NDT Advance Access originally published online on August 5, 2006
Nephrology Dialysis Transplantation 2006 21(11):3324-3326; doi:10.1093/ndt/gfl456
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© The Author [2006]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
(Section Editor: A. Meyrier)
Crescentic glomerulonephritis and malignancyguilty or guilt by association?
Medical Faculty of the Charité, Franz Volhard Clinic and Department of Pathology, HELIOS Klinikum-Berlin, Germany
Correspondence and offprint requests to: Ralph Kettritz, MD, Franz Volhard Clinic, Wiltbergstrasse 50, 13122 Berlin, FRG. Email: kettritz{at}charite.de
Keywords: ANCA; crescentic glomerulonephritis; malignancy
| Introduction |
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Rapidly progressive glomerulonephritis (GN) is one of the harrowing challenges in nephrology. The condition is histologically characterized by extracapillary proliferation with crescent formation. Most crescentic glomerulonephritides occur in systemic autoimmune diseases and require prompt immunosuppressive treatment. Occasionally, patients with crescentic GN may be diagnosed with an additional life-threatening disease, namely malignant neoplasms. Immunosuppressive drugs may promote such malignancies. However, some patients are initially diagnosed with both diseases, suggesting a more intimate relationship between crescentic glomerulonephritis and malignancies.
We recently encountered a 68-year-old man, referred to us from the urology department because of an increasing serum creatinine. He had initially presented with intermittent haematuria a month earlier. Cystoscopy revealed an exophytic bladder tumour that was resected. Histological examination (Figure 1) disclosed papillary carcinoma. When the patient returned for follow-up 4 weeks after tumour resection, his creatinine had increased from slightly above normal values to 307 µmol/l. The patient denied fever, weight loss, night sweats, cough, sputum production, skin or joint abnormalities. He had coronary artery disease with prior myocardial infarction, and had undergone coronary bypass surgery 8 years earlier. His blood pressure was 140/80 mmHg and his lungs were clear. He had a functional systolic ejection murmur and no oedema. The laboratory urine testing revealed blood in the urine, no evidence of infection, but 3.7 g of protein per 24 h. An initial urinary sediment shortly after cystoscopy showed many eumorphic erythrocytes. Serum potassium concentration was 5.41 mmol/l, albumin was 3.9 g/dl, total protein was 7.1 g/dl, the haemoglobin 12.7 g/dl. Diagnostic ultrasound revealed two normal-sized kidneys. Renal blood flow in arteries and veins showed no abnormalities. However, a repeated urinary sediment after cessation of macrohaematuria showed occasional granular casts and numerous erythrocytes, some of which were dysmorphic. Serological testing was positive for perinuclear anti-cytoplasmic antibodies with specificity for myeloperoxidase (MPOANCA) at 520 U/ml. A computerized tomogram of the lungs revealed a left lower lobe infiltrative process that had been hidden by the cardiac silhouette in an earlier chest X-ray. A renal biopsy showed a diffuse proliferative extracapillary GN (Figure 2). Immunofluorescence was scant to absent (pauci-immune). The diagnosis of an MPOANCA positive necrotizing crescentic GN was made. Cyclophosphamide and prednisone were begun and the serum creatinine, that had peaked at 450 µmol/l, decreased to 180 µmol/l. The patient was spared dialysis.
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Causes of acute renal failure in cancer patients are diverse. Impaired renal function, even if the decrease in glomerular filtration rate is small, has substantial effects on morbidity and mortality. Nephrotoxicity is associated with chemotherapy, supportive drugs and contrast agents. More recently, new protocols that include bone marrow transplantation were shown to be associated with additional, rather specific renal insults, including marrow-infusion toxicity and hepato-renal syndrome after veno-occlusive disease [1]. Furthermore, the malignant disease itself can lead to acute renal failure for several reasons. In patients with this aetiology, post-renal obstruction is frequently observed, whereas direct infiltration of the kidneys, for example by lymphomas occurs, but is rarely the cause of acute renal failure.
| Crescentic glomerulonephritis in patients with malignancies |
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An increased rate of malignancy in patients with membranous GN was the first association between cancer and glomerular disease to be reported [2]. Since then, GN of virtually all types has been described in conjunction with either solid or haematological neoplasms [3,4]. Severe forms of crescentic GN affecting more than 50% of the glomeruli were also found in biopsies from cancer patients. This rapidly progressive type of GN was most commonly characterized by paucity of immunoglobuline deposition. However, crescentic GN in cancer patients may also occur with anti-GBM antibody [5,6] or immune complex deposition [79]. Underlying malignancies found in patients with pauci-immune crescentic GN include solid tumours, such as prostate cancer, transitional cancer of the bladder, adenocarcinoma of the lung and occult gastric carcinoma [1012], as well as haematological neoplasms, such as myelodysplastic [13] and myeloproliferative syndromes [14] and lymphatic leukaemia [15]. After tests for anti-neutrophil cytoplasmic antibodies (ANCA) became available, most cases of pauci-immune crescentic GN were found to be ANCA associated [14], and this also applies in cancer patients.
In addition to these case reports, Biava et al. [16]. systematically studied a series of 80 patients with crescentic GN. The authors identified an underlying cancer in seven cases, compared with only one in 80 patients with minimal change disease and focal segmental sclerosing glomerulonephritis (FSGS). These data suggest an increased incidence of solid tumours in patients with crescentic GN. All crescentic glomerulonephritides reported by Biava had a pauci-immune immunofluorescence pattern as found in ANCA patients. However, this study was performed before ANCA testing was available.
Tatsis et al. [17] studied 477 patients with Wegener's granulomatosis and an age-matched group of rheumatoid arthritis patients. Cancer diagnoses at or before diagnosis of the autoimmune disease were more common in the former cohort. This finding was most marked for renal cell carcinoma with seven cases in patients with Wegener's granulomatosis vs one case in the rheumatoid arthritis group. The observation of an increased risk of malignancy has been confirmed in a cohort of 200 patients with Wegener's granulomatosis and microscopic polyangitis from England [18]. However, as cancers occurred up to 512 months after the diagnosis of vasculitis, the effect of cytotoxic treatment cannot be excluded. Aggressive immunosuppression exposes patients to an increased risk of cancer. For example, the incidence of bladder cancer after 12 months of cyclophosphamide treatment was 11-fold elevated in patients with Wegener's granulomatosis and microscopic polyangiitis [19]. The risk doubled for every 10 g of the drug in a Swedish cohort that also showed an increase in other types of malignancies, including squamous-cell skin cancer and haematological neoplasms [20].
| Could dysregulated epithelial proliferation be the link between crescentic GN and cancer? |
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A number of candidate mechanisms that could link malignancy and GN have been postulated, including dysregulated T-cell response and elaboration of various cytokines. An interesting molecule in this regard is uteroglobin, a small, 17 kDa, homodimeric secreted protein that is expressed by most epithelia such as lung, prostate and endometrium [21]. Uteroglobin is markedly reduced in several carcinomas and was found to be chiefly responsible for invasive growth of epithelial tumours cells [22]. When uteroglobin was deleted in mice, the animals were more susceptible to lung cancer [23]. Interestingly, uteroglobin-deleted mice and uteroglobin-antisense-RNA expressing mice also develop glomerular lesions with the deposition of fibrin and IgA [24]. Moreover, Lee et al. [25] were able to prevent experimental crescentic GN by intraveneously administered recombinant uteroglobin.
We do not know if our patient's bladder cancer was in any way related to his crescentic GN. There were alternative explanations for acute renal failure in our patient and we rather believe that most physicians would not have pursued the possiblity of glomerular disease in this patient. The fact that the diagnosis of ANCA-associated crescentic GN was established and prompt treatment was initiated improved his outcome. There should be a high index of suspicion in the initial evaluation and follow-up of patients with crescentic GN. Furthermore, patients with cancer and haematuria deserve several careful urinary sediment evaluations.
Conflict of interest statement. None declared.
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