Inhibition of mitochondrial protein synthesis by doxycycline (DC), a tetracycline analogue, has significant antitumor effects in several tumor systems. In the present study, the effects of continuous DC treatment combined with intermittent administration of Adriamycin or 1-beta-D-arabinofuranosyl cytosine on the growth of a rat leukemia were investigated. The presence of DC retards tumor relapse after 1-beta-D-arabinofuranosyl cytosine or Adriamycin treatment significantly. DC may therefore be of value in several modalities of antitumor treatment.
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