Schreurs et al. analysed peripheral monocyte subsets in LTx patients with and without BOS [61] and found a reduction in the number of non-classical monocytes, i.e., those expressing SLAN-positivity, in the former, whereas the expression of SLAN-positivity was higher in BOS patients. This evidence concerns the gene SECISBP2L and Buschke-Ollendorff syndrome.