| abstract |
The invention concerns quinazoline derivatives of Formula (I) wherein each of R 1 , R 3 , R 20 , X 1 , X 2 , Z, W, (a) and (q) have any of the meanings defined in the description; processes for their preparation, pharmaceutical compositions containing them and their use in the manufacture of a medicament for use as an antiproliferative agent in the prevention or treatment of turnours which are sensitive to inhibition of erbB receptor tyrosine kinases, particularly EGFR tyrosine kinase. |