<qa>  What is the effect of combining erlotinib with docetaxel?Phase III trial to study the effectiveness of combining erlotinib with docetaxel in treating patients who have locally advanced, recurrent, or metastatic head and neck cancer. Erlotinib may stop the growth of tumor cells by blocking the enzymes necessary for their growth. Drugs used in chemotherapy work in different ways to stop tumor cells from dividing so they stop growing or die. Combining erlotinib with docetaxel may kill more tumor cells. 