Lupus & antiphospholipid syndrome

Total Tubulointerstitial Score: a simple and effective predictor of long-term mortality and adverse renal outcomes in lupus nephritis

Lupus Sci MedPublished Cohort study

Main finding · All-cause mortalityResult — go to the resultHazard ratio 1.50 95% CI 1.02–2.22

Authors' conclusion

TTS provides a comprehensive assessment of renal tubulointerstitial lesions and is a simple and effective predictor of long-term mortality and adverse renal outcomes in LN.

Study context

Population
Patients with lupus nephritis (LN) diagnosed from 1996 to 2018 at the First Affiliated Hospital of Sun Yat-sen University
Participants
832 patients
Exposure
TTS >2 vs TTS ≤2
Outcome
Long-term all-cause mortality and adverse renal outcomes
Methodological detailssingle-centre, Kaplan-Meier survival curves, multivariate Cox regression
  • Single-centre
  • Kaplan-Meier survival curves
  • Multivariate Cox regression

Main finding

All-cause mortality

Hazard ratio

1.50

95% CI 1.02–2.22

P = 0.039

TTS >2vs TTS ≤2
HR 1.50 (95% CI 1.02–2.22); P = 0.039

As reported in the abstract

Observational data: associations, not effects.

Further findings

OutcomeHR (95% CI)P value
Adverse renal outcomesMultivariate Cox analysis; independently associated1.63 (1.05–2.52)P = 0.030

Correlates of TTS

TTS negatively correlated with eGFR, haemoglobin and serum albumin; positively correlated with proteinuria (Pearson)
TTS significantly higher in proliferative LN

Original publication

Total Tubulointerstitial Score: a simple and effective predictor of long-term mortality and adverse renal outcomes in lupus nephritis. Lupus Sci Med. Published 20 June 2025. doi:10.1136/lupus-2025-001578

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