Modulators do not reach everyone who has CF. The third panel above says it plainly: they do not address every CFTR variant. But a genotype is not the only thing that decides who can get a treatment. Whether a country has licensed a modulator, and whether its health system pays for it, decide too. Access is a matter of systems, prices and decisions, not of anyone's worth.
What the registries show
Europe. The European Cystic Fibrosis Society Patient Registry (ECFSPR) report for 2024 maps, for each modulator, whether it was licensed and reimbursed by the national health service in each of the countries taking part in the registry that year. The information was supplied by each country's nominated representative. Source: ECFSPR Annual Data Report 2024, chapter nine, from the registry's annual reports page.
Canada. The Canadian Cystic Fibrosis Registry's report for 2024 notes that people who became eligible after an expansion in July 2024 may not have had access straight away. The report gives two possible reasons: delays in drug coverage, and a person's own choice not to start treatment. Source: Canadian Cystic Fibrosis Registry Annual Data Report 2024, from the registry's page.
United States. Within the U.S. registry the picture is uneven too. The 2024 report gives data for adolescents and adults counted as not eligible for a modulator by age or genotype; that count includes people who are eligible only for the newly approved Alyftrek. Of that group, 14.9 percent are Black and 23.7 percent are Hispanic, against 3.4 percent and 10.3 percent of the whole registry. These are shares of one group, not rates of anything, and they say nothing about why. Source: Cystic Fibrosis Foundation Patient Registry 2024 Annual Data Report, from the Foundation's registry page.
The three reports were read for this page on 2026-10-05. Each registry counts its own population in its own way, and we compare no figure from one registry with another.
What we do not know yet
We do not have a verified count of how many people with CF worldwide cannot get a modulator, and we will not guess one. The only worldwide figure on this page is the dated 2022 population estimate in the second panel above. The lab does not speak for anyone and has no way to change any of this. What it can do is show the evidence plainly and point to the people who gather it.
Further reading, listed and not summarized
Peer-reviewed papers on access and inequity, found with the lab's evidence tool. The list includes work on prices and production costs; we say no more about cost than that title does.
- International disparities in diagnosis and treatment access for cystic fibrosis.Guo J and others · Pediatric pulmonology · 2024 · DOI · PubMed
- Disparities in Access to Cystic Fibrosis Therapy Across Countries.Karadag B and others · Pediatric pulmonology · 2026 · DOI · PubMed
- Health inequity in people with cystic fibrosis: can we close the gap?Sermet-Gaudelus I and others · Annals of the American Thoracic Society · 2026 · DOI · PubMed
- Strategies used to access CFTR modulators in countries without reimbursement agreements.Guo J and others · Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society · 2025 · DOI · PubMed
- Current prices versus minimum costs of production for CFTR modulators.Guo J and others · Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society · 2022 · DOI · PubMed
- Real-world disparities and ethical considerations with access to CFTR modulator drugs: Mind the gap!Zampoli M and others · Frontiers in pharmacology · 2023 · DOI · PubMed
Six records, as the lab's evidence tool returned them from PubMed on 2026-10-05. The lab lists these papers and has not summarized their findings; the titles speak for themselves.