There are variable bio-markers used for detection of Ovarian Cancer:

the most common is CA-125 for early detection

Others include: Human Epididymis Protein 4, Mesothelin, human kallikrein, Human prostasin (PRSS8), Glutathione S-Transferase Polymorphisms, FOLR1 (folate receptor alpha, miRNA, ALDH1 (Aldehyde Dehydrogenase 1), IL-6 & IL-8  

For further reading this is a good source:

http://www.futuremedicine.com/doi/pdf/10.2217/whe.13.2

Another good source :

http://www.hindawi.com/journals/jo/2012/709049/

CA-125 is simple and inexpensive test.

In our hospital we investigate CA 125 and Roma index. 

Dear Colleague,

Good Day,

I am not a specialist in the field but I have few knowledge regarding this subject. I read a lot about it when I had to study it. 

please, see the following websites, the are very good.

http://www.ncbi.nlm.nih.gov/pubmed/19245589

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312922/

http://obstetricsgynecology.eu/articles/selected-ejog-papers/overview-biomarkers-ovarian-cancer-diagnosis

http://cebp.aacrjournals.org/content/21/11/1902.full

http://www.oriongenomics.com/products-biomarker-pipeline.html

http://www.hindawi.com/journals/jo/2012/709049/

http://www.annclinlabsci.org/content/40/3/218.full

http://www.medicalnewstoday.com/articles/291408.php

Thank you very much, all the best! Dr Mihaela Muntean

Thanks - some very interesting and useful articles there!

CA 12-5 is the best marker to detect ovarian cancer.

CA 125

CA 125 is the best marker to detect ovarian cancer. But I used to measure also CA 19.9, CEA and CA 15.3

Hi CA125 is the usual marker for Epithelial Ovarian Cancer (EOC) but CA19-9 is recommended also for mucinous  EOC.