Nikkei falls as investors retreat ahead of Chinese economic data

* Nikkei slips as investors step back after Monday's buying * Investors cautiously wait for China's growth figures * Fujifilm shares advance on Ebola drug announcement By Thomas Wilson TOKYO, Oct 21 (Reuters) - Japanese stocks skidded on Tuesday as investors took a step back after the heavy buying seen on Monday and nervously waited for data on the Chinese economy. The Nikkei share index fell 0.5 percent by 0127 GMT to 15,026.47. Investors looked past solid advances on W