Except for the scale developed by the Disease Transmission Advisory Committee in the United States, no common and objective criteria are being applied to consider whether imputability in the context of malignancy transmission is definite (certain), likely (probable), possible, unlikely or excluded. Although it is recognized that each case has its own peculiarities, the development of an objective and universal scale to help assess imputability is needed. However, the lack of a comprehensive scale does not preclude the description of the steps that should be followed in the case of a suspected malignancy transmission in order to assess imputability.
