According to WHO, cancer deaths worldwide reached 7.9 million in 2007, accounting for about 13 percent of all deaths, while 30 percent of cancer deaths could have been prevented. WHO says that many cancers can be prevented and controlled by changing or avoiding major risk factors and by early detection and treatment. People should strongly avoid the following risk factors: overweight or obesity; low intake of fruits and vegetables; sedentary lifestyle; tobacco use; alcohol use; unsafe sexual practices; urban air pollution; indoor smoke from solid fuel use in the home; and injections contaminated with hepatitis B or C virus in health care facilities. In addition, vaccinations against HPV and hepatitis B virus infections, control of occupational hazards, and reduction of exposure to sunlight should be implemented. People should have regular checkups and learn to recognize the early signs of cancer and seek immediate medical protection for these symptoms. Some of the most common types of cancer, such as breast, cervical, rectal, colon and lung cancers, have high cure rates when detected early and treated according to best practices. In addition, palliative care can help relieve pain and other problems in more than 90 percent of cancer patients.