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Area of Science:

  • Nephrology
  • Oncology
  • Immunosuppression Therapy

Background:

  • Phospholipase A2 receptor (PLA2R)-associated membranous nephropathy (MN) is a primary glomerulopathy.
  • The association between PLA2R-MN and cancer risk requires further investigation, particularly concerning the role of immunosuppressive therapy.

Purpose of the Study:

  • To evaluate cancer incidence and types in patients with PLA2R-associated MN.
  • To assess the impact of immunosuppressive therapy and clinical parameters on cancer development in this cohort.

Main Methods:

  • Retrospective cohort study of 239 adult patients with PLA2R-associated MN (1996-2021).
  • Assessment of cancer incidence, immunosuppressive therapy, response to therapy, PLA2R antibody titers, and comorbidities.
  • Comparison with age-adjusted US general population cancer incidence rates.

Main Results:

  • Cancer incidence was significantly higher (standardized incidence ratio = 1.93) compared to the general population.
  • Increased cancer risk was associated with age, smoking history, and prior cancer diagnosis.
  • Cyclophosphamide use showed a non-significant trend towards increased cancer risk; other therapies, PLA2R titers, and remission status were not associated with increased risk.

Conclusions:

  • The elevated cancer risk in PLA2R-MN patients appears independent of PLA2R antibody titers, remission status, or renal function.
  • Traditional risk factors do not fully account for the heightened malignancy risk.
  • PLA2R itself may contribute to oncogenesis through unknown mechanisms, warranting further research.