SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    ________

                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                      PURSUANT TO RULE 13a-16 OR 15d-16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                           For the month of June, 2004

                                  Serono S.A.
                      ------------------------------------
                              (Registrant's Name)

                            15 bis, Chemin des Mines
                                Case Postale 54
                                CH-1211 Geneva 20
                                  Switzerland
                      ------------------------------------
                    (Address of Principal Executive Offices)

                                    1-15096
                  --------------------------------------------
                              (Commission File No.)

     (Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F.)

     Form 20-F  X  Form 40-F
               ---           ---

     (Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(1).)  ______

     (Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(7).)   ______

     (Indicate by check mark whether the registrant by furnishing the
information contained in this form is also thereby furnishing the information to
the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)

     Yes     No  X
         ---    ---

     (If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82-______)



                                                                          SERONO


Media Release


FOR IMMEDIATE RELEASE
---------------------


               SERONO INITIATES PHASE III TRIAL OF SEROSTIM(R) IN
                 HIV-ASSOCIATED ADIPOSE REDISTRIBUTION SYNDROME

     STUDY AIMED AT ASSESSING BENEFITS OF RECOMBINANT HUMAN GROWTH HORMONE AS
   POTENTIAL TREATMENT AND MAINTENANCE THERAPY FOR HIV METABOLIC COMPLICATION

GENEVA,  SWITZERLAND  AND  ROCKLAND,  MA,  JUNE  1,  2004-  Serono, Inc., the US
affiliate  of  Serono  (virt-x:  SEO  and  NYSE:  SRA), announced today that the
company  has  initiated  a  Phase  III clinical trial of Serostim(R) [somatropin
(rDNA origin) for injection] as a potential treatment and maintenance therapy to
reduce  excess visceral fat accumulation in patients with HIV-associated adipose
redistribution  syndrome  (HARS).  HARS  is  a  potentially debilitating medical
condition  experienced  by  people  being  treated  for  HIV  for which there is
currently  no  medical treatment. The visceral adipose tissue accumulations seen
in HARS may also be associated with an adverse risk profile.

This  multi-center,  randomized,  double-blind,  placebo-controlled study of the
safety  and  efficacy  of  Serostim(R)  in  HARS  will include approximately 300
patients  at  30 clinical trial sites. The study will evaluate the effectiveness
of  Serostim(R)  4mg  administered  daily  for  12  weeks compared to placebo in
reducing  abdominal  visceral  adipose  tissue  while  assessing,  among  other
endpoints,  patient  reported outcomes. This trial will also evaluate the effect
of  Serostim(R)  2mg  administered on alternate days as a maintenance therapy to
sustain reductions in visceral adipose tissue attained during the first 12 weeks
of  active  therapy.

"This  trial  will  build  upon Serono's extensive experience with Serostim(R),"
said  Paul Lammers, MD, MSc, Chief Medical Officer, Serono, Inc. "We are hopeful
that  it  will demonstrate the effectiveness of recombinant human growth hormone
for  this  metabolic  complication  of  HIV."

The  results  of  previous  studies suggest that Serostim(R) may be an effective
treatment for this indication.  Serono has previously reported positive findings
of  the Serostim(R) for the Treatment of Adipose Redistribution Syndrome (STARS)
study,  a  double-blind,  placebo-controlled  study,  designed  to  evaluate
Serostim(R)  as  a  potential  HARS  therapy.  The  study  results  showed  that
Serostim(R)  4mg  administered  daily  for  12  weeks decreased visceral adipose
tissue  and trunk fat as compared to placebo (p<0.001). A significant decline in
total  and  non-HDL  cholesterol  as  compared  to  placebo  was  also  observed
(p<0.005).


                                                                             1/3

HIV-associated  adipose  redistribution  syndrome  or  HARS  is  a subset of HIV
lipodystrophy.  HIV-associated  lipodystrophy  is  characterized by a variety of
metabolic  disturbances  and  body  shape  abnormalities  that  may  present
individually  or  in  combination.

Patients  with  HARS  experience  abnormal, pathological accumulation of adipose
tissue,  which  may  be  present  with or without fat depletion and/or metabolic
abnormalities.  In  general,  HARS  patients  accumulate excess visceral adipose
tissue  in  the  abdomen and may develop a fat pad of on the upper back commonly
known  as  a  "buffalo  hump."


ABOUT  SEROSTIM(R)
Serostim(R)  [somatropin  (rDNAorigin) for injection] is the only growth hormone
approved  by  the  US  Food  and  Drug  Administration  for  the  treatment  of
HIV-associated  wasting  or cachexia. The recommended dose is 0.1 mg/kg daily (6
mg/day  for  patients  > 55 kg). Serostim(R) 0.1 mg/kg every other day should be
considered  as  a  starting  dose  in  patients thought to be at risk of certain
adverse  effects,  i.e.,  glucose  intolerance.

In  patients  with  HIV-associated  wasting,  the  most  common  adverse  events
associated  with  Serostim(R) therapy are mild to moderate muscle and joint pain
and  swelling,  which  occur  in  a  dose-related  manner and often subside with
continued  treatment  or dose reduction.  Cases of impaired glucose intolerance,
Type 2 diabetes mellitus and exacerbation of pre-existing diabetes mellitus have
been reported in patients receiving Serostim(R).  Some patients develop diabetic
ketacidosis  and  diabetic  coma.  In  some  patients,  therapy with Serostim(R)
necessitated initiation or adjustment of anti-diabetic treatment.  Patients with
a  history of hyperglycemia or other risk factors for glucose intolerance should
be  monitored closely during treatment with Serostim(R).  Transient increases in
glucose levels occur early in treatment and should be monitored.

Use  of  growth hormone is contraindicated in treatment of patients in intensive
care  units  due  to  complications  following  open-heart  surgery or abdominal
surgery,  multiple accidental trauma or acute respiratory failure; patients with
active  neoplasia;  and  patients with known hypersensitivity to growth hormone.
Serostim(R) must be used in conjunction with antiretroviral therapy.

Full  prescribing  information  for  Serostim(R),  including  important  safety
information,  is  available  at  www.serostim.com.
                                 ----------------


                                                                             2/3

ABOUT  SERONO
Serono,  Inc.,  located in Rockland, MA, is the US affiliate of Serono, a global
biotechnology leader headquartered in Geneva, Switzerland. The Company has seven
recombinant products Rebif(R) (interferon beta-1a), Gonal-F(R) (follitropin alfa
for  injection),  Luveris(R)  (lutropin  alfa),  Ovidrel(R)/Ovitrelle(R)
(choriogonadotropin  alfa  injection), Serostim(R) [somatropin (rDNA origin) for
injection],  Saizen(R) [somatropin (rDNA origin) for injection] and Zorbtive(TM)
[somatropin  (rDNA  origin)  for  injection]. (Luveris(R) is not approved in the
USA.)(1)  In  addition  to being the world leader in reproductive health, Serono
has  strong  market positions in neurology, metabolism and growth. The Company's
research  programs  are  focused on growing these businesses and on establishing
new  therapeutic  areas.  Currently,  there are over 30 projects in development.

In  2003,  Serono  achieved worldwide revenues of US$ 2,018.6 million, and a net
income  of  US$390  million,  making it the third largest biotech company in the
world. Its products are sold in over 90 countries. Bearer shares of Serono S.A.,
the  holding company, are traded on the virt-x (SEO) and its American Depositary
Shares are traded on the New York Stock Exchange (SRA).

                                       ###

Some  of  the  statements  in  this  press  release  are  forward  looking. Such
statements  are inherently subject to known and unknown risks, uncertainties and
other  factors  that  may  cause  actual results, performance or achievements of
Serono  S.A.  and  affiliates  to be materially different from those expected or
anticipated  in  the  forward-looking statements. Forward-looking statements are
based on Serono's current expectations and assumptions, which may be affected by
a  number  of  factors, including those discussed in this press release and more
fully  described  in  Serono's  Annual  Report  on Form 20-F filed with the U.S.
Securities and Exchange Commission on March 25, 2004.  These factors include any
failure  or  delay  in  Serono's ability to develop new products, any failure to
receive  anticipated  regulatory  approvals,  any  problems  in  commercializing
current  products  as  a  result of competition or other factors, our ability to
obtain  reimbursement  coverage  for  our  products,  and government regulations
limiting  our  ability  to  sell  our  products. Serono has no responsibility to
update the forward-looking statements contained in this press release to reflect
events or circumstances occurring after the date of this press release.

                                       ###

FOR MORE INFORMATION, PLEASE CONTACT:
  SERONO IN GENEVA, SWITZERLAND:
  MEDIA RELATIONS:                INVESTOR RELATIONS:
  Tel:  +41-22-739 36 00          Tel:  +41-22-739 36 01
  Fax:  +41-22-739 30 85          Fax:  +41-22-739 30 22
  http://www.serono.com           Reuters: SEO.VX / SRA.N
  ---------------------           Bloomberg: SEO VX / SRA US

  SERONO, INC., ROCKLAND, MA
  MEDIA RELATIONS:                INVESTOR RELATIONS:
  Tel.  +1 781 681 2486           Tel.  +1 781 681 2552
  Fax:  +1 781 681 2935           Fax:  +1 781 681 2912




_______________
(1)  Package  inserts  for  Serono's  US  marketed  products  are  available  at
www.seronousa.com or by calling 1-888-275-7376.
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                                   SIGNATURES

     Pursuant  to  the  requirements of the Securities Exchange Act of 1934, the
registrant  has  duly  caused  this  report  to  be  signed on its behalf by the
undersigned,  thereunto  duly  authorized.



                                        SERONO S.A.
                                        a Swiss corporation
                                        (Registrant)



June 1, 2004                       By:  /s/  Francois Naef
                                        -----------------------
                                        Name:  Francois Naef
                                        Title: Secretary