The 2 main types of cells covering the cervix are squamous cells and glandular cells. The place where these 2 cell types meet is called the transformation zone. Most cervical cancers start in the transformation zone. Most cervical cancers begin in the cells lining the cervix. These cells do not suddenly change into cancer. Instead, the normal cells of the cervix first gradually develop pre-cancerous changes that turn into  cancer. Although cervical cancers start from cells with pre-cancerous changes, only some of the women with pre-cancers of the cervix will develop cancer. The change from cervical pre-cancer to cervical cancer usually takes several years, but it can happen in less than a year. For most women, pre-cancerous cells will go away without any treatment. Still, in some women pre-cancers turn into true cancers.

I would like to suggest a documentary - "Trial & Error" which explores that India is a favored outsourcing destination for the western world. While we outsource almost anything under the sun for them, we also outsource the much debated "clinical trials".

To watch please visit - http://www.cultureunplugged.com/play/4031