The Queensland Institute of Medical Research (our very own QIMR) does great research in this area:

[url=http://www.qimr.edu.au/page/News__Events/Media_Centre/Media_Releases/Archive/2003/QIMR_study_proves_]Ovarian cancer symptoms[/url]

[url=http://www.qimr.edu.au/page/News__Events/Media_Centre/Media_Releases/Archive/2010/Meat_fish_and_ovarian_cancer_risk/]
Processed meat and ovarian cancer[/url]
“Our research suggests that women who eat processed meat several times a week have about a 20% higher risk of developing ovarian cancer than women who eat processed meat less than once a week” said Dr Webb who heads the Gynaecological Cancer Group at QIMR.

“Conversely it appears that women who eat more poultry and fish may have a 10-15% lower risk of developing ovarian cancer than those who eat less poultry or fish.”

The study combined new results from two Australian studies (including data from over 4000 women) with the results from other studies conducted around the world.

[url=http://www.qimr.edu.au/page/News__Events/Media_Centre/Media_Releases/Archive/2010/Drinking_tea_may_r]
Drinking tea may reduce risk of ovarian cancer[/url]
Researchers from the Queensland Institute of Medical Research (QIMR) have found that drinking tea may decrease your risk of developing ovarian cancer.

Lead researcher Dr Christina Nagle from QIMR’s Gynaecological Cancer Group said “Our results indicate that drinking more than four cups a day of black green or herbal tea may reduce ovarian cancer risk by almost 30%.”

[url=http://www.qimr.edu.au/page/News__Events/Media_Centre/Media_Releases/Archive/2002/World-first_QIMR_study_links_smoking_to_ovarian_cancer/]Smoking and ovarian cancer[/url]
An extensive research study by The Queensland Institute of Medical Research found that women who smoke have a 50% higher risk of ovarian cancer than those who don’t smoke.

The scientists used data collected from women in Queensland NSW and Victoria – 794 with ovarian cancer and 855 without – between 1990 and 1993.

“Many other cancers are linked to smoking – pancreas bladder kidney and cervical cancer. In our study we did not start by hypothesising a link between smoking and ovarian cancer and were pretty surprised by the results ourselves” he said.

Talcum powder and ovarian cancer
Women who use talcum powder and who have not had a tubal ligation or hysterectomy have a 30% higher risk of ovarian cancer.