You must submit your correlations or covariances into a com-. puter program to extract your factors. This step is too complex to reasonably be done by hand. There. are a number of diï¬erent extraction methods, including maximum likelihood, principal component, and principal axis extraction. The best method is generally maximum likelihood extraction, unless you. seriously lack multivariate normality in your measures.
However the incidence of malignancy (invasive or in situ) as a cause of PND varies between 1 and 23% depending upon the series studied [3]. A solitary papilloma is not thought to be a pre-malignant lesion [5] and is considered by some to be an aberration rather than a true disease process [6].
Papillary breast cancer is a very rare type of invasive ductal breast cancer that accounts for fewer than 1% of all breast cancers. The name comes from finger-like projections, or papules, which are seen when the cells are looked at under the microscope. Many papillary tumors are benign. These are called papillomas. Even when a biopsy is negative for cancer, the pathologist often needs to look at the whole tumor under the microscope to be sure about the diagnosis. This is why surgery to remove a papilloma is usually recommended, even if it is thought to be benign.