Clinical features of patients with immunoglobulin light chain amyloidosis (AL) with vascular-limited deposition in the kidney

Nephrol Dial Transplant. 2012 Mar;27(3):1097-101. doi: 10.1093/ndt/gfr381. Epub 2011 Nov 7.

Abstract

In the kidney, immunoglobulin light chain amyloidosis (AL) can be deposited in vascular-limited AL (V-AL) or diffuse (D-AL) pattern. These patterns are associated with different clinical presentations. A nested case study was performed to describe these differences. V-AL was defined by the vascular-limited deposits. Cases were matched for age, sex and date of renal biopsy. There were 12 cases of V-AL (mean age 61 ± 11 years) and 24 cases of D-AL. Median follow-up was 26 months for V-AL and 38 months for D-AL, P = 0.14. Lambda was more common in D-AL (83.3%) than V-AL (50%, P = 0.04). Cardiac function was similar between the two groups. V-AL patients presented with lower renal function (serum creatinine = 2.1 versus 1.3 mg/dL, P = 0.02; estimated glomerular filtration rate 31 versus 59 mL/min/1.73m(2), P = 0.01 and creatinine clearance 38.5 versus 64 mL/min/1.73m(2), P = 0.02, respectively). Proteinuria was low grade in V-AL [0.4 (0.09-0.98) g/day] compared to nephrotic range in D-AL patients [8.0 (0.2-22) g/day, P < 0.001]. Stem cell transplantation was performed on 62.5% of the D-AL but on only 25% of the V-AL, P = 0.08. Median survival was longer in patients with D-AL (77.2 months) versus V-AL (40.6 months, log-rank P = 0.02). Our study found that V-AL patients presented with more severe renal insufficiency and less proteinuria than D-AL. There was a preference for λ light chain in the D-AL that was not noted in the V-AL. Patients with D-AL in this study had a longer median survival but most of them were stem cell transplantation candidates.

Publication types

  • Comparative Study

MeSH terms

  • Aged
  • Amyloidosis / complications*
  • Amyloidosis / mortality
  • Amyloidosis / physiopathology*
  • Case-Control Studies
  • Echocardiography
  • Female
  • Follow-Up Studies
  • Glomerular Filtration Rate
  • Humans
  • Immunoglobulin Light Chains / metabolism*
  • Kidney / physiopathology*
  • Kidney Function Tests
  • Male
  • Middle Aged
  • Proteinuria / etiology
  • Proteinuria / metabolism
  • Stem Cell Transplantation
  • Survival Rate
  • Transplantation, Autologous
  • Treatment Outcome
  • Vascular Diseases / physiopathology*

Substances

  • Immunoglobulin Light Chains