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Here we demonstrate that bone marrow - derived haematopoietic progenitor cells that express vascular endothelial growth factor receptor 1 ( VEGFR1 ; also known as Flt1 ) home to tumour - specific pre - metastatic sites and form cellular clusters before the arrival of tumour cells .
 Anatomy: bone marrow - derived haematopoietic progenitor cells; Anatomy: tumour; Anatomy: pre - metastatic sites; Anatomy: cellular clusters; Anatomy: tumour cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: bone marrow - derived haematopoietic progenitor cells; Anatomy: tumour; Anatomy: pre - metastatic sites; Anatomy: cellular clusters; Anatomy: tumour cells