Table 2. Comparison of frequency of disease recurrence after potentially curative operation according to pre- and postoperative levels of serum CYFRA 21-1.
|
Serum CYFRA 21-1 (ng ml−1) |
Number of patients |
||||
|---|---|---|---|---|---|
| Group | Preoperation | Postoperation | Recurrence | No recurrence | Total |
| A | <2 | <2 | 5 (6.0%) | 79 | 84 |
| B | >2.1 | <2 | 6 (20.7%) | 23 | 29 |
| C | >2.1 | >2.1 | 2 (66.6%) | 1 | 3 |
According to serum CYFRA 21-1 levels at pre- and postoperation, the patients were divided into groups A, B, and C.
Frequencies of recurrences were different between A and B (P=0.0312), A and C (P=0.0162), and A and B+C (P=0.007), but not B and C (P=0.1468), examined by χ2 test (Fisher's exact method).