This is a prospective, multi-center, observational study in pregnant women with cystic fibrosis (CF) to characterize forced expiratory volume in 1 second (FEV1) changes based on exposure to highly effective cystic fibrosis transmembrane conductance regulator (CFTR) modulators. The key factors contributing to the change in lung function during pregnancy and for 2 years post-delivery will be evaluated along with assessment of fetal and maternal outcomes.
The total duration of participation for each participant is expected to be about 3 years (up to 35 months). Women will be enrolled in the first trimester of pregnancy and assessed every 3 months during pregnancy and during the first year after delivery, then every 6 months for an additional year. Over the course of the study, CF clinical data, patient-reported outcomes, questionnaires, obstetrical outcomes, infant growth, child development outcomes, baseline CF-related therapies and co-morbidities will be collected to enable evaluation of changes from before pregnancy to during pregnancy and post-delivery.
MAYFLOWERS participants will be provided an opportunity to participate in an optional continuous glucose monitoring (CGM) sub-study to evaluate glucose control in pregnancy. Participants will undergo CGM sensor placement and data collection as part of the MAYFLOWERS study.

Lamprene®/Clofazimine, is a product of the pharmaceutical company named Novartis Pharmaceuticals Corporation. Lamprene®/Clofazimine is approved by FDA (the U.S Food and Drug Administration) for the treatment of leprosy. It is being tested in non-Novartis clinical studies for drug resistant tuberculosis and non-tuberculous mycobacteria (NTM).

If you have been diagnosed with NTM, then your doctor may decide that this infection can be treated with Lamprene®/Clofazimine. This medicine is provided to you in an expanded access program. This means that this medicine is not registered for the treatment of NTM, but it can be used in special situations where there are no other possible treatments. For example, this may be because you have a type of Mycobacterial infection that is resistant or failed to respond optimally to other drugs, or because you have had side effects that prevent the use of other drugs.

The CF Patient Registry is an observational study. It does not involve medical treatments and serves only as an epidemiologic record of demographics, characteristics of disease and treatment, utilization patterns, and clinical outcomes.