Researchers have studied previous 36 studies having more 140,000 women participants around the world. And, after analyzing the data, the researchers said that women who use oral contraceptives in their reproductive years may have lasting endometrial cancer protection.

Study researchers said that every five years of taking birth control pills was linked with a 24% decline in the risk of cancer. The protection continued even more than 30 years after women stopped having the contraceptives.

Study's senior author Valerie Beral of Oxford University in the UK said that the study clearly shows that the protective effect of the pill of the endometrial cancer continued for more than 30 years. The researchers assessed data of 27,276 women who had the tumors and another 115,743 who did not have.

They drew data from previous studies including high-income nations, including the US, Europe, Japan, China, Australia and South Africa. In the assessment, around 50% of the women were at least 63 years of age.

Out of those who have been diagnosed with the cancer, one third of them had used birth control pills for around three years. Around 40% of women who did not get diagnosed with the cancer had taken the pills for more than four years.

Oral contraceptive was associated with 31% lower lifetime risk of developing endometrial carcinomas, 17% with lower risk of common sarcomas.

The US National Cancer Institute (NCI) said that the previous studies have also associated these pills with reduced risk of endometrial and ovarian tumors, but also with increased risk of breast, cervical and liver malignancies.

As per NCI, endometrial cancer happens to women when they are around 60 years of age, after the end of their reproductive years. The researchers said that in the 1960s, first oral contraceptive was introduced and around 400 million women in high-income countries alone have used the pills.