Lung transplantation for advanced cystic lung disease due to nonamyloid kappa light chain deposits.
RATIONALE
Cystic lung light chain deposition disease (LCDD) is a severe and rare form of nonamyloid kappa light chain deposits localized in the lung, potentially leading to end-stage respiratory insufficiency.


OBJECTIVES
To assess the outcome after lung transplantation (LT) in this setting with particular attention to disease recurrence.


METHODS
We conducted a retrospective multicenter study of seven patients who underwent LT for cystic lung LCDD in France between September 1992 and June 2012 in five centers.


MEASUREMENTS AND MAIN RESULTS
In total, five females and two males (mean age, 39.1 ± 5.3 yr) underwent one single LT or seven double LT (one retransplantation). Before LT, the patients showed a constant obstructive ventilatory pattern with low carbon monoxide diffusing capacity and resting hypoxemia. Lung computed tomography revealed widespread cysts with occasional micronodulations. No extrapulmonary disease or plasma cell neoplasm was detected. The serum-free kappa/lambda light chain ratio was increased in three cases. The median follow-up after LT was 56 months (range, 1-110 mo). Kaplan-Meier survival was 85.7, 85.7, and 64.3% at 1, 3, and 5 years, respectively. Three patients died from multiorgan failure (n = 1), chronic rejection (n = 1), and breast cancer (n = 1) at 23 days, 56 months, and 96 months, respectively. At the end of follow-up, no patients showed recurrence on imaging or histopathology.


CONCLUSIONS
This small case series confirms that cystic lung LCDD is a severe disease limited to the lung, affecting mostly young females. LT appears to be a good therapeutic option allowing for satisfactory long-term survival. We found no evidence of recurrence of the disease after LT.