Does QS cause cancer?
QS researchers believe that if there is any risk of cancer with QS, then the risk must be very small. Quinacrine has been used by more than 100 million people during its first 65 years of use, always in larger doses than for QS. There was never any mention that this drug might cause cancer because there was no link suspected, despite this enormous human experience. Not until 1993, when the fertility control potential of the drug became clearly documented, was the charge first made that QS may cause cancer. Although unproved scientifically, much media attention has unfortunately been given to the opposition and their accusations. Scientific evidence suggests that this method does not cause cancer. One study in Chile that has followed 1500 women for 19 years, has found no increase in the risk of cancer. A definitive answer awaits a much longer study in a much larger number of women.
