Abstract
No treatment has been established for meningeal carcinomatosis (MC) in advanced metastatic breast cancer, and its prognosis is poor. In recent years, systemic therapies such as trastuzumab deruxtecan and tucatinib have been reported effective for human epidermal growth factor receptor 2 (HER2)-positive breast cancer, however, these cannot be used for all MC. The difficulty in diagnosing and treating MC is attributed to its diverse pathology. As a result, in clinical practice, diagnosis is often delayed, and symptoms persist. This review focuses on whether neurological symptoms can be effectively alleviated even with unestablished treatments by classifying the pathology of MC into meningitis, hydrocephalus-related intracranial hypertension symptoms, focal brain damage such as epilepsy, cranial nerve disorders, and spinal cord symptoms and evaluating the diagnosis and condition. Hydrocephalus can be managed with drainage and ventriculoperitoneal shunt surgery, and meningitis symptoms and cranial nerve disorders can be managed with whole brain radiotherapy. Antiepileptic drugs are essential for epilepsy, and supportive care is necessary, as are steroids for cranial nerve disorders. However, MC is not caused by a single condition but can occur in combination thus the therapeutic effectiveness of palliative therapy for neurological symptoms is currently unknown, and research is limited. In the future, if a lineup of highly effective systemic therapies such as tyrosine kinase inhibitors for ALK gene-positive lung cancer is established, treatment strategies for MC may change. However at present, rapid diagnosis and prompt neurological palliative treatment play an important role in the neurological symptoms management of MC.