Key points
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Half of French and Quebec radiologists interpret 1–10 breast MRI exams per week
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MRI-guided breast biopsies are not widely available in both countries
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Quebec demonstrates a higher waiting time than France for breast MRI exams
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Most of preoperative breast MRIs are performed within 3 weeks in both countries
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Surgeon’s opinion influences recommendation of preoperative MRI in Quebec
Background
Methods
Québec | France | p value χ2 test | |||
---|---|---|---|---|---|
Proportions | 95% CI | Proportions | 95% CI | ||
Age (years) | |||||
< 30 | 0% (0/38) | [0–0] | 0.8% (1/132) | [0–2.3] | 0.590 |
30–39 | 18.4% (7/38) | [5.5–31.3] | 18.9% (25/132) | [12.2–25.7] | 0.943 |
40–49 | 47.4% (18/38) | [30.7–64] | 28.8% (38/132) | [22–36.6] | 0.032 |
50–59 | 26.3% (10/38) | [11.6–41] | 37.1% (49/132) | [28.8–45.5] | 0.218 |
≥ 60 | 7.9% (3/38) | [1.1–16.88] | 14.4% (19/132) | [8.3–21.5] | 0.293 |
Academic hospital | 26.3% (10/38) | [11.6–41] | 16.7% (22/132) | [10.2–23.1] | 0.180 |
Private clinic | 63.2% (24/38) | [47.1–79.2] | 22.2% (28/132) | [14.1–28.3] | < 0.0001 |
Community hospital | 10.5% (4/38) | [0.3–21.7] | 62.1% (82/132) | [53.7–70.5] | < 0.0001 |
Québec | France | p value χ2 test | |||
---|---|---|---|---|---|
Proportions | 95% CI | Proportions | 95% CI | ||
Number of examinations per week | |||||
None | 37.8% (14/37) | [22.4–54.2] | 2.3% (3/128) | [0.3–5] | < 0.0001 |
1–10 | 46% (17/37) | [29.1–62.8] | 47.7% (61/128) | [38.9–56.4] | 0.854 |
10–19 | 2.7% (1/37) | [2.8–8.2] | 27.3% (35/128) | [19.5–35.2] | 0.001 |
21–29 | 5.4% (2/37) | [2.2–13.1] | 10.2% (13/128) | [4.8–15.5] | 0.376 |
≥ 30 | 8.1% (3/37) | [1.1–17.3] | 12.5% (16/128) | [6.7–18.3] | 0.461 |
Number of preoperative examinations | |||||
0–24% | 61.9% (13/22) | [39.2–84.6] | 41% (50/122) | [32.1–49.8] | 0.096 |
25–49% | 19% (4/22) | [0.7–37.4] | 36.9% (45/122) | [28.2–45.6] | 0.139 |
50–74% | 4.8% (1/22) | [5.2–14.7] | 13.1% (16/122) | [7.0–19.2] | 0.468 |
≥ 75% | 4.8% (1/22) | [5.2–14.7] | 4.1% (5/122) | [7.0–19.2] | 1.000 |
Unsure | 9.5% (2/22) | [4.2–23.2] | 4.9% (6/122) | [1.0–8.8] | 0.396 |
Quebec | France | p value χ2 test | |||
---|---|---|---|---|---|
Proportions | 95% CI | Proportions | 95% CI | ||
Breast MRI-guided biopsy availability | |||||
Yes | 42.9% (9/22) | [19.8–65.9] | 36.1% (44/122) | [27.4–44.7] | 0.552 |
Number of breast MRI-guided biopsies per week | |||||
< 5 | 100% (9/9) | [100–100] | 97.7% (43/44) | [93.1–100] | 0.648 |
Québec | France | p value χ2 test | |||
---|---|---|---|---|---|
Proportions | 95% CI | Proportions | 95% CI | ||
Auditing waiting time | |||||
Yes | 80% (16/21) | [60.8–99.2] | 68.1% (81/119) | [59.6–76.6] | 0.282 |
Average waiting time breast MRI | |||||
< 1 week | 0% (0/21) | [0–0] | 16.8% (21/119) | [10–23.6] | 0.048 |
1–2 weeks | 5% (1/21) | [5.5–15.5] | 44.6% (53/119) | [35.5–53.6] | 0.001 |
2–3 weeks | 25% (5/21) | [4.2–75.8] | 25.2% (30/119) | [17.3–33.1] | 0.984 |
> 3 weeks | 55% (11/21) | [31.1–78.9] | 12.6% (15/119) | [6.5–18.7] | < 0.0001 |
Unsure | 15% (3/21) | [2.1–32.1] | 0.8% (1/119) | [0.8–2.5] | < 0.0001 |
Waiting time breast MRI opinion | |||||
Adequate | 68.4% (13/19) | [45.4–91.4] | 72 % (85/118) | [63.8–80.2] | 0.746 |
Too long | 31.6% (6/19) | [8.6–54.6] | 28 % (33/118) | [19.7–36.2] | 0.746 |
Average waiting time preoperative breast MRI | |||||
< 1 week | 5% (1/21) | [5.5–15.5] | 40.3% (48/119) | [31.4–49.3] | 0.002 |
1–2 weeks | 40% (8/21) | [16.5–63.5] | 52.1% (62/119) | [43–61.2] | 0.317 |
2–3 weeks | 30% (6/21) | [8–52] | 6.7% (8/119) | [2.2–11.3] | 0.001 |
> 3 weeks | 10% (2/21) | [4.4–24.4] | 0% (0/119) | [0–0] | 0.001 |
Unsure | 15% (3/21) | [2.1–32.1] | 0.9% (1/119) | [0.8–2.5] | < 0.0001 |
Waiting time preoperative breast MRI opinion | |||||
Adequate | 85% (17/21) | [67.8–102.1] | 81.5% (97/119) | [74.4–88.6] | 1.000 |
Too long | 15% (3/21) | [2.1–32.1] | 18.5% (22/119) | [11.4–25.6] | 1.000 |
Québec | France | p value χ2 test | |||
---|---|---|---|---|---|
Proportions | 95% CI | Proportions | 95% CI | ||
Pathology (i.e., invasive vs. DCIS) | 78.3% (18/23) | [60–96.5] | 87.2% (109/125) | [81.3–93.1] | 0.259 |
Patient age | 52.2% (12/23) | [30.1–74.3] | 62.4% (78/125) | [53.8–71.0] | 0.356 |
Breast density | 47.8% (11/23) | [25.7–69.9] | 46.4% (58/125) | [37.5–55.3] | 0.900 |
Surgeon’s preference | 47.8% (11/23) | [25.7–69.9] | 21.8% (26/125) | [13.6–28.0] | 0.006 |
MRI availability | 13 % (3/23) | [1.85–27.9] | 4.8% (6/125) | [1–8.6] | 0.128 |
Other | 13 % (3/23) | [1.85–28] | 22.6% (27/125) | [14.3–28.9] | 0.348 |