Chronic autoimmune exocrinopathy producing keratoconjunctivitis sicca and xerostomia.
Also known as: Sjogren syndrome, Sjögren syndrome, primary Sjögren, sicca syndrome
Overview
A chronic systemic autoimmune disease characterized by lymphocytic infiltration of exocrine glands, producing dry eyes (keratoconjunctivitis sicca) and dry mouth (xerostomia), with frequent extraglandular involvement. Primary Sjögren occurs in isolation; secondary Sjögren accompanies another autoimmune disease, most commonly rheumatoid arthritis, SLE, or systemic sclerosis.
Epidemiology
Estimated prevalence 0.5-1.0 percent. Female-to-male ratio approximately 9:1. Peak onset in the fifth and sixth decades.
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Viral exposure has been implicated (Epstein-Barr virus, hepatitis C, HTLV-1) but not firmly established
Pathophysiology
Lymphocytic (predominantly CD4+ T-cell and B-cell) infiltration of exocrine glands disrupts secretion. B-cell hyperactivity produces hypergammaglobulinemia and characteristic autoantibodies (anti-SSA/Ro and anti-SSB/La). Chronic glandular inflammation may evolve into lymphoma, particularly mucosa-associated lymphoid tissue (MALT) lymphoma of the parotid.
Middle-aged woman with progressive ocular and oral dryness, bilateral parotid enlargement, positive anti-SSA/Ro and anti-SSB/La antibodies, and dental caries.
Differential diagnosis
Age-related sicca — Mild dryness without systemic symptoms, normal labs, normal salivary gland biopsy
Medication-induced dryness — Anticholinergics, antihistamines, antidepressants, antihypertensives; resolves with discontinuation
HIV-associated diffuse infiltrative lymphocytosis syndrome (DILS) — Salivary gland enlargement and CD8+ infiltrate in HIV; SSA/SSB negative
Head and neck radiation history — Permanent xerostomia after radiation therapy
Diagnostic workup
Diagnostic criteria
ACR/EULAR 2016 classification criteria. Diagnosis requires a score ≥4 from the weighted items: anti-SSA positive (3), focus score ≥1 on labial biopsy (3), abnormal ocular staining score ≥5 (1), Schirmer test ≤5 mm/5 min (1), unstimulated salivary flow ≤0.1 mL/min (1). Patients must have symptoms of ocular or oral dryness or systemic features.
Labs
Anti-SSA (Ro) — positive in 70-90 percent; anti-SSB (La) — positive in 40-60 percent
Cryoglobulins, urinalysis, and renal function in suspected glomerulonephritis or cryoglobulinemia
Imaging
Schirmer test, tear breakup time, ocular staining score by ophthalmology
Unstimulated whole salivary flow rate (<0.1 mL/min is abnormal)
Salivary gland ultrasound — increasingly used to demonstrate characteristic glandular heterogeneity
Minor salivary gland (labial) biopsy — focus score ≥1 (≥1 cluster of ≥50 lymphocytes per 4 mm² of glandular tissue) is the gold standard
Diagnostic algorithm
Domain
Test
Abnormal Result
Ocular
Schirmer test
<5 mm wetting in 5 min
Ocular
Ocular staining score
≥5
Oral
Unstimulated salivary flow
≤0.1 mL/min
Serology
Anti-SSA (Ro)
Positive
Histology
Labial salivary gland biopsy
Focus score ≥1
Key diagnostic tests for Sjögren syndrome under the ACR/EULAR 2016 criteria.
Treatment
First-line
Symptom-directed therapy is the cornerstone
Dry eyes: preservative-free artificial tears, lubricant gels at night, environmental humidification, avoidance of antihistamines and decongestants; topical cyclosporine (Restasis) or lifitegrast for moderate-severe disease
Dry mouth: frequent sips of water, sugar-free lozenges and gum, saliva substitutes, meticulous dental hygiene with topical fluoride and routine cleanings
Cholinergic agonists (pilocarpine, cevimeline) to stimulate residual salivary and lacrimal function
Hydroxychloroquine for fatigue, arthralgia, and rash
Methotrexate or azathioprine for inflammatory arthritis
Second-line / adjunct
Systemic glucocorticoids for severe extraglandular disease (vasculitis, glomerulonephritis, severe inflammatory arthritis)
Rituximab for systemic involvement, cryoglobulinemic vasculitis, refractory disease, and certain neurologic complications
Immunosuppressive agents (mycophenolate, cyclophosphamide) for vasculitis, severe ILD, or glomerulonephritis
Punctal plugs for refractory ocular dryness
Complications
Severe dental caries, periodontal disease, oral candidiasis
Corneal ulceration and visual loss from severe keratoconjunctivitis sicca
Non-Hodgkin lymphoma — typically MALT lymphoma of the parotid; lifetime risk 5-10 percent, with persistent parotid enlargement, lymphadenopathy, low C4, and cryoglobulins as risk factors
Peripheral neuropathy (sensory, small fiber, sensorimotor) and CNS disease (rare)
Cutaneous vasculitis
PANCE pearls
Anti-SSA crosses the placenta and can cause congenital heart block in offspring — pregnancies require fetal echocardiographic monitoring between 16-26 weeks.
Persistent unilateral parotid enlargement raises concern for lymphoma and warrants biopsy.
Sjögren is the most common cause of distal renal tubular acidosis (type 1) — check for hypokalemic, non-anion-gap metabolic acidosis with inability to acidify urine.
Sicca symptoms can also result from medications — review the medication list before pursuing extensive workup.
References
ACR/EULAR 2016 — Shiboski CH et al., 2016 American College of Rheumatology/European League Against Rheumatism classification criteria for primary Sjögren's syndrome (Arthritis Rheumatol 2017)
EULAR 2020 — Ramos-Casals M et al., EULAR recommendations for the management of Sjögren's syndrome with topical and systemic therapies (Ann Rheum Dis 2020)
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