Subgroup analysis revealed that SS was not associated with the risk of different molecular subtypes of breast cancer (luminal A-like, luminal B/HER2-positive-like, luminal B/HER2-negative-like, HER2-enriched-like and triple-negative breast cancer) or the histological subtypes of lung cancer (lung adenocarcinoma and squamous cell lung cancer). The gene discussed is ERBB2; the disease is squamous cell lung carcinoma.