<qa>  What is gemcitabine monotherapy considered to be?- Tumor type criteria;Histologically or cytologically confirmed diagnosis of solid tumor malignancy. Eligible are the cancers for which gemcitabine has been approved in 4-week schedule;1,000mgm2 weekly for 3weeks followed by 1 week rest at the 4th week, including non-small cell lung cancer, pancreatic cancer, biliary cancer, and urothelial cancer, to which gemcitabine monotherapy is considered to be appropriate 