New research published in the British Journal of Clinical Pharmacology suggests that long-term use of hormonal contraceptives creates a higher risk for glioma, CBS News reports. The Danish research team analyzed data on all Danish women aged 15 to 49 who developed glioma between 2000 and 2009. The findings revealed that women under 50 who had the brain cancer were 90 percent more likely to have been using some form of hormonal contraceptive for at least five years. Out of 317 glioma cases, nearly 60 percent of the women had used a contraceptive in the past. However, researchers noted that the study could not prove a cause-and-effect relationship, and an evaluation of the risks and benefits associated with hormonal contraceptives still favors their use.