UK researchers have developed a 3D laboratory model of human breast cancer, specifically ductal carcinoma in situ (DCIS). The model, complete with normal cells and tumor cells, should help experts understand how the disease develops in its early stages, and it could replace the need for experiments in animals.

About one in five breast cancers in the UK start out as DCIS. Researchers wanted to learn more about how the early cancerous changes in cells develop into larger tumors, and they chose to fashion a 3D test tube model because it is more complex than a layer of cells in a Petri dish.

Once this experiment is proved successful, it could reduce and perhaps replace animal studies.

"With breast cancer, there is an urgent need to move away from animal research models because their similarity to human cancer can be so poor," says one expert who explains this model could help revolutionize breast cancer research -- because unreliable research costs time, money, and lives, both animal and human lives.

Chloe is a little girl conceived through in vitro fertilization -- not because her parents could not conceive in the traditional manner but because they wanted to make sure Chloe had no predisposition to cancer in her genetic makeup. And in vitro fertilization is one method of almost ensuring this. There is still a three percent chance of failure but Chloe's parents felt confident in the elective process that would mostly prevent her from inheriting a genetic mutation for colon cancer that has devastated her family -- Chloe's father carries this mutation, and his mother, grandfather, and two uncles have all died from colon cancer.

A growing number of couples are using preimplantation genetic makeup to detect a predisposition to cancers that may or may not develop later in life. Using this procedure, parents subject their tiny embryos to genetic tests to determine whether or not they harbor defective genes. Essentially, parents get to pick and choose from embryos in a petri dish which one they want. Since the embryo that became Chloe did not test positive for any defective genes, she was the chosen one. And she is now a healthy two-year-old girl.

It's an ethical minefield -- this scientific creation of human life and the picking and choosing of which embryos will survive and which ones will not. One expert says the issue centers around what is considered serious enough to warrant such testing -- and who gets to make this decision. Ethical dilemmas surrounding this issue will only continue to grow as more and more options become available. Already embryos are tested for predisposition for obesity and deafness and a mild skin condition. Some clinics even screen for gender. Some fear this practice may lead to a genetic class divide where the wealthy will become more genetically pure than the poor -- because this process is difficult and expensive, costing tens of thousands of dollars without insurance coverage.

Chloe's parents are happy they made the choice they did. Her father says he doesn't know if he could handle being told his daughter has cancer -- especially with the knowledge that he could have prevented it.