following your advice, I added quedalle classe :

...
LAYER
        NAME "nombre de cas"
        TYPE POINT
        PROJECTION
                "init=epsg:2154"
        END
        EXTENT 276838.0988 4584246.823 909596.998 8872270.142
        CONNECTIONTYPE POSTGIS
        CONNECTION blabla
        LABELITEM "nb_cas"
        CLASS
         EXPRESSION "quedalle"
         STYLE
                SYMBOL "circle"
                SIZE 150
                COLOR 0 0 0
         END
        END
        CLASS
                STYLE 
                        SYMBOL "cas"
                        SIZE [ln_nb_cas]
                        COLOR [couleur]
                        OPACITY 70                      
                END #fin style
                LABEL
                        COLOR 0 0 0
                        OUTLINECOLOR 255 255 255
                        FONT "verdana-gras"
                        TYPE truetype
                        SIZE 8
                END
        END #fin class

And indeed I am using an attribute for red circle size.
But the result is still the same.
(I can't believe I am the first to experience this issue!)
If it can help, here is a snap with the dummy class :
<http://osgeo-org.1560.x6.nabble.com/file/t372757/map.png> 



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