cancer in the caspian littoral and north west area

studies undertaken during the last 5 years in the babol research station of the institute of public health research, teheran university, with the collaboration of the international agency for research on cancer in the caspian littoral and ardabil area in the north of iran has indicated the presence of cancer in 48 different sites. the five more prevalent types of cancer found in that area in order of their incidence are esophageal, stomach, skin, lung and liver cancers. except for cancer of esophagus which occurs with a very high variation in incidence in the area, the incidence of other 4 does not significantly differ in various parts of the region. the incidence of esophageal cancer is maximum in the east and southeast of the area and it gradually decreases towards the reaching its minimum level in gilan and increasing again to the west in ardabil area. the incidence is higher among males in the low incidence, almost equal in the high incidence area except in gombad area where is much higher among females than in males. the total number of cancer of soesophagus registered during the 5 years period is 1420 which constitute 1/10 of all cases reported. of other types of cancer registered, cancers of skin, cervix uteri and lymphoma, mostly lymphosarcoma are more prevalent. of the cancers of digestive tube, oesophageal is more prevalent in the east and stomach cancer in the west of the area.