PARIS--(BUSINESS WIRE)--Cytheris SA, a clinical stage biopharmaceutical company focused on research and development of new therapies for immune modulation, today announced that it has begun enrolling patients in its Phase I/IIa clinical program evaluating the company’s investigative immune-modulator, recombinant human Interleukin-7 (CYT107), in combination with standard antiviral treatment and vaccination in HBeAg-negative chronic hepatitis B-infected (HBV) patients.