Final answer:
Carcinoma is the malignant tissue that accounts for 80-90% of all cancers, arising from epithelial cells. These cells are pervasive throughout the body, leading to carcinomas being the most common and frequently deadly form of cancer, with breast, prostate, lung, and colon cancer as examples.
Step-by-step explanation:
The malignant tissue that accounts for 80-90% of all cancers is Carcinoma. Carcinomas are cancers that arise from epithelial cells, which are found in the tissue that lines the inner and outer surfaces of the body. These cells cover the surface of the skin, the airways, the digestive and urogenital tracts, and form the lining of the hollow organs of the body. Owing to their widespread presence in the body, it is not surprising that carcinomas are the most common form of cancer.
Examples of carcinomas include those affecting the breast, prostate, lung, and colon, which are among the types of cancer causing the majority of cancer deaths. Although basal cell carcinoma, a type of skin cancer, is extremely common, it is usually less deadly and makes up a significant percentage of all new cancers each year in the United States.