AUTHOR=Huang Yushan , Yang Guozi , Liu Miaomiao , Tai Panpan , Chen Xiao , Liu Min , Pan Zhenyu TITLE=Intrathecal administration of PD-1 inhibitor combined with pemetrexed for leptomeningeal metastases from breast cancer: a case report JOURNAL=Frontiers in Immunology VOLUME=Volume 16 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2025.1567324 DOI=10.3389/fimmu.2025.1567324 ISSN=1664-3224