Sen. Alan Cranston, D-Calif., said Thursday he has cancer of the prostate and won't seek re-election in 1992.

"The physicians tell me that the cancer is apparently totally curable, but immediate treatment is necessary," Cranston said in a statement.Cranston, 76, also said he would not seek another two-year term as deputy majority leader for the Congress that convenes in January.

He was first elected to the Senate in 1968 and has been elected to the No. 2 Democratic position every year since 1977.