When Roche Holding executives held an

investor-day briefing in New York in March, Morgan Stanley analyst Andrew Baum had a question that had nothing to do with new drugs, licensing deals or health care legislation: Did the Genentech team hide the ties of the Roche executives?

Richard Scheller, a veteran scientist at Genentech, the biotechnology powerhouse Roche took over last year for $46.8 billion, quipped that he doesn't own one. Turns out his Roche colleagues on the stage, led by Chief Executive Officer Severin Schwan, didn't want him to look out of place so they ditched theirs.

"I'd never seen them without suits and ties before," Baum said. To him, the informal attire "reflected the willingness of Roche to be seen to bend toward Genentech, rather than the other way around."

Genentech's impact on the Swiss drugmaker goes beyond the wardrobe of its executives. Unlike many acquired companies, the biotech leader is retaining its culture even though it's under new ownership.

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Roche has placed Genentech scientists in key jobs, such as head of drug development for the combined company. The U.S. operations of Roche, based in Basel, Switzerland, bore the brunt of job cuts after the merger, and Genentech's research structure has been adopted across the company. Meanwhile, at Genentech's base - 1 DNA Way in South San Francisco - employees say not much has changed.

"Success ultimately equates into power, and that's exactly what we are seeing at Roche/Genentech," said Jörg de Vries-Hippen, chief investment officer for European equities at Allianz Global Investors in Frankfurt. "Now that the full integration has taken place, it's the Genentech guys being promoted and getting the key positions."

Besides the billions it spent to buy Genentech, Roche has another reason to handle the biotech company carefully: its lucrative cancer drugs. Three of Genentech's cancer therapies - Avastin, Rituxan and Herceptin - together logged sales of $15.36 billion last year, topping the revenue for Roche's 10 best-selling non-Genentech medicines. Genentech generated revenue per employee of $1.2 million in 2008, compared with $527,664 at its Swiss parent.

Wall Street analysts tie Roche's future to Genentech's continued success.

"Roche's long-term sales growth is better than its peers mainly due to a subsidiary that's been churning out its key blockbusters, while its own research unit hasn't been as productive," said Carri Duncan, an analyst at Macquarie Group in Zurich. "It appears to be a case of, 'If you can't beat 'em, join 'em.' "

That's certainly true in Roche's executive ranks. Genentech's Hal Barron, a 14-year veteran, is now head of Roche global development. Genentech CEO Ian Clark heads Roche's North American commercial operations. Pat Yang, who joined Genentech in 2004, moved to Basel to run global manufacturing. Scheller took a seat on Roche's 12-member executive committee.

Schwan said the shakeup of research led to initial uncertainty, particularly in Basel. Also, for the "first time ever in our history of acquisitions or mergers," global-management positions moved from Switzerland. Decision-making had in the past been concentrated at Roche headquarters.

Roche also preserved many Genentech jobs. Roche shut its Palo Alto facility and axed 500 of about 3,000 jobs at its Nutley, N.J., site as part of a manufacturing shakeup. More cuts may be in store, said Karl-Heinz Koch, an analyst at Helvea in Zurich.

Nutley is home to Roche's labs for research and early development of compounds to treat cancer, viruses and inflammation. Genentech labs are also working on those same therapies, he said.

Roche is changing the way its labs work after its scientists saw that Genentech's setup made more sense, Schwan said. Roche had maintained separate departments for laboratory research and early-stage drug testing in people. Now it has adopted Genentech's practices of combining them.

Schwan said Roche's concerns over losing Genentech employees led to the integration being handled differently than previous acquisitions.

"If we look back a year ago, it was of utmost importance to keep the spirit and the culture of Genentech and to keep innovation thriving," he said. "It was really, really important to retain people and to retain scientists."