Task: Answer Verification
Input (English): Question: Does dasatinib worsen the effect of cetuximab in combination with fractionated radiotherapy in FaDu- and A431-derived xenografted tumours?
Answer: In xenografts derived from these two cell lines, dasatinib did not improve the efficacy of cetuximab combined with radiotherapy. On the contrary, it worsened tumour control achieved by the combination of these two treatments.
Output (English): yes