- CF-causing: when in trans with another CF-causing mutation,  will result in CF.
 
           - CFTR-RD causing: when in trans with a CF-causing mutation,  will result in CFTR-related disorders (CFTR-RD) such as chronic pancreatitis, bronchiectasis, CRS-NP (chronic rhinosinusitis with or without nasal polyposis) or CBAVD (congenital absence of vas deferens), according to Bombieri C et al., 2011.
 
           - Varying clinical consequence:  when in trans with another CF-causing mutation, can either result in CF or in a CFTR-RD.
                                                       
           - Non disease-causing: when in trans with a CF-causing mutation, will not cause CF, nor CFTR-RD.
 
           - VUS (Variant of unknown clinical significance): unclassified because of insufficient data.
 
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