The investigators found a greater proportion of fibrous tissues, compared with smooth tissues, in the large tumors than in smaller tumors. The large tumors were the fastest growing, suggesting that connective tissue contributes to tumor growth rather than regression. The vascularity varied as well—the fibroids had fewer blood vessels compared with normal tissue, but the fibroid tissue bled more. Larger fibroids had a larger total area of vascularity, but the smaller fibroids had a larger cross-section of blood vessels.
Ultimately, these results and future analyses might help physicians develop a model that they can use to predict fibroid growth over time, Dr. Davis noted.