Last updated on June 12, 2021 at 11:26
Tumour markers of malignant ovarian cancer
Tumour markers in ovarian cancer are not used for diagnosis but rather for preoperative evaluation and follow-up. They’re not appropriate for screening of the general population.
Several biomarkers are available for ovarian cancer:
- CA 125
- HE4 (human epididymis protein 4)
Of these, CA 125 is the most widely used. Up to 80% of endothelial ovarian cancers will have elevated CA 125. It’s elevated if > 35 units/mL. It’s specificity for ovarian cancer is relatively higher in postmenopausal women than premenopausal.
CEA can be elevated in many conditions other than ovarian cancer, benign and malignant, including GI tract cancer, smoking, liver disease, gallbladder disease, IBD, etc.
β-hCG and AFP are mostly elevated in germ cell tumours and choriocarcinoma.
Inhibin is only elevated in sex cord-stromal tumours. Oestrogens and androgens could be elevated in these tumours as well.
Several biomarker panels, which measures multiple biomarkers, are available. These use multiple biomarkers to assess the likelihood of malignancy in patients with adnexal mass. Combining biomarkers makes them more sensitive and more specific.
- ROMA index is the most important and uses two biomarkers
- CA 125 and HE4
- OVA1 uses five biomarkers
- Overa uses five different biomarkers
Borderline ovarian cancer
Definition and epidemiology
Borderline ovarian tumours are tumours which have atypical epithelial proliferation but no stromal invasion. They sometimes have intraperitoneal spread.
They are a type of ovarian epithelial tumours, and the borderline ones account for 15% of these tumours.
Borderline tumours have an excellent prognosis.
The histological types are as for other epithelial ovarian tumours:
- Serous type
- Mucinous type
- Clear cell
- Brenner tumour
The serous and mucinous types are the most frequent.
The FIGO classification is used for staging. It’s the same as for other ovarian tumours (topic A11).
Most patients present with an asymptomatic adnexal mass which is discovered on bimanual examination or on ultrasound. Sometimes, patients present with abdominal or pelvic pain or dyspareunia.
Diagnosis and evaluation
Evaluation is as for other ovarian tumours (topic A11). There’s nothing in particular which can distinguish borderline tumours from other tumours clinically. The diagnosis is made pathologically, after surgery.
The definite diagnosis, staging, and treatment are based on surgery. Frozen section is commonly performed intraoperatively, and the information is used to help determine the extent of the surgical procedure.
Stage I borderline tumours can be treated with unilateral salpingo-oophorectomy, and pelvic washing.
Stage II and beyond are treated with bilateral salpingo-oophorectomy and total hysterectomy.
During laparoscopy or laparotomy, the peritoneal cavity should be inspected for possible metastases, and biopsy should be performed if present. Metastases should be resected.
B24. Gonadal ovarian tumors
B26. Malignant ovarian cancer; operative treatment, chemo- and radiation therapy