Copyright information:Taken from "Obesity promotes 7,12-dimethylbenz()anthracene-induced mammary tumor development in female zucker rats"Breast Cancer Research 2005;7(5):R627-R633.Published online 6 Jun 2005PMCID:PMC1242129.Copyright © 2005 Hakkak et al.; licensee BioMed Central Ltd. Body weights of lean and obese female rats. Mammary tumor incidence (percentage of rats with tumors) in female rats. Dashed lines indicate the post-DMBA (7,12-dimethylbenz()anthracene) days at which 25% of the obese and lean rats developed at least one mammary tumor. Mammary tumor multiplicity in obese and lean rats.