Epidemiological Study of Non-Melanoma Skin Cancers Qazvin Province, Iran

and statistical tests including t-test and chi-square tests. Results: Of the 484 patients, 294 (60.7%) were male and 190 (39.3%) were female. Most cases of carcinoma were found in basal cells (77.7%) and the rest of squamous cells. The most common sites of involvement were the head and scalp. The most frequent predisposing factors were working in the open air (70.7%), history of previous radiation for treatment of tenia capitis (26.1%), and chronic skin diseases such as burn eschar, chronic lesion, fistula and actinic keratosis (35.7%). The most prevalent Fitzpatrick skin phenotypes were II or III (75.4%). There were significant correlations between the incidence of NMSC and hookah smoking and oral contraceptive pill (OCP) consumption. Conclusions: Skin phenotypes II and III were the most common types found in the present study and this could be due to the higher frequency of these phenotypes among the study population. The lower incidence of NMSC in areas other than the neck and scalp could be associated with the importance of covering style used by the population under study. Known risk factors for the incidence of NMSC were also observed in the present study. A history of radiotherapy for treatment of tenia capitis was observed in a considerable percentage of patients, which could lead to the incidence of cancer several decades later. Further studies are needed to determine the role of hookah smoking and the use of OCP in the occurrence of NMSC.