The present invention relates to a method of preventing, treating or inhibiting the development of tumors or metastases in a subject and to an immunomodulator for use in such therapy, in combination with a chemotherapeutic agent. An aspect the present invention is a method of preventing, treating, reducing, inhibiting and/or controlling the formation or establishment of metastasis of a primary neoplasia, tumor or cancer at one or more sites distinct from a primary neoplasia, tumor or cancer, in a subject intended to undergo chemotherapy, wherein the method comprises administering to the subject, a therapeutically effective amount of an antimetabolite pyrimidine analogue and an immunomodulator.
