Data regarding oCOR application to CLD patients were limited (Wrobel et al., 2016), but we demonstrated a poor relationship between [Hb] and tHb‐mass in CLD (r = .410, p = .11) with PV explaining much of the variance in [Hb] (Otto, Plumb, Clissold, et al., 2017). This evidence concerns the gene GSTM1 and congenital secretory chloride diarrhea 1.