14.4 Providing guidance on steps to investigate and confirm the imputability of malignancy transmission

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 attributability in the context of malignancy transmission is definite (certain), likely (probable), possible, unlikely or excluded. Although allowing for the specific peculiarities every case has, developing an objective and universal scale to help assess attributability is needed. However, this does not preclude the description of the steps that should be followed in case of a suspected malignancy transmission occurs, in order to assess attributability.