Interview with David Zava, Ph.D. David Zava, Ph.D. is a biochemist and an experienced breast cancer researcher who has spent decades in the laboratory. He is the laboratory director of ZRT Laboratory in Portland, OR, which does state-of-the-art saliva hormone assay testing. Over the past few years, Dr. Zava has contributed much to Dr. Lee’s knowledge and understanding of progesterone, estrogen and breast cancer, and we’re always intrigued to know what’s on his mind. This interview was originally published in the John R. Lee, M.D. Medical Letter JLML: Dr. Zava, I know you’re concerned about the future health of teenage girls because they are reaching puberty earlier and thus tend.
Your best choice depends on you. For some women, the convenience of birth control pills or patches may outweigh the side effects and health risks that go with them. At the other end of the spectrum, women in stable relationships, with regular menstrual cycles and good body awareness may want to consider using the “rhythm method,” also known as “natural family planning” and “fertility awareness.” In between the extremes of synthetic hormone contraceptives and the rhythm method are condoms, diaphragms, cervical caps, female condoms and the Today Sponge. All three involve spermicide, which is not the healthiest goop you can put in your body, but again, risks need to be.
Progesterone Vs. Progestins in Monkeys Wood CE, Register TC, “Effects of estradiol with micronized progesterone or medroxyprogesterone acetate on risk markers for breast cancer in postmenopausal monkeys,” Breast Cancer Res Treat (2007) 101:125–134 This is an important, even landmark study, not in the sense of bringing us new information, but in confirming what’s already known but not substantially proven in published research to the satisfaction of those who don’t quite grasp yet how safe and effective progesterone is in hormone replacement therapy. Macaque monkeys are about as close as it can get to reproducing in animal research what will happen in humans. The goal of this study was to compare.