Age characteristics of incidences of prevalent cancers in the Aral Sea area of Kazakhstan.

The aim of the research was to examine age-specific features of incidence of cancer of the esophagus, lung, stomach, breast, cervix and thyroid gland in the Aral Sea area in Kazakhstan. A retrospective study of 11 years (1999-2009) was conducted using descriptive and analytical methods with calculated age incidence rates. The average age of patients with esophageal cancer and lung cancer had a tendency for increase with "aging", while in other cases "juvenation" was noted. The peak incidence of malignant tumors in general, and in the studied forms of cancer was found at 70 years of age or older, except for breast cancer and cervical cancer, where the peak incidence was found at 60-69 years. Trends in age-varied incidence rates had different tendencies in particular organ sites.

Trends of prevalent cancer incidences in the Aral-Syr Darya ecological area of Kazakhstan.

The aim of this research was to examine the incidence of major forms of cancer in the Aral-Syr Darya ecological area of Kazakhstan. The present retrospective study of 11 years (1999-2009) was therefore conducted using descriptive and analytical methods. Incidence rates (crude and standardized) of 11 leading cancer sites were calculated and trends determined. The result of analysis demonstrated the most common neoplams in the study region to be esophageal cancer, carcinoma of lung, stomach cancer, and breast cancer. Trends in incidence of cancers under study were different, the most marked reduction in cancer of esophagus is established (T=-6.1%) and revealed the high increase in breast cancer (T=+6.7%). In the dynamics the trend of malignant disease in general tended to decrease (T=-0.5%).