Table 1.
Differences in the investigated quantitative values between the invasive ductal and lobular breast carcinomas: the statistical analysis was done with the Mann–Whitney U test.
| Histological types | N | Arithmetic mean | Standard deviation | Min | Max | Percentiles | P value | |||
|---|---|---|---|---|---|---|---|---|---|---|
| 25 | Median | 75 | ||||||||
| Age (years) | Ductal carcinoma | 30 | 65.13 | 14.98 | 37 | 87 | 55.00 | 67.00 | 77.75 | 0.096 |
| Lobular carcinoma | 30 | 59.63 | 11.99 | 36 | 77 | 50.75 | 63.50 | 69.50 | ||
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| Tumor size (cm) | Ductal carcinoma | 30 | 3.89 | 1.59 | 1.20 | 8.50 | 2.50 | 3.65 | 5.05 | 0.002 |
| Lobular carcinoma | 30 | 2.77 | 1.90 | 0.70 | 8.00 | 1.50 | 2.00 | 3.28 | ||
|
| ||||||||||
| Total number of lymph nodes | Ductal carcinoma | 30 | 10.80 | 4.48 | 4 | 21 | 6.75 | 11.00 | 14.00 | 0.006 |
| Lobular carcinoma | 29∗ | 14.45 | 4.59 | 8 | 26 | 10.50 | 13.00 | 17.00 | ||
|
| ||||||||||
| Number of positive lymph nodes | Ductal carcinoma | 30 | 5.27 | 3.48 | 1 | 13 | 2.00 | 4.00 | 8.00 | 0.035 |
| Lobular carcinoma | 29∗ | 4.90 | 7.26 | 0 | 25 | 0.00 | 2.00 | 6.00 | ||
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| ||||||||||
| Percentage of positive lymph nodes (%) | Ductal carcinoma | 30 | 50.92 | 28.66 | 5.26 | 100.00 | 26.70 | 46.43 | 77.00 | 0.007 |
| Lobular carcinoma | 29∗ | 30.58 | 36.72 | 0.00 | 100.00 | 0.00 | 11.76 | 53.57 | ||
∗For one invasive lobular carcinoma, the number of the total isolated and positive lymph nodes was not known (Nx).