TH and neoplasm: The results obtained from the use of STV in this model is shown in Fig. 2, panels E and F. NRTI in drinking water had a weak effect when administered in a prophylactic regimen, causing less than a 4-d-long delay in tumor development (from 42 to 46 d post-birth, on average) in Th-MYCN homozygous mice (Fig. 2E).