Background To investigate the performance of primary ultrasound (P-US) screening for breast cancer, and that of supplemental ultrasound (S-US) screening for breast cancer after negative mammography (MAM).
Methods Electronic databases (PubMed, Scopus, Web of Science, and Embase) were systematically searched to identify relevant studies published between January 2003 and May 2018. Only high-quality or fair-quality studies reporting any of the following performance values for P-US or S-US screening were included: sensitivity, specificity, cancer detected rate (CDR), recall rate (RR), biopsy rate (BR), proportion of invasive cancers among screening-detected cancers (ProIC), and proportion of node-negative cancers among screening-detected invasive cancers (ProNNIC).
Results Twenty-three studies were included, including 12 studies in which S-US screening was used after negative MAM and 11 joint screening studies in which both primary MAM (P-MAM) and P-US were used. Meta-analyses revealed that S-US screening could detect 96% [95% confidential intervals (CIs): 82% to 99%] of occult breast cancers missed by MAM and identify 93% (95% CIs: 89% to 96%) of healthy women, with a CDR of 3.0/1000 (95%CIs: 1.8/1000 to 4.6/1000), RR of 8.8% (95%CIs: 5.0% to 13.4%), BR of 3.9% (95%CIs: 2.7% to 5.4%), ProIC of 73.9% (95%CIs: 49.0% to 93.7%), and ProNNIC of 70.9% (95%CIs: 46.0% to 91.6%). Compared with P-MAM screening, P-US screening led to the recall of significantly more women with positive screening results [1.5% (95%CIs:0.6% to 2.3%), P =0.001] and detected significantly more invasive cancers [16.3% (95%CIs: 10.6% to 22.1%), P < 0.001]. However, there were no significant differences for other performance measures between the two screening methods, including sensitivity, specificity, CDR, BR, and ProNNIC.
Conclusions Current evidence suggests that S-US screening could detect occult breast cancers missed by MAM. P-US screening has shown to be comparable to P-MAM screening in women with dense breasts in terms of sensitivity, specificity, cancer detection rate, and biopsy rate, but with higher recall rates and higher detection rates for invasive cancers.

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Posted 25 Mar, 2020
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Received 29 Oct, 2019
On 30 Sep, 2019
On 30 Sep, 2019
Invitations sent on 26 Sep, 2019
On 01 Sep, 2019
On 28 Aug, 2019
On 27 Aug, 2019
On 26 Aug, 2019
Posted 25 Mar, 2020
On 20 Apr, 2020
Invitations sent on 15 Apr, 2020
On 25 Mar, 2020
On 24 Mar, 2020
On 23 Mar, 2020
On 12 Mar, 2020
Received 11 Mar, 2020
Received 05 Mar, 2020
On 14 Feb, 2020
On 13 Feb, 2020
Invitations sent on 12 Feb, 2020
On 29 Jan, 2020
On 28 Jan, 2020
On 28 Jan, 2020
On 10 Jan, 2020
Received 30 Dec, 2019
Received 26 Dec, 2019
On 04 Dec, 2019
On 02 Dec, 2019
Invitations sent on 02 Dec, 2019
On 28 Nov, 2019
On 27 Nov, 2019
On 27 Nov, 2019
On 15 Nov, 2019
Received 13 Nov, 2019
Received 29 Oct, 2019
On 30 Sep, 2019
On 30 Sep, 2019
Invitations sent on 26 Sep, 2019
On 01 Sep, 2019
On 28 Aug, 2019
On 27 Aug, 2019
On 26 Aug, 2019
Background To investigate the performance of primary ultrasound (P-US) screening for breast cancer, and that of supplemental ultrasound (S-US) screening for breast cancer after negative mammography (MAM).
Methods Electronic databases (PubMed, Scopus, Web of Science, and Embase) were systematically searched to identify relevant studies published between January 2003 and May 2018. Only high-quality or fair-quality studies reporting any of the following performance values for P-US or S-US screening were included: sensitivity, specificity, cancer detected rate (CDR), recall rate (RR), biopsy rate (BR), proportion of invasive cancers among screening-detected cancers (ProIC), and proportion of node-negative cancers among screening-detected invasive cancers (ProNNIC).
Results Twenty-three studies were included, including 12 studies in which S-US screening was used after negative MAM and 11 joint screening studies in which both primary MAM (P-MAM) and P-US were used. Meta-analyses revealed that S-US screening could detect 96% [95% confidential intervals (CIs): 82% to 99%] of occult breast cancers missed by MAM and identify 93% (95% CIs: 89% to 96%) of healthy women, with a CDR of 3.0/1000 (95%CIs: 1.8/1000 to 4.6/1000), RR of 8.8% (95%CIs: 5.0% to 13.4%), BR of 3.9% (95%CIs: 2.7% to 5.4%), ProIC of 73.9% (95%CIs: 49.0% to 93.7%), and ProNNIC of 70.9% (95%CIs: 46.0% to 91.6%). Compared with P-MAM screening, P-US screening led to the recall of significantly more women with positive screening results [1.5% (95%CIs:0.6% to 2.3%), P =0.001] and detected significantly more invasive cancers [16.3% (95%CIs: 10.6% to 22.1%), P < 0.001]. However, there were no significant differences for other performance measures between the two screening methods, including sensitivity, specificity, CDR, BR, and ProNNIC.
Conclusions Current evidence suggests that S-US screening could detect occult breast cancers missed by MAM. P-US screening has shown to be comparable to P-MAM screening in women with dense breasts in terms of sensitivity, specificity, cancer detection rate, and biopsy rate, but with higher recall rates and higher detection rates for invasive cancers.

Figure 1

Figure 2
Figure 3
Figure 4
This is a list of supplementary files associated with this preprint. Click to download.
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