Shares of Varian Medical Systems ( VAR) were lower after the company suggested third-quarter results would beat Street estimates but said orders were flat in its North American oncology business.In a press release Wednesday, the company said it expects third-quarter earnings per share would be 30% higher than the 45 cents a share reported a year ago. That would result in earnings of 58 cents to 59 cents a share, higher than the consensus estimate of 55 cents a share. Varian expects third-quarter sales to rise 14%, suggesting $302.6 million, which is slightly below the consensus estimate of $309.9 million. Third-quarter net orders will rise 15% overall and 14% in its oncology systems business, despite roughly flat oncology orders in North America. The quarter-ending backlog is expected to rise about 14% over the backlog for the same time last fiscal year. Varian's shares were recently down $5.54, or 7.4%, to $69.85. The company will release its third-quarter results on July 29.