Breast cancer risks following antipsychotic use in women with bipolar disorder versus schizophrenia: A territory-wide nested case-control study spanning two decades

•A territory-wide public healthcare database was used to conduct a nested case-control study on breast cancer risks.•Increased risk followed typical antipsychotic use in both women with schizophrenia and bipolar disorder.•Increased risk following atypical antipsychotic use was observed only in women with bipolar disorder.•More research is needed to evaluate risks and benefits associated with antipsychotics in women with bipolar disorder.