The differences between sarcoma and cancer are different origin tissues, different metastatic pathways, different pathological characteristics and different incidence rates. 1. Different origin tissues: sarcoma mainly originates from fat, muscle, lymphatic vessels, soft tissue, bone tissue, fibrous tissue and other mesenchymal tissues. Cancer mainly originates from epithelial tissue, for example, breast cancer originates from breast duct epithelial tissue. 2. Different metastatic pathways: sarcoma mainly metastasizes through blood channels, while cancer metastasizes mainly through lymphatic metastasis. 3. Pathology is especially different: sarcoma will be diffusely distributed in pathological examination, with soft texture, grayish-red color, unclear demarcation between mesenchyme and parenchyma, and reticulated fibers will also appear. Cancer is hard, grayish white in color, with clear demarcation between parenchyma and mesenchyme, and without reticular fibers. 4. Different incidence rates: sarcoma has a lower incidence rate and often occurs in children or young people. The incidence rate of cancer is higher, mostly seen in people over 40 years old. It is suggested that patients need to consult a doctor for examination in time, and the doctor will judge whether it is cancer or sarcoma according to the nature of the lesion.