* EntreMed, a Rockville biotechnology company, filed a lawsuit against Celgene, accusing the New Jersey company, which sued EntreMed on Tuesday for alleged patent infringement, of the same transgression. Both companies are trying to establish legal control over an identical cancer treatment that EntreMed markets under the name ENMD 0995 and Celgene under the name Actimid. In its lawsuit EntreMed seeks to invalidate three Celgene patents tied to the drug candidate, an experimental version of thalidomide used to treat patients with multiple myeloma, a rare bone-marrow cancer. EntreMed also asked the court to dismiss Celgene's lawsuit, which attempts to block EntreMed patent applications relating to the treatment. Cash-strapped EntreMed said it would not pay legal bills tied to either suit until it secures public or private financing.

* Sonic Telecom, a privately held Chantilly company that transmits broadcast video services through its network of satellites and fiber-optic cable, said it signed a three-year contract with ABC Television for an undisclosed amount. Sonic, which was founded in 1996, has other network customers including NBC, Fox News and Lifetime. Its video-transmission technology allows ABC and ABC NewsOne affiliates to download the network's various programs from a server on demand, rather than its current system, which requires each local affiliate to download all of the network's programming at a set time and then chose the segments it will use. Sonic's technology saves networks, on average, 30 percent over the current system, according to a spokesman.

* CACI International, an Arlington government contractor, named three new members to its board of directors. Retired general Larry D. Welch is the president and chief executive of the Institute for Defense Analyses and previously served as the Air Force chief of staff. Arthur L. Money was the assistant secretary of defense for command, control, communications and intelligence. Michael J. Bayer is vice chairman of the Defense Department's business board.

* Sensytech, a Newington company that provides communication equipment, began trading on the Nasdaq Stock Market. Shares of Sensytech, trading under the symbol STST, closed at $8.27.

Compiled from reports by Washington Post staff writers, washingtonpost.com and Dow Jones News Service