Research on two continents signaled more bad news for menopause hormones,offering the strongest evidence yet that they can raise the risk of breast cancer and are tied to a slightly higher risk of ovarian cancer.New US government numbers showed that breast cancer rates levelled off in 2004 after plunging in 2003-the year after millions of women stopped taking hormones because a big study tied them to higher stroke and breast cancer risks.Experts said the levelling off shows that the 2003 drop in the cancer rate was real and not a fluke.The trend was even stronger for the most common form of the disease-tumours whose growth is fuelled by hormones.