Immune function assay (immunknow) drop over first 6 months after renal transplant: a predictor of opportunistic viral infections?

Transplant Proc. 2014 Sep;46(7):2220-3. doi: 10.1016/j.transproceed.2014.07.050.

Abstract

Background: The Immuknow assay (IKA; Cylex) is a T-cell immune function assay that evaluates immunoreactivity in immunocompromised patients. The aim of this study was to analyze IKA values in a cohort of kidney transplantation (KT) recipients to investigate correlations between single-time point low IKA values and their trend over time with cytomegalovirus (CMV) or BK virus (BKV) reactivation.

Methods: A total of 118 adult patients receiving deceased-donor KT were enrolled (55.6±11.9 years old; 79 [66.9%] male). IKA CMV and BKV viremia determinations and were performed at months 1, 3, and 6 after surgery.

Results: Overall, 272 IKA determinations were performed: IKA values significantly decreased from month 1 (422±184 ng/mL) to month 3 (330±159 ng/mL; P<.001) and from month 3 to month 6 (300±128 ng/mL; P=.030). IKA values did not correlate with renal function or viral reactivation at any time. However, patients with either CMV or BKV viremia had a trend to higher IKA values at month 1 and lower IKA values at month 6, even if the difference did not reach a statistical significance (P=.115).

Conclusions: Our study suggests that presence of low immunologic reactivity (IKA<225 ng/mL) is not associated with an increased risk of CMV and BKV reactivation over the 1st 6 months after KT. However, a trend to a more pronounced drop in IKA values over time was observed in patients with viral reactivation. These preliminary results suggests that drop in IKA values within the 1st post-KT months, unlike single-time point immune function assay, may predict the risk of opportunistic viral infections.

MeSH terms

  • Cytomegalovirus Infections / blood
  • Cytomegalovirus Infections / diagnosis
  • Cytomegalovirus Infections / immunology*
  • Female
  • Humans
  • Immunologic Tests*
  • Kidney Transplantation*
  • Male
  • Middle Aged
  • Opportunistic Infections / blood
  • Opportunistic Infections / diagnosis
  • Opportunistic Infections / immunology*
  • Polyomavirus Infections / blood
  • Polyomavirus Infections / diagnosis
  • Polyomavirus Infections / immunology*
  • Postoperative Complications
  • Viremia / diagnosis
  • Virus Activation