Maxicare Health Plans Inc. and HealthCare Corp....

Maxicare Health Plans Inc. and HealthCare Corp. of America announced that they have terminated negotiations for the sale of Maxicare Maryland L.P. to HealthCare Corp . . . James Lennane, chairman of Systems Integrators Inc., said he may withdraw his $7.25-a-share offer if the Sacramento-based company accepts a higher bid, according to an SEC filing . . . El Segundo-based Computer Sciences Corp. said a joint venture it heads has won an $84-million Navy contract, not including award fee, for the operation and maintenance of the Pacific missile range facility at Barking Sands, Hawaii . . . Hilton Hotels Corp. of Beverly Hills said it expects to report a second-quarter profit of about 85 cents a share, up 16% from last year’s 70 cents . . . Midland, Mich.-based Dow Chemical Co. increased its quarterly common stock dividend to 70 cents a share from 60 cents, payable Oct. 28 to shareholders of record Sept. 30 . . . The national office vacancy rates for metropolitan areas dropped 0.6% to a rate of 19.8% in the second quarter, extending a two-year decline to the lowest level in three years, Coldwell Banker said . . . Rupert Murdoch added a leading religious publisher to his media empire when his Harper & Row Publishers agreed to buy Zondervan Corp. for about $56.7 million.