11102
Our data indicate that although PBSC harvests collected after consolidation chemotherapy are contaminated by leukemic cells , the degree of leukemic cell contamination decreases with repeated cycles of chemotherapy.
 PBSC, leukemic cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 PBSC, leukemic cells