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Frequency of the detected sequence variants of the CHK2 gene in breast cancer and controls
| Sequence variant | Controls | Sporadic | BRCA2 999del5 |
| T59K | 0/904 | 1/146 | 0/74 |
| Exon 1 (delT) | 5/328 | 1/148 | 2/90 |
| Intron 2 (insA) | 38/344 | 21/130 | 14/78 |
| A252G | 5/344 | 0/130 | 1/74 |
The numbers stated refer to the number of chromosomes analysed.
