In the specific case of our study, the pre-processing phase consisted mainly of case-folding, stemming and stopwords removal.
However, data supporting this strategy are limited, consisting mainly of case series, retrospective data and experimental data.
Unfortunately the literature dealing with this topic is very sparse and consists mainly of case reports, case series, and a few retrospective studies.
As regards the imaging features of these tumours, a review of the literature reveals limited information, consisting mainly of case reports and review articles [2, 3, 5, 6, 8].
Previous studies have tried to identify whether Behçet's disease is associated with an increased risk of malignant disease, but the available literature, consisting mainly of case reports, suggests no significant association [63, 64].
In the case of diet and cancer, the results of early studies, mainly of case-control design, pointed toward the existence of relatively strong associations between certain components of diet and cancer risk.
Nevertheless, data concerning birth outcome in women with previous HD are sparse and consist mainly of case series (McKeen et al, 1979; Andrieu and Ochoa-Molina, 1983; Green and Hall, 1988; Aisner et al, 1993; Brierley et al, 1998).
After this initial peak, the incidence is low and will mainly consist of cases of neoplasia missed at screening.
Strikingly, when all 47 cases were subjected to unsupervised hierarchical clustering, two distinct groups emerged: one mostly comprised of Belarussian breast cancers and one mainly comprised of cases from WNY.
Retinoblastoma kindreds consist mainly of bilateral cases but there is evidence that some kindreds have a high proportion of unilateral cases.
