The CA125 test is unreliable. There are too many false positives / elevated results when there is no cancer. A friend and I had the exact same type of benign ovarian cyst / tumor (per biopsy / pathology) and her CA125 was well over 1000 while mine was in the normal range (around 30).
Sadly, our organs were removed despite the frozen section done in the operating room being benign. Gynecologists remove women's organs far more often than is necessary. Only about 10% of female organ removal surgeries (hysterectomies and oophorectomies) are done for a cancer diagnosis.