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J Med Genet 46:752-758 doi:10.1136/jmg.2009.067215
  • Letter to JMG

The very low penetrance of cystic fibrosis for the R117H mutation: a reappraisal for genetic counselling and newborn screening

Table 2

Probability of occurrence of clinical features at specific age in 166 French [F508del]+[R117H;T7] compound heterozygous individuals

NBS children (n = 61) Non-NBS individuals (n = 105)
No. of affected cases/no. of patients with available data Frequency (%) Penetrance of clinical features (%)* at age (years) No. of affected cases/no. of patients with available data Frequency (%) Penetrance of clinical features (%)* at age (years)
2 (99% CI) 2 (99% CI) 10 (99% CI) 30 (99% CI)
Pulmonary symptoms 10/59 17 21 (10 to 42) 29/96 30 8 (3 to 19) 16 (8 to 28) 28 (17 to 42)
    Asthma 7/59 12 15 (6 to 37) 9/96 9 4 (1 to 14) 8 (4 to 20) 10 (4 to 21)
    Disseminated bronchiectasis 0/59 0 0 (NA) 7/96 7 0 (NA) 0 (NA) 5 (1 to 16)
Nasopharyngeal symptoms 7/59 12 14 (5 to 37) 18/92 20 5 (2 to 16) 9 (4 to 21) 20 (11 to 34)
    Chronic sinusitis 7/59 12 14 (5 to 37) 13/92 14 5 (2 to 16) 10 (4 to 22) 15 (8 to 28)
    Nasal polyposis 0/59 0 0 (NA) 7/92 8 0 (NA) 0 (NA) 8 (3 to 21)
Pancreatic symptoms 1/59 2 2 (0 to 20) 7/84 8 0 (NA) 0 (NA) 8 (3 to 23)
    Pancreatic insufficiency 1/59 2 2 (0 to 20) 2/84 2 0 (NA) 0 (NA) 2 (0 to 19)
    Chronic pancreatitis 0/59 0 0 (NA) 0/84 0 0 (NA) 0 (NA) 0 (NA)
    Acute pancreatitis 0/59 0 0 (NA) 5/84 6 0 (NA) 0 (NA) 4 (1 to 18)
Staphylococcus aureus positive sputum/oropharyngeal cultures† 19/49 39 37 (21 to 59) 10/37 27 0 (NA) 12 (3 to 36) 31 (13 to 63)
Pseudomonas aeruginosa positive sputum/oropharyngeal cultures† 6/49 12 13 (4 to 35) 1/39 3 0 (NA) 0 (NA) 0 (NA)
  • NA, not applicable; NBS, newborn screened; non-NBS, individuals who were not referred through newborn screening.

  • *Results are Kaplan–Meier estimates

  • †Oropharyngeal cultures in NBS children; sputum cultures in non-NBS individuals.

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