Breakdown of VYOC cases by histological subtype
| Histological subtype | n (%) | Carriers of PV detected (%) | PV details |
| HGSOC | 6 (7.8) | 0 | NA |
| LGSOC | 4 (5.2) | 0 | NA |
| Poorly differentiated | 1 (1.3) | 0 | NA |
| Serous NOS | 12 (15.6) | 1 (8.3) | MSH2x1 |
| Endometrioid | 7 (9.1) | 2 (28.6) | MSH2x1, PMS2x1 |
| Clear cell | 2 (2.6) | 1 (50) | MSH2x1 |
| Mucinous | 29 (37.7) | 0 | NA |
| Borderline | 9 (11.7) | 0 | NA |
| Granulosa cell | 1 (1.3) | 0 | NA |
| Adenocarcinoma NOS | 1 (1.3) | 0 | NA |
| Unknown | 5 (6.5) | 1 (20) | MSH2x1 |
| Total | 77 | 5 (6.5%) | MSH2x4, PMS2x1 |
HGSOC, high-grade serous ovarian cancer; LGSOC, low-grade serous ovarian cancer; NA, Not Applicable; NOS, not otherwise specified; PV, pathogenic variant; VYOC, very young onset ovarian cancer.