A primary tumor is one that originates in a primary embryonic germ layer such as mesoderm,endoderm,or ectoderm.

Name: A primary tumor is one that originates in a primary embryonic germ layer such as mesoderm,endoderm,or ectoderm.
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A primary tumor is defined as the original tumor that forms at the initial site of cancer development, not specifically related to originating from primary embryonic germ layers.

A Primary Tumor Is One That Originates in a Primary