Abstract
We searched for criteria that could indicate breast cancer families with a high prior probability of being caused by the breast/ovarian cancer susceptibility locus BRCA1 on chromosome 17. To this end, we performed a linkage study with 59 consecutively collected Dutch breast cancer families, including 16 with at least one case of ovarian cancer. We used an intake cut-off of at least three first-degree relatives with breast and/or ovarian cancer at any age. Significant evidence for linkage was found only among the 13 breast cancer families with a mean age at diagnosis of less than 45 years. An unexpectedly low proportion of the breast-ovarian cancer families were estimated to be linked to BRCA1, which could be due to a founder effect in the Dutch population. Given the expected logistical problems in clinical management now that BRCA1 has been identified, we propose an interim period in which only families with a strong positive family history for early onset breast and/or ovarian cancer will be offered BRCA1 mutation testing. More recent work has indicated that RUL09 is probably due to BRCA2 (multipoint lod score of 1.17), while in families RUL47 and RUL49 a frameshift mutation in BRCA1 has been evidenced. Each of these two latter families contain an early-onset sporadic breast cancer patient, explaining their negative lod scores with 17q-markers.
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Cornells, R.S., Vasen, H.F.A., Meijers-Heijboer, H. et al. Age at diagnosis as an indicator of eligibility for BRCA1 DNA testing in familial breast cancer. Hum Genet 95, 539–544 (1995). https://doi.org/10.1007/BF00223866
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DOI: https://doi.org/10.1007/BF00223866