Table 1 Characteristics of the primary studies included in the meta-analysis
From: A systematic review and meta-analysis of pregnancy-associated breast cancer incidence rate
ID | Country | First Author | Year | Included Population | Sample size | BC Number | Study design | Sampling Method | PABC definition | Risk score | Ref |
|---|---|---|---|---|---|---|---|---|---|---|---|
1 | South Korea | Kang EJ | 2016 | Women who had given birth during the 2010–2012 | 1,384,551 | 317 | Cohort | Not mentioned | Within 1 year after delivery (and not the pregnancy period) | 6 | [27] |
2 | Italy | Parazzini F | 2017 | Not mentioned | 1,200,263 | 479 | Population-based linkage study | All registered cases | During pregnancy (3-month before delivery for abortions and 9-month before delivery for normal deliveries) and 1 year after delivery | 8 | [30] |
3 | USA | Smith LH | 2003 | A group of women with 4,846,505 obstetric deliveries in California | 4,846,505 | 935 | Population-based retrospective review of cases | All registered cases | During pregnancy or within 1 year after delivery | 7 | [19] |
4 | Australia | Lee YY | 2012 | Women who gave birth in New South Wales | 1,309,501 | 377 | Population-based cohort study | All registered cases | During pregnancy or within 1 year after delivery | 9 | [22] |
5 | Australia | Lee YY | 2013 | Not mentioned | 679,736 | 218 | Validation study | Not mentioned | During pregnancy or within 1 year after delivery | 6 | [25] |
6 | South Korea | Park S | 2022 | Women under the age of 50 who experienced their first childbirth | 1,528,152 | 334 | NIH data registry | All registered cases | Within 1 year after delivery (and not the pregnancy period) | 7 | [36] |
7 | Italy | Murgia F | 2019 | Pregnant women | 682,173 | 257 | Population based linkage study | All registered cases | During pregnancy (3-month before delivery for abortions and 9-month before delivery for normal deliveries) and 1 year after delivery | 9 | [32] |
8 | Canada | Abenhaim HA | 2012 | Women who delivered during the admission to hospital | 8,826,137 | 573 | Population-based cohort | All registered cases | GBC (only during pregnancy and not afterwards) | 6 | [21] |
9 | South Korea | Shim MH | 2016 | Women who were diagnosed with cancer during pregnancy at a tertiary academic hospital | 50,412 | 20 | Retrospective cohort study | All registered cases | GBC (only during pregnancy and not afterwards) | 6 | [28] |
10 | Denmark | Eibye S | 2013 | Patients aged 15–44 years at first primary cancer diagnosis | 2,427,670 | 489 | Using data from the nationwide Danish registries | All registered cases | During pregnancy or within 1 year after delivery | 8 | [24] |
11 | USA | Cottreau CM | 2019 | Pregnancies among women aged 10–54 years during 2001–2013 | 775,709 | 208 | Population based | All registered cases | During pregnancy or within 1 year after delivery | 7 | [31] |
12 | Northern Ireland | Lynch GA | 1969 | Not mentioned | 337,342 | 45 | Not mentioned | Not mentioned | Not defined | 4 | [16] |
13 | Sweden | Andersson TM | 2015 | Identified live births in women aged 15–44 years from 1963 to 2007 | 4,580,005 | 677 | Population-based Swedish Cancer Register | All registered cases with live births | During pregnancy or within 1 year after delivery | 8 | [26] |
14 | USA | Tharmaratnam U | 2012 | all patients with a diagnosis of cancer, who delivered after 12 weeks of gestation | 116,474 | 17 | Retrospective data collection | Retrospective data collection of pregnant cancer patients | GBC (only during pregnancy and not afterwards) | 5 | [23] |
15 | Sweden | Andersson TM | 2009 | Women aged 15–44 years at the date of breast cancer diagnosis | 4,156,190 | 539 | Population-based cohort study | All registered cases | During pregnancy or within 1 year after delivery | 8 | [20] |
16 | Nigeria | Aghadiuno PU | 1983 | Identified from the records of the Cancer Registry Nigeria | 51,058 | 14 | Retrospective data collection | All registered cases | During pregnancy or within 1 year after delivery | 6 | [17] |
17 | USA | Shechter Maor G | 2019 | All delivery records who delivered during their admission | 11,846,300 | 772 | Population based cohort study | All registered cases | GBC (only during pregnancy and not afterwards) | 8 | [33] |
18 | Norway | Albrektsen G | 1995 | Norwegian women born in 1935–71 | 802,457 | 121 | Population based cohort study | All registered cases | During pregnancy or within 1 year after delivery | 8 | [18] |
19 | Australia and New Zealand | Sullivan E | 2022 | Women participated in the Australasian Maternity Outcomes Surveillance System | 533,000 | 40 | Population based prospective cohort study | All registered cases | GBC (only during pregnancy and not afterwards) | 7 | [37] |
20 | Sweden | Lu D | 2017 | Newborns | 3,947,215 | 707 | Swedish Medical Birth Register (MBR) | All registered cases | During pregnancy or within 1 year after delivery | 9 | [29] |
21 | Australia | Safi N | 2021 | All women with pregnancies that ended in live birth or stillbirth | 1,783,116 | 122 | Population-based cohort study | All registered cases | GBC (only during pregnancy and not afterwards) | 8 | [35] |
22 | China | Yp Z | 2019 | Pregnant women | 80,524 | 6 | Prospective, multi-center cohort study | All registered cases | GBC (only during pregnancy and not afterwards) | 7 | [34] |