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Background  Levothyroxine (LT 4 ) treatment can lead to iatrogenic hyperthyroidism and oxidative stress that can cause patient discomfort. Oxidative stress is also recognized as one of the causes of chronic diseases and cancer.    Methods  The prevalence of breast, colorectal, gastric and lung cancer in 18 Italian Regions during 2010 was correlated with the sales of LT 4  in 2009. The cancer prevalence was analyzed in women aged 30–84. This age range corresponds to more than 80% of the consumers of the drug and to about 99% of all malignant cancers. The correlation between sales of LT 4  and cancers was determined with the technique of Density Ellipses. The age and smoking contribution for lung cancer was determined with the Sequential test.    Results  No significant correlation was seen between LT 4  sales and breast, colorectal and gastric cancers. A significant correlation was instead found for lung cancer (p < 0.05) corrected for smoking and age.    Conclusions  LT 4  consumption in Italy is about 0.7 boxes/women/year. There is a correlation between lung cancer and LT 4  treatment and oxidative stress caused by LT 4  supplementation can be one of the causes. Although we cannot exclude that dysthyroidism needing LT 4  supplementation might be the ground for lung cancer itself and measuring oxidative stress could be helpful in avoiding excessive use of the drug.

Levothyroxine and lung cancer in females: the importance of oxidative stress