Cat cancer symptoms may lead to the development of some tumors dangerous for cats. There is a tumor called fibrosarcoma or soft tissue sarcoma. This tumor is developing in the connective tissue or in the muscle of the body. Hence it is often associated with vaccinations and injections – the term for this is injection-site sarcoma. Much less common tumor caused by cancer is brain tumor, nasal tumor, liver tumors, and lung tumors as well as mammary tumors. Since a developing tumors stand in the way of the normal circulation, they lead to the emergence of obstacles for the normal energy delivery system.