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The concept of CSC makes perfectly clear how researches and therapeutics strategies, while both in crisis since the 90s’, were standing on the same paradigmatic structure (the cancer cell). This concept, still restricted to the fundamental research, offers a profound theoretical renewal of the carcinogenesis.Moreover, the CSC concept is a good opportunity to reexamine the foundations of the well-known concept of “stem cell” or, more precisely, of “stemness”. With the CSC, the stemness is confronted to the question of the relationship between pathological and healthy among the functions of life.