A method of reducing or abolishing dissemination of malignant cells into a blood and/or lymph vessel of a subject having a medical condition associated with malignant neoplastic tissue and subjected to a surgical procedure for removing at least a portion of said malignant neoplastic tissue, the method comprising administering to the subject, prior to, concomitant with or subsequent to the surgical procedure, a devitalizing effective amount of a compound which is 2,2-dichloropropanoic acid or a pharmaceutical acceptable salt thereof, by locally administering the compound onto and/or into said neoplastic tissue,
- wherein said salt does not comprise selenium.