Updated from 8:06 a.m. ESTShares of ImClone Systems ( IMCL) slipped Monday after the company said it had narrowed fourth-quarter and full-year losses, but the results fell below analysts' estimates The company also declined to give sales and earnings guidance for 2004's first quarter or for the full year, saying it needed more time to assess sales trends of its recently-approved colon cancer drug Erbitux. Without such guidance, Wall Street's estimates -- exacerbated by the fact that few analysts follow the company -- are all over the place. According to Thomson One Analytics, first-quarter estimates range from a profit of 28 cents a share to a loss of 39 cents. The average for the three analysts polled by the firm is a loss of 11 cents. For the full year, the average Thomson estimate is a profit of 11 cents, with the range careening from a loss of 82 cents to a gain of 90 cents. Analysts polled by the research firm had expected ImClone to lose 32 cents a share for 2003's fourth quarter and to lose $1.48 for the full year. Instead, the New York-based biotechnology company lost 35 cents for the quarter and $1.52 for the year. Still, those results were better than the previous year. For 2003's fourth quarter, ImClone lost $26.3 million, or 35 cents a share, compared with a loss of $39.4 million, or 54 cents a share, for the same period in 2002. Quarterly revenue rose to $19.8 million from $14.9 million. Last year, ImClone lost $112.5 million, or $1.52 a share, compared with 2002's loss of $157.9 million, or $2.15 a share. Total revenue grew to $80.8 million from $60 million. Last year's results exclude the impact of the Food and Drug Administration's approval of Erbitux four weeks ago, the drug's launch two weeks later and the receipt last week of a $250 million milestone payment from marketing partner Bristol-Myers Squibb ( BMY).