A public person is not owner as private individuals are. Their assets are public and no other criterion than the public figure of the owner is required, as well as their right to property, which is public-not private as that of Article 544 of the civil code - the exercise of which is immediately assigned to the satisfaction of the legitimate interests of their role. Therefore, specific patrimonial features which, certainly, have such a level of generality that their scope seems limited or their independence uncertain, are no less essential. It is through the prism of this public property right that tumor banks and biobanks will be approached.