[Lewis-negative blood group. Definite frequency, probable prognostic value in adult psychiatry]. / Groupe sanguin Lewis négatif. Fréquence certaine, valeur pronostique probable en psychiatrie de l'adulte.

The negative Lewis blood type is meaningfully more frequent with our psychiatric patients than with the general population. The theoretical interest of this fact is certain for the reason of two particularities of this blood type. It is not genetically and definitely determined at birth: the absence of passing over negativity through positivity seems to constitute a factor in favour of the blossoming of a psychiatric pathology. It is in connection with the secretory aptitude of some cells: this fact opens some perspectives for the comprehension of the deficits in the neurotransmitters. The application of theory will be confirmed by others statistics. But it indeed appears that the control of the chemiotherapy is more difficult with the negative Lewis blood type patients.