This study aims to evaluate if a light based technique, called Transillumination Breast Spectroscopy (TIBS), can be used to construct a non-invasive breast cancer risk predictor which provides a better odds ratio than mammographic parenchymal density.
Inclusion Criteria: * Are in good health and capable of providing consent * Are willing to come in to the Princess Margaret Hospital for a single visit to meet with a female research assistant Exclusion Criteria: * Have had breast augmentation or reduction * Have a personal history of breast cancer * Have had a previous bilateral fine needle aspiration or core biopsy * Have a breast tattoo