Glass tea cups are exactly what they sound like: tea cups made out of glass. Most are clear, but they can have prints on the glass that give it a more decorative feel. Even without the prints, a plain clear tea cup has a very delicate, elegant appearance.
Most people are scared stiff of contracting cancer. That is perfectly understandable - who wants to spend a couple of years undergoing chemotherapy only to die a few years later? Or even if you recover it is a few years out of your life that have been worrying and gruelling. And not just for the patient but for friends and family as well.