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Am J Kidney Dis. 2007 Sep;50(3):396-403.

Long-term risk of cancer in membranous nephropathy patients.

Author information

1
The Norwegian Kidney Biopsy Registry, Haukeland University Hospital, Bergen, Norway.

Abstract

BACKGROUND:

There is a well-known association between membranous nephropathy (MN) and cancer, and patients with MN usually are examined for cancer at the time of diagnosis. The long-term risk of cancer after MN is not well studied.

STUDY DESIGN:

Cohort study with record linkage between the Norwegian Kidney Biopsy Registry and Norwegian Cancer Registry.

SETTING & PARTICIPANTS:

161 patients with MN from 1988 to 2003.

PREDICTOR:

Patients with MN compared with the age- and sex-adjusted general Norwegian population.

OUTCOMES:

Cancer diagnosis reported through 2003.

RESULTS:

Mean duration of follow-up was 6.2 years (range, 0.1 to 15 years). 33 patients developed cancer; including 24 patients with cancer after the diagnosis of MN. Median time from diagnosis of MN to diagnosis of cancer was 60 months (range, 0 to 157 months). Mean annual incidence ratio of cancer was 2.4/100 person-years (2.1/100 person-years in the 0- to 5-year period and 2.8/100 person-years for the 5 to 15 years after kidney biopsy). During the 0 to 15 years after the diagnosis of MN, the expected number of cancers was 10.7, resulting in a standardized incidence ratio of cancer of 2.25 (95% confidence interval, 1.44 to 3.35). In the 5 to 15 years after diagnosis, standardized incidence ratio was 2.30 (95% confidence interval, 1.19 to 4.02). Patients with MN who developed cancer were older (65 versus 52 years; P < 0.001). Patients with cancer and MN had a greater mortality rate than patients without cancer (67% versus 26%; P < 0.001).

LIMITATIONS:

Follow-up treatment after MN with cytotoxic and immunosuppressive medications is not known.

CONCLUSIONS:

An increased risk of developing cancer is observed after the diagnosis of MN, which persists for many years.

PMID:
17720518
DOI:
10.1053/j.ajkd.2007.06.003
[Indexed for MEDLINE]

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