28 In a study on 209 countries of the world in 2019, the rate of skin cancer was higher in older people, and an increasing trend of cancer was observed especially for areas that encompass people aged 55 years. 29 In a 30-year study in Hong Kong, demographic factors were reported to be pivotal in the rising incidence of NMSC in Hong Kong.
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Incidence Rates and Time Trends of Skin Cancer in Golestan Province, Northeastern Iran, 2005-2018.
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7 , 32 Despite the increasing trend of NMSC in most parts of Iran, a study based on the cancer registration statistics of Iran reported a decreasing trend for skin cancer during 2000-2016, making skin cancer the second most common cancer in Iran.