Demographic and clinical features of the probands
| Probands with gastric cancer n=30* | Probands with breast cancer n=54* | Probands with other cancers n=7 | Probands with no cancer n=25 | |
| Average age at testing (SD) | 45 (17) | 54 (12) | 46 (14) | 46 (15) |
| Female | 22 | 54 | 6 | 15 |
| Ethnicity | ||||
| Caucasian | 20 | 38 | 4 | 17 |
| African American | 1 | 6 | 1 | 3 |
| Hispanic | 7 | 2 | 1 | 2 |
| Ashkenazi Jew | 2 | 1 | 2 | |
| Asian | 2 | |||
| Other | 1 | |||
| Unknown | 5 | 1 | ||
| Average age at diagnosis (SD) | 42 (16) | 50 (12) | 41 (13) | |
| Cancer type | ||||
| Lobular breast cancer | 26 | |||
| Ductal breast cancer | 18 | |||
| Mixed (lobular and ductal) | 3 | |||
| Diffuse/signet ring cell gastric cancer | 19 | |||
| Adenocarcinoma | 2 | |||
| Not provided | 9 | 6 | ||
| Colorectal | 4 | |||
| Ovary | 1 | |||
| Thyroid | 1 | |||
| Pancreas | 1 |
*The three cases with gastric and breast cancers are included in both categories.