nd serum carbohydrate antigen 125 (CA125) in the diagnosis of recurrent and metastatic ovarian cancers.
Methods:
A total of 101 consecutive patients with ovarian cancer who underwent
18
F-FDG PET/CT after cytoreductive surgery were chosen. The serum CA125 level was detected within one week before or after PET/CT examination. The gold standard of recurrence or metastasis was based on pathological results acquired from reoperation or biopsy. For the patients without pathological results
the long-term follow-up (at least 6 months) results were set as standard. All the data analyses were carried out by software package SPSS 18.0
and
P
0.05 was established as the threshold for significance.
Results:
The sensitivity
specificity
positive predicted value (PPV)
negative predicted value (NPV) and accuracyof PET/CT and serum CA125 for recurrence and metastasis was 94.1%
81.8%
91.4%
87.1%
90.1%
and 97.1%
12.1%
69.5%
66.7 %
69.3%
respectively. When the maximum standardized uptake value (SUV
max
) thresholds were set as 2.5 and 1.3
the corresponding diagnostic values were 94.1%
81.8%
91.4%
87.1%
90.1%
and 95.6%
84.8%
92.9%
90.3%
92.1%
respectively. When the thresholds were CA125 35 U/ml and CA125 65 U/ml
the corresponding values were 97.1%
12.1%
69.5%
66.7%
69.3%
and 88.2%
72.7%
87.0%
75.0%
83.2%
respectively. There was a linear relationship between SUV
max
and serum CA125 value (
R
2
= 0.595).
Conclusion:
Compared to serum CA125
18
F-FDG PET/CT is a useful technique to detect recurrent and metastatic ovarian cancer in terms of specificity and accuracy.