@ldntoparis22 All ovarian cancers are epithelial.
With the exception of sarcomas, all solid tumours are epithelial meaning they originate in the lining (internal or external) of the organ, so in other words, 90% of all cancers are epithelial and then you have the blood cancers, sarcomas and lymphomas.
Invitae is the biggest genetic testing provider in the US and the one used by most hospitals
https://www.invitae.com/en/providers/test-catalog/test-01204 . Have a look at https://myriad.com/gene-table/ as well
I am extremely sorry for your mother. There is no optimal screening so far, reason why genetic testing is a great opportunity . If you were to test positive for a mutation, you have several options. First, if you are done having kids, you could remove your Fallopian tubes. 90-95% of ovarian cancers actually originate in the Fallopian tubes.
Once you are in menopause, you can remove fallopian and ovaries.
Then lifestyle, lifestyle and lifestyle. Even for BRCA1 and BRCA2 , there are programs for women who don't want to take surgery route.
@waterlego Your genetic counsellor should have mentioned the CDH1 gene, especially with early onset. Yes, your mother and grand mother might have shared habits or traditional foods (salted or smoked fish in abundance? preserved meats and vegetables in large quantities?), but this is less likely than having a CDH1 mutation. In addition to this one, other genes might also give a predisposition .
You could also test for Helicobacter pylori, it is a breath test. This bacteria can cause stomach cancer and it can be shared in the same family, especially if they live together. In a way, Helicobacter pylori runs in families, even if not technically genetic. Once you have a pylori infection , it can go undetected for years and years. Easy to treat and eradicate with antibiotics.