LJUBLJANA, July 4 (Reuters) - Slovenian drug maker Krka KRKG.LJ said on Thursday group sales rose 6 percent to 597.1 million euros ($774.56 million) in the first half, mainly due to a steep increase in eastern Europe. It said sales in eastern Europe rose 26 percent, while sales in southeast Europe and in Slovenia fell 8 percent. Krka, Slovenia's largest listed company, is due to publish half-year profit figures on July 25. Krka shares had risen 0.8 percent to 50.7 euros by the close of trading on Thursday, before the sales figures were released, while the blue-chip SBI index .SBITOP lost 0.2 percent. The company also said its number of employees rose 4 percent to 9,839 in the past six months. ($1 = 0.7709 euros) (Reporting by Marja Novak; Editing by David Holmes) ((Marja.Novak@thomsonreuters.com)(+386-1-4700520)(Reuters Messaging: marja.novak.thomsonreuters.com@reuters.net)) Keywords: CLOVENIA KRKA/SALES