ERBB2 and cancer: The categorial clinical features in the data can take the following values: HER2: 0—HER2 negative, 1—HER2 positive; histological type: 1—NST, 2—lobular, 3—medullary, 4—other; progesterone status: 0—progesterone negative, 1—progesterone positive; mitotic index: number of mitoses; and cancer subtype: 1—TNBC, 2—LuminalA, 3—LuminalB, 4—HER2+.