Insulin resistance (IR) is a condition where cells respond poorly to insulin, leading to increased insulin levels (hyperinsulinemia). This condition is linked to obesity, type 2 diabetes (T2DM), and cancer. Obesity and T2DM are risk factors for cancer initiation, progression, and metastasis. IR is associated with poor cancer outcomes, including higher recurrence rates and reduced survival. The mechanisms linking IR to cancer involve dysregulated systemic factors such as insulin, insulin-like growth factors (IGFs), glucose, lipids, and inflammatory cytokines. IR is also linked to increased cancer risk through mechanisms involving insulin and IGF signaling pathways, which promote cell growth and proliferation. Genetic factors, such as mutations in the insulin receptor (INSR) gene, can cause severe IR syndromes. Environmental factors like obesity, aging, and certain drugs also contribute to IR. IR is associated with various cancers, including breast, thyroid, and colon cancers. Obesity increases cancer risk through mechanisms such as increased insulin and IGF levels, chronic inflammation, and altered lipid metabolism. The relationship between IR and cancer is complex, involving multiple pathways and factors. Understanding these mechanisms is crucial for developing strategies to prevent and treat cancer in individuals with IR.Insulin resistance (IR) is a condition where cells respond poorly to insulin, leading to increased insulin levels (hyperinsulinemia). This condition is linked to obesity, type 2 diabetes (T2DM), and cancer. Obesity and T2DM are risk factors for cancer initiation, progression, and metastasis. IR is associated with poor cancer outcomes, including higher recurrence rates and reduced survival. The mechanisms linking IR to cancer involve dysregulated systemic factors such as insulin, insulin-like growth factors (IGFs), glucose, lipids, and inflammatory cytokines. IR is also linked to increased cancer risk through mechanisms involving insulin and IGF signaling pathways, which promote cell growth and proliferation. Genetic factors, such as mutations in the insulin receptor (INSR) gene, can cause severe IR syndromes. Environmental factors like obesity, aging, and certain drugs also contribute to IR. IR is associated with various cancers, including breast, thyroid, and colon cancers. Obesity increases cancer risk through mechanisms such as increased insulin and IGF levels, chronic inflammation, and altered lipid metabolism. The relationship between IR and cancer is complex, involving multiple pathways and factors. Understanding these mechanisms is crucial for developing strategies to prevent and treat cancer in individuals with IR.