<unk> s are classified by the type of cell that the tumor cells resemble and is therefore presumed to be the origin of the tumor. These types include: *<unk> rcinoma:<unk> s derived from epithelial cells. This group includes many of the most common<unk> s and include nearly all those in the breast, prostate, lung, pancreas and colon. * Sarcoma:<unk> s arising from connective tissue (i.e. bone,<unk> rtilage, fat, nerve), each of which develops from cells originating in mesenchymal cells outside the bone marrow. * Lymphoma and leukemia: These two classes arise from hematopoietic (blood-forming) cells that leave the marrow and tend to mature in the lymph nodes and blood, respectively. * Germ cell tumor:<unk> s derived from pluripotent cells, most often presenting in the testicle or the ovary (seminoma and dysgerminoma, respectively). * Blastoma:<unk> s derived from immature "precursor" cells or embryonic tissue.<unk> s are usually named using -carcinoma, -sarcoma or -blastoma as a suffix, with the Latin or Greek word for the organ or tissue of origin as the root. For example,<unk> s of the liver parenchyma arising from malignant epithelial cells is<unk> lled hepatocarcinoma, while a malignancy arising from primitive liver precursor cells is<unk> lled a hepatoblastoma and a<unk>  arising from fat cells is<unk> lled a liposarcoma. For some common<unk> s, the English organ name is used. For example, the most common type of breast<unk>  is<unk> lled ductal<unk> rcinoma of the breast. Here, the adjective ductal refers to the appearance of<unk>  under the microscope, which suggests that it has originated in the milk ducts. Benign tumors (which are not<unk> s) are named using -oma as a suffix with the organ name as the root. For example, a benign tumor of smooth muscle cells is<unk> lled a leiomyoma (the common name of this frequently occurring benign tumor in the uterus is fibroid). Confusingly, some types of<unk>  use the -noma suffix, examples including melanoma and seminoma. Some types of<unk>  are named for the size and shape of the cells under a microscope, such as giant cell<unk> rcinoma, spindle cell<unk> rcinoma and small-cell<unk> rcinoma. File:Breast<unk>  gross appearance.An invasive ductal<unk> rcinoma of the breast (pale area at the center) surrounded by spikes of whitish scar tissue and yellow fatty tissue File:Colon<unk>  2.An invasive colorectal<unk> rcinoma (top center) in a colectomy specimen File:Lung<unk> .A squamous-cell<unk> rcinoma (the whitish tumor) near the bronchi in a lung specimen File:BreastCancer.A large invasive ductal<unk> rcinoma in a mastectomy specimen
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