ABSTRACT
Second to cardiovascular diseases, cancer is becoming one of the leading causes of death worldwide. In 2012, global estimates of new cancer cases were 14.1 million, while 8.2 million deaths occurred due to cancer. Lung and breast cancers are the most frequently occurring cancers in the world, causing enormous mortality in men and women, respectively. However, in more developed countries prostate cancer in men and lung cancer in women are the leading causes of cancer death. In the developing countries, men are most commonly diagnosed with lung, bronchus and tracheal cancers, while in women breast cancer is the most prevalent. Whereas the less developed countries
have a larger share in the world population, i.e. 82%, they only account for 57% of the estimated new cancer cases in the world. The burden of cancer is expected to grow worldwide, and especially in the economically weaker countries due to the adoption of lifestyle behaviors that are associated with increased risk of cancer. These include smoking, poor diet, lack of physical activity, and reproductive changes (Torre et al., 2015).
