COMMENTARY: Link between HRT and breast cancer rates?

After reading this news article about research touting a link between hormone-replacement therapy and increased breast cancer rates, I can't help but doubt the veracity of this study (not uncommon with research studies. Always read with caution.) Before jumping on the blame-HRT bandwagon, why don't the researchers account for the possibility that the severe menopause symptoms could be linked to the increased risk and rates of breast cancer? This, rather than HRT being the cause of the cancer? The two issues - severe menopause symptoms and breast cancer rates - may not have separate factors.