* Celera Genomics of Rockville announced a strategic alliance with Abbott Laboratories of Abbott Park, Ill., to develop cancer treatment therapies. The companies said Celera will identify cell surface proteins that appear more frequently on cancer cells than on non-cancerous cells. Abbott, a major pharmaceutical producer, will identify antibodies and small-molecule drugs to zero in on those proteins. The companies would jointly fund clinical studies and share profits from any successful drugs that result. Financial details were not revealed.

* XO Communications of Reston said the Securities and Exchange Commission has requested information as part of an informal investigation into the telecommunications industry. The SEC is investigating how companies measure and disclose the number of customers and access lines they have.

* SI International of Reston said its stock had been added to the Russell 2000 index. The annual reconstitution of Russell's 21 U.S. equity indexes captures the 3,000 largest U.S. stocks to create the Russell 3000 index. The largest 1,000 companies compose the large-cap Russell 1000 index, while the remaining 2,000 companies make up the small-cap Russell 2000. Shares of SI International closed at $20.63, down 24 cents.

* Osiris Therapeutics, a Baltimore biotechnology company, named C. Randal Mills president and chief executive. Mills was a founding member of Regeneration Technologies and served as vice president of business development as well as vice president of operations.

* Tachyon Networks, a Vienna satellite communications company, named Yaniv Oz to the new position of vice president of distribution channels. Oz was most recently director of channel partner programs at Spacenet, a subsidiary of Gilat Satellite Networks.

Compiled from reports by Washington Post staff writers.