Annular polycyclic

Photo credit: globalskinatlas.com
- WBC < 4000/mm3 (once)
-

R/o Felty’s syndrome, drugs, portal hypertension

- Lymphs < 1000/mm3 (once)
-

R/o steroids, drugs, infections (virus)
- Platelets< 100,000 (once)
-

R/o TTP, drugs, portal hypertension
- ANA
- Anti-ds DNA
- Antiphospholipid antibodies
-

-

Lupus anticoagulant
False positive RPR
Anticardiolipin antibody
Beta-2 glycoprotein antibody

- Low complements (C3, C4, CH50)
- Direct Coombs’ test (in absence of hemolytic anemia)
- Out of 702 patient scenarios……….
- Misclassified patients: 7% vs 10%
- Sensitivity: 94% vs 86%
- Specificity: 92% vs 93% (not statistically different)
“… if you use the
classification criteria to
diagnose SLE... I
promise not to tell
anyone.”

Michelle Petri, MD: Medical Director Lupus Clinic
Johns Hopkins
-

Renal (proteinuria)
Alopecia
Serositis (pleuritic chest pain)
Hemolytic anemia (all low blood counts)

-

Oral and nasal ulcers
Neurologic problems

-

Synovitis (joint pains)
Chronic cutaneous lupus (discoid)
Acute cutaneous lupus (malar rash, rash with sun exposure)
Leukopenia/lymphopenia and Platelets, low

-

Blood clots
Raynaud’s phenomenon
- Basic/Initial
-

ANA by IFA (indirect fluorescence assay)

-

CBC
Urinalysis with reflex microscopy
Random urine protein/creatine ratio
ESR, CRP, SPEP
25-OH vitamin D

-

-

- If pleuritic chest pain
-

CXR
ECG
Echocardiogram
- If positive ANA by IFA
ds-DNA
ENA (Smith, RNP)
Sjögren's panel (SSA/SSB)
Ribosomal-P antibody
C3, C4, CH50 complements
Direct Coombs’ test
Antiphospholipid antibodies

-

-

RPR with reflex FTA
Anticardiolipin antibodies (IgM, IgG, IgA)
Lupus anticoagulant
Beta-2 glycoprotein I antibodies (IgM, IgG, IgA)

- Inflammatory arthritis:
-

CPK, RF, CCP, Lyme, HLA-B27, ASO, IgM Parvovirus
- Low vitamin D levels
- UV light
- Smoking
- Sulfa antibiotics
- White blood cell membranes have Vit D receptors
- Higher prevalence of low Vit D in SLE patients
- More severe SLE at presentation associated with lower Vit D
- Lower Vit D levels occur during SLE flares

- Low vitamin D correlated with flares
- Petri M et al, Vitamin D and SLE, Arthr & Rheum;65(7):1865-71
1006 patients, 128 weeks
25[OH]D < 40 ng/mL
TX = 50,000 IU ergocalciferol (vit D2) + daily calcium with 200 IU vit D3

-

- Results:
- ≥ 20 ng/mL increase 25[OH]D associated with:

-

.22 decrease in SELENA/SLEDAI (P = .032)
21% decrease in having a SELENA/SLEDAI ≥ 5
Random urine/protein decreased by 2% (P = .0001)
15% decrease in odds of having urine/prot > .5
- Treat patients with 25[OH]D < 40 ng/mL
- Aim for a level of around 40 ng/mL or higher
Ultraviolet light
Ultraviolet light

Skin

NUCLEUS

cell
Ultraviolet light

Skin

NUCLEUS

cell

damage

cell
NUCLEUS
Ultraviolet light

Skin

NUCLEUS

cell

Antinuclear antibodies
Cause increased lupus activity
X 15 minutes

Dose of UV light = Strength X Time
X 15 minutes

Dose of UV light = Strength X Time
X all day long
- Wear sunscreen daily even if don’t go outside
- Reapply if go outside
- Use sunscreen vs UVA and UVB + waterproof + high SPF
- Wide brimmed hat

- UV protectant clothes
- Add Rit Sunguard to wash
- Avoid outside 10 AM – 3 PM
- Tobacco contains hydrazine
-

Hydrazine known to increase lupus activity

- Smoking decreases effectiveness of Plaquenil
- Smoking is associated with increased lupus prevalence

- Smoking associated with more severe lupus
- Increased risk for lupus flares
- Ask patients to include Bactrim and Septra in allergies
- Make sure all patients get

yearly flu shot
- Dreyer L et al, High Incidence of Potentially Virus-Induced

Malignancies in SLE, Arth & Rheum, 2011;63(10):3032-37
Increased HPV-associated cancers

-

Anal cancer
Vulvovaginal
Cervical
Non-melanoma skin cancer

- Nath R et al, High risk of Human Papillomavirus Type-16 infections

and of development of squamous intraepithelial lesions in
systemic lupus erythematosus patients, A&R, 2007;57(4):619-25
-

High levels of HPV-16 infection and abnormal colposcopy in newly
diagnosed SLE women
photo credit: beasleyallen.com
- Lupus Foundation of America DC/MD/VA chapter
Patient Navigator service
www.lupus.org/dmv
888-787-5380

-

- “Lupus Secrets” handout (last page)
- Social Media:
Facebook: Lupus Encyclopedia

-

-

-

www.facebook.com/LupusEncyclopedia
Daily tips and facts about lupus
I answer questions posted by patients

Numerous Facebook patient support groups
- SLICC new SLE classification criteria
-

-

4 out of 17
at least 1 from “clinical” and 1 from “immunologic”

- Basic initial workup: ANA, CBC, UA
-

Do additional labs if ANA+
Refer to rheumatologist ASAP

- Begin tx: Vitamin D, Sunscreen, no cigarettes
- Vaccines:
-

Annual flu shot
Gardasil series

- Resources are available
photo credit: customink.com
References 1:
 Agmon-Levin N et al. International recommendations for

the assessment of autoantibodies to cellular antigens
referred to as anti-nuclear antibodies. Ann Rheum Dis.
2014;73:17-23
 Amital H et al. Serum concentration of 25-OH vitamin D in
patients with SLE are inversely related to disease activity.
Ann Rheum Dis.2010,69:1155-57.
 Birmingham DJ et al. Evidence that abnormally large
seasonal declines in vitamin D status may trigger SLE flare
in non-African Americans. Lupus. 2012;21(8):855-64
 Bonakdar ZS et al. Vitamin D deficiency and its association
with disease activity in new cases of systemic lupus
erythematosus. Lupus.2011;20:1155-60
References 2:
 Boeckler P et al. Association of cigarette smoking but

not alcohol consumption with cutaneous lupus
erythematosus. Arch of Derm. 2009;145(9):1012-16
 Cooper G et al. Occupational and environmental
exposures and risk of systemic lupus erythematosus:
silica, sunlight, solvents. Rheum (Oxford).
2010;49(11):2172-80
 Dreyer L et al. High incidence of potentially virusinduced malignancies in systemic lupus
erythematosus. Arth & Rheum. 2011;63(10):3032-37
References 3:
 Ghaussy NO et al. Cigarette smoking and disease

activity in systemic lupus erythematosus. J of Rheum.
2003;30:1215-21
 Isenberg DA et al. The Systemic Lupus International
Collaborating Clinics (SLICC) group – It was 20 years
ago today. Lupus. 2011;20:1426-32
 Mok CC et al. Vitamin D deficiency as marker for
disease activity and damage in systemic lupus
erythematosus. Lupus. 2012;21:36-42
References 4:
 Nath Ret al. High risk of human papilloma virus type

16 infections and of development of cervical squamous
intraepithelial lesions in systemic lupus erythematosus
patients. Arth & Rheum. 2007;57(4):619-25
 Petri M et al. Vitamin D in SLE. Arth & Rheum.
2013;65(7):1865-71
 Petri M et al. Derivation and validation of the systemic
Lupus International Collaborating Clinics
classification criteria for SLE. Arthr & Rheum.
2012:2677-86
References 5:
 Petri M & Magder L. Classification criteria for SLE.

Lupus. 2004;13:829-37
 Pons-Estel GJ et al. The ACR and the SLICC criteria for
SLE in two multiethnic cohorts. Lupus. 2014;23:3-9
 Rahman P et al. Smoking interferes with efficacy of
antimalarial therapy in cutaneous lupus. J of Rheum.
1998;25:1716-19
 Ruiz-Irastorza G et al. Changes in vitamin D levels in
patients with SLE. Arthr Care & Research.
2010;62(8):1160-65

Lupus update for Primary Care Providers 2014

  • 1.
    Donald Thomas, MD,FACP, FACR Arthritis and Pain Associates of PG County Assistant Professor of Medicine Uniformed Services University of the Health Sciences, Bethesda
  • 2.
  • 3.
    - LUPUS Women of childbearing age Moresevere dz in younger patients 1/200 African American women of child bearing age
  • 4.
    - - LUPUS Women of childbearing age Moresevere dz in younger patients 1/200 African American women of child bearing age “Invisible disease” Average of 4-6 years before diagnosis
  • 5.
    - - LUPUS Women of childbearing age Moresevere dz in younger patients 1/200 African American women of child bearing age “Invisible disease” Average of 4-6 years before diagnosis - 5-10% die within 10 years of dx
  • 6.
  • 7.
    - Whitney Born 12/14/88 Died 2/20/13from SLE photo credit: facebook.com/Lupus –Wall- Remembering- those- who- have- lost- their- Battle
  • 8.
    - 95% ofpatients live 10 years or longer - Most patients live a long normal life with proper treatment - Best prognosis: - Early diagnosis Proper medical care (doctors, medications, tests, educated) photo credit: sometimesitslupus.com
  • 9.
    - New “classificationcriteria” for systemic lupus - What labs to order for lupus workup - Correction of lupus triggers - Low vit D, UV light, smoking, sulfa antibiotics - Ensure vaccines are obtained - Resources to recommend to college students with lupus
  • 10.
    - 4 outof 14 criteria = SLE - Classification criteria = for research purposes only - Not recommended for diagnostic purposes - 2004: embarked upon revision
  • 11.
    - Missing in1982 criteria Low complements Antiphospholipid antibodies - - 1982 weighted towards cutaneous dz (4 of 14 criteria) Excluded biopsy proven lupus nephritis as sole manifestation Neuro lupus only included psychosis and seizures - - - ACR lists 18 potential neurologic disorders in neuropsychiatric lupus Could only use one type of low blood count - LE cell prep no longer used
  • 12.
    - Diagnosed SLEpatients vs those meeting classification Many patients with early SLE didn’t meet criteria By the time they do they are: - Older Had established disease longer More end-organ damage
  • 13.
    - SLE occursif - Biopsy proven lupus nephritis + ANA or dsDNA - OR - - 4 out of 17 criteria At least 1 from “Clinical Criteria” and from “Immunologic Criteria”
  • 14.
    - Renal Alopecia, nonscarring Serositis Hemolytic anemia - Oraland nasal ulcers Neurologic - Synovitis Chronic cutaneous lupus (discoid) Acute and subacute cutaneous lupus Leucopenia/lymphopenia Platelets, low
  • 15.
    - Random urineprotein/creatinine ratio ≥ 0.500 - 25 hour urine protein ≥500 mg protein/24 hours - Red blood cell casts on urine microscopy photo credit: studyblue.com
  • 16.
    - Diffuse thinning -Hair fragility, broken hair - “Lupus hair” - Rule out alopecia areata, drugs, iron deficiency, androgenic alopecia - Grows back CellCept
  • 17.
    - Pleuritis - “Typical pleurisy”> 1 day Pleural effusions Pleural rub - Pericarditis - “Typical pericardial pain” > 1 day (worse with lying, better sitting forward) Pericardial effusion Pericardial rub + ECG Photo credit: clinicalcases.org
  • 18.
    - Direct Coombsantibody positive - High reticulocyte count - Low haptoglobin - Increased indirect bilirubin Photo credit: commons.wikipedia.org
  • 19.
    - Oral ulcers - Palate,buccal, tongue Often painless - Nasal ulcers - Rule out: - - Vasculitis Behçet’s disease Infections (HSV) Inflammatory bowel disease Reactive arthritis Photo credit: de.wikipedia.org
  • 20.
    - Seizures - Psychosis -Mononeuritis multiplex - in absence of a 1° vasculitis - Myelitis - Peripheral or Cranial neuropathy - R/o diabetes, infection (Lyme), 1° vasculitis - Acute confusional state - R/o toxic, metabolic, uremia, infection, drugs Photo credit: en.wikipedia.org
  • 21.
    - ≥ 2joints - Swelling or effusion OR Tender joints + AM stiffness ≥ 30 minutes Photo credit: cdaarthritis.com
  • 22.
    - Discoid lupus -Hypertrophic (verrucous) lupus - Lupus panniculitis (profundus) - Discoid lupus/lichen planus overlap - Lupus erythematosus tumidus - Chilblains lupus - Mucosal lupus Photo credit: entindia.info
  • 23.
    - Malar rash(don’t count discoid) - Toxic necrolysis variant of SLE - Maculopapular lupus rash - Photosensitive lupus rash - Bullous lupus - SCLE: - Non-indurated psoriasiform Annular polycyclic Photo credit: globalskinatlas.com
  • 24.
    - WBC <4000/mm3 (once) - R/o Felty’s syndrome, drugs, portal hypertension - Lymphs < 1000/mm3 (once) - R/o steroids, drugs, infections (virus)
  • 25.
    - Platelets< 100,000(once) - R/o TTP, drugs, portal hypertension
  • 26.
    - ANA - Anti-dsDNA - Antiphospholipid antibodies - - Lupus anticoagulant False positive RPR Anticardiolipin antibody Beta-2 glycoprotein antibody - Low complements (C3, C4, CH50) - Direct Coombs’ test (in absence of hemolytic anemia)
  • 27.
    - Out of702 patient scenarios………. - Misclassified patients: 7% vs 10% - Sensitivity: 94% vs 86% - Specificity: 92% vs 93% (not statistically different)
  • 28.
    “… if youuse the classification criteria to diagnose SLE... I promise not to tell anyone.” Michelle Petri, MD: Medical Director Lupus Clinic Johns Hopkins
  • 29.
    - Renal (proteinuria) Alopecia Serositis (pleuriticchest pain) Hemolytic anemia (all low blood counts) - Oral and nasal ulcers Neurologic problems - Synovitis (joint pains) Chronic cutaneous lupus (discoid) Acute cutaneous lupus (malar rash, rash with sun exposure) Leukopenia/lymphopenia and Platelets, low - Blood clots Raynaud’s phenomenon
  • 30.
    - Basic/Initial - ANA byIFA (indirect fluorescence assay) - CBC Urinalysis with reflex microscopy Random urine protein/creatine ratio ESR, CRP, SPEP 25-OH vitamin D - - - If pleuritic chest pain - CXR ECG Echocardiogram
  • 31.
    - If positiveANA by IFA ds-DNA ENA (Smith, RNP) Sjögren's panel (SSA/SSB) Ribosomal-P antibody C3, C4, CH50 complements Direct Coombs’ test Antiphospholipid antibodies - - RPR with reflex FTA Anticardiolipin antibodies (IgM, IgG, IgA) Lupus anticoagulant Beta-2 glycoprotein I antibodies (IgM, IgG, IgA) - Inflammatory arthritis: - CPK, RF, CCP, Lyme, HLA-B27, ASO, IgM Parvovirus
  • 32.
    - Low vitaminD levels - UV light - Smoking - Sulfa antibiotics
  • 33.
    - White bloodcell membranes have Vit D receptors - Higher prevalence of low Vit D in SLE patients - More severe SLE at presentation associated with lower Vit D - Lower Vit D levels occur during SLE flares - Low vitamin D correlated with flares
  • 34.
    - Petri Met al, Vitamin D and SLE, Arthr & Rheum;65(7):1865-71 1006 patients, 128 weeks 25[OH]D < 40 ng/mL TX = 50,000 IU ergocalciferol (vit D2) + daily calcium with 200 IU vit D3 - - Results: - ≥ 20 ng/mL increase 25[OH]D associated with: - .22 decrease in SELENA/SLEDAI (P = .032) 21% decrease in having a SELENA/SLEDAI ≥ 5 Random urine/protein decreased by 2% (P = .0001) 15% decrease in odds of having urine/prot > .5
  • 35.
    - Treat patientswith 25[OH]D < 40 ng/mL - Aim for a level of around 40 ng/mL or higher
  • 36.
  • 37.
  • 38.
  • 39.
  • 40.
    X 15 minutes Doseof UV light = Strength X Time
  • 41.
    X 15 minutes Doseof UV light = Strength X Time X all day long
  • 42.
    - Wear sunscreendaily even if don’t go outside - Reapply if go outside - Use sunscreen vs UVA and UVB + waterproof + high SPF - Wide brimmed hat - UV protectant clothes - Add Rit Sunguard to wash - Avoid outside 10 AM – 3 PM
  • 43.
    - Tobacco containshydrazine - Hydrazine known to increase lupus activity - Smoking decreases effectiveness of Plaquenil - Smoking is associated with increased lupus prevalence - Smoking associated with more severe lupus
  • 44.
    - Increased riskfor lupus flares - Ask patients to include Bactrim and Septra in allergies
  • 45.
    - Make sureall patients get yearly flu shot
  • 46.
    - Dreyer Let al, High Incidence of Potentially Virus-Induced Malignancies in SLE, Arth & Rheum, 2011;63(10):3032-37 Increased HPV-associated cancers - Anal cancer Vulvovaginal Cervical Non-melanoma skin cancer - Nath R et al, High risk of Human Papillomavirus Type-16 infections and of development of squamous intraepithelial lesions in systemic lupus erythematosus patients, A&R, 2007;57(4):619-25 - High levels of HPV-16 infection and abnormal colposcopy in newly diagnosed SLE women
  • 47.
  • 48.
    - Lupus Foundationof America DC/MD/VA chapter Patient Navigator service www.lupus.org/dmv 888-787-5380 - - “Lupus Secrets” handout (last page) - Social Media: Facebook: Lupus Encyclopedia - - - www.facebook.com/LupusEncyclopedia Daily tips and facts about lupus I answer questions posted by patients Numerous Facebook patient support groups
  • 49.
    - SLICC newSLE classification criteria - - 4 out of 17 at least 1 from “clinical” and 1 from “immunologic” - Basic initial workup: ANA, CBC, UA - Do additional labs if ANA+ Refer to rheumatologist ASAP - Begin tx: Vitamin D, Sunscreen, no cigarettes - Vaccines: - Annual flu shot Gardasil series - Resources are available
  • 50.
  • 51.
    References 1:  Agmon-LevinN et al. International recommendations for the assessment of autoantibodies to cellular antigens referred to as anti-nuclear antibodies. Ann Rheum Dis. 2014;73:17-23  Amital H et al. Serum concentration of 25-OH vitamin D in patients with SLE are inversely related to disease activity. Ann Rheum Dis.2010,69:1155-57.  Birmingham DJ et al. Evidence that abnormally large seasonal declines in vitamin D status may trigger SLE flare in non-African Americans. Lupus. 2012;21(8):855-64  Bonakdar ZS et al. Vitamin D deficiency and its association with disease activity in new cases of systemic lupus erythematosus. Lupus.2011;20:1155-60
  • 52.
    References 2:  BoecklerP et al. Association of cigarette smoking but not alcohol consumption with cutaneous lupus erythematosus. Arch of Derm. 2009;145(9):1012-16  Cooper G et al. Occupational and environmental exposures and risk of systemic lupus erythematosus: silica, sunlight, solvents. Rheum (Oxford). 2010;49(11):2172-80  Dreyer L et al. High incidence of potentially virusinduced malignancies in systemic lupus erythematosus. Arth & Rheum. 2011;63(10):3032-37
  • 53.
    References 3:  GhaussyNO et al. Cigarette smoking and disease activity in systemic lupus erythematosus. J of Rheum. 2003;30:1215-21  Isenberg DA et al. The Systemic Lupus International Collaborating Clinics (SLICC) group – It was 20 years ago today. Lupus. 2011;20:1426-32  Mok CC et al. Vitamin D deficiency as marker for disease activity and damage in systemic lupus erythematosus. Lupus. 2012;21:36-42
  • 54.
    References 4:  NathRet al. High risk of human papilloma virus type 16 infections and of development of cervical squamous intraepithelial lesions in systemic lupus erythematosus patients. Arth & Rheum. 2007;57(4):619-25  Petri M et al. Vitamin D in SLE. Arth & Rheum. 2013;65(7):1865-71  Petri M et al. Derivation and validation of the systemic Lupus International Collaborating Clinics classification criteria for SLE. Arthr & Rheum. 2012:2677-86
  • 55.
    References 5:  PetriM & Magder L. Classification criteria for SLE. Lupus. 2004;13:829-37  Pons-Estel GJ et al. The ACR and the SLICC criteria for SLE in two multiethnic cohorts. Lupus. 2014;23:3-9  Rahman P et al. Smoking interferes with efficacy of antimalarial therapy in cutaneous lupus. J of Rheum. 1998;25:1716-19  Ruiz-Irastorza G et al. Changes in vitamin D levels in patients with SLE. Arthr Care & Research. 2010;62(8):1160-65