tokens: The NM23 gene has been proposed as a metastasis-suppressor gene , and its use has been suggested as prognostic factor .
folded_tokens: the nm23 gene has been proposed as a metastasis-suppressor gene , and its use has been suggested as prognostic factor .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-DNA_family_or_group I-DNA_family_or_group O O O O O O O O B-other_name I-other_name O