Study | Results |
---|---|
Present Study | Prenatal BoBs™: Normal (4708, 97.03%); abnormal (144, 2.97%) |
Conventional karyotyping: Normal (4656, 95.96%); abnormal (196, 4.04%) | |
Combined use of BoBs™ and karyotyping: Normal (4633, 95.49%); abnormal (219, 4.51%) | |
Combined use of BoBs™ and karyotyping detected more abnormalities (4.51%) than BoBs™ alone (2.97%) or karyotyping alone (4.04%) | |
Leung et al. [21] | Traditional karyotyping and BoBs™: 2053 prenatal cases (1421 uncultured chorionic villus samples, 616 amniotic fluid samples, 16 other clinical samples) |
Traditional karyotyping: 100% concordance with BoBs™ for all non-mosaic cases involving trisomy 21, 18, and 13 | |
Saldarriaga et al. [24] | BAC aCGH plus karyotyping vs. karyotyping or BAC aCGH alone: 9974 pregnant patients |
aCGH: higher sensitivity (94.5% vs. 67.3%) and lower false-negative rate (4.5% vs. 33%) than karyotyping | |
No significant difference in false positives for aCGH and karyotyping (1.3% vs. 1%) | |
Perez-Duran et al. [25] | BoBs™: 50 samples from spontaneous abortions before 20 weeks gestation |
32% of samples had chromosomal abnormalities, 50% of which were the most common chromosomal abnormalities (Down syndrome, Turner syndrome, and trisomy 13) | |
BoBs™ (first study [11]): 408 samples and prospective testing of 212 consecutive samples: no false-positive results; no triploids; mosaic conditions at 20–30%; high predictive value (1 of 1700); high sensitivity (> 98%) and specificity (> 99%); false-negative rate below 2% | |
BoBs™ (second study [25]): 1653 prenatal samples: failure rate of 3.3%; overall detection rate of approximately 1 in 10. Detected abnormalities: 85% common aneuploidies; 11 duplications and microdeletions, with overall microdeletion and microduplication rate of 1 in 145 | |
Choy et al. [9] | BoBs™ and karyotyping: 2153 samples |
BoBs™ found 6 microdeletion syndromes, including DiGeorge syndrome, that karyotyping did not detect | |
BoBs™ sensitivity was 96.7% and specificity was 100% | |
Karyotyping detected 15 (0.7%) cases with major chromosomal abnormalities; BoBs™ detected only 8 (53.3%) of these 15 cases | |
Garcia-Herraro et al. [28] | BoBs™ combined with karyotyping: 364 prenatal samples; 309 amniotic fluid samples and 35 chorionic villus samples were normal |
Concordance rate of 98.51% between BoBs™ and conventional karyotyping | |
3 of 5 samples without agreement had chromosomal abnormalities not detected by BoBs™ (2 Robertsonian translocations, 1 reciprocal translocation and 2 with polymorphisms) | |
Grati et al. [15] | BoBs™ plus karyotyping: 9648 samples |
Overall incidence rate of 0.7% for cryptic imbalances | |
BoBs™ had low a priori risk of approximately 0.3% | |
Rosenfeld et al. [19] | BoBs™ and karyotyping: 2940 samples |
7.9% aneuploidies and 0.45% partial chromosomal abnormalities | |
Combined with karyotyping, additional detection of 1 in 745 for low risk cases (e.g. normal ultrasound and isolated ultrasound marker and increased nuchal measurements), and 1 in 165 for fetal structural or growth abnormalities | |
Rosenfeld et al. [29] | aCGH compared with other traditional analyses: 535 fetal demise samples |
aCGH detected significant clinical abnormalities in 12.8% of samples characterized as normal or unknown karyotypes | |
Normal karyotype subset: significant clinical abnormalities in 6.9% (20 of 288); 107 samples examined by aCGH and SNP: SNP detected significant clinical abnormalities in 7 cases (7.5%) | |
aCGH did not provide fetal results for 8.3% (20 cases) because of poor DNA quality and maternal cell contamination |