AFP and breast cancer: Furthermore, p‐hTERT expression was correlated with the invasive type of lung adenocarcinoma (supplementary material, Figure S7A); serum levels of AFP, which is a representative oncofetal protein activated in liver cancer with stem cell properties (supplementary material, Figure S7B); and triple‐negative breast cancer, which is a highly aggressive form of breast cancer with stem cell properties (supplementary material, Figure S7C).