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article_metadata: 10.3389/fonc.2021.651723
article_metadata: Front Oncol
article_metadata: 2021 Oct 7;11:651723.
article_metadata: cdk4/6 inhibitor bone marrow metastasis breast cancer case report endocrine therapy visceral crisis
article_metadata: CC BY
article_metadata: https://pubmed.ncbi.nlm.nih.gov/34692469/
article_metadata: Case Reports
article_metadata: PMC8529000
article_metadata: 34692469
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article_metadata: 2021