Methods for labeling eukaryotic cells from a multicellular organism as well as for treating and/or diagnosing a cancer using modified monosaccharide compounds

An in vitro method for labeling or detecting or targeting an eukaryotic cell from a multicellular organism, the method comprising the steps of:

• a) contacting a sample comprising eukaryotic cells with at least one modified monosaccharide compound or a precursor thereof;
• b) contacting the sample of step (a) with a compound bearing a first reactive group, optionally in presence of copper;
• and
• c) optionally detecting the compound of step (b) bond to the monosaccharide of step (a), as to detect eukaryotic cells;
• wherein said at least one modified monosaccharide compound has the following formula (I):
• in which X is a second reactive group, the first and the second reactive groups being able to react together in a click chemistry reaction.