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 April, 2003

                                  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-______)



                                                               [GRAPHIC OMITTED
                                                                   SERONO]

Media Release

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


    SERONO DISAGREES WITH CPMP OPINION FOR SEROSTIM IN AIDS WASTING IN EUROPEAN
                                      UNION


GENEVA, SWITZERLAND, APRIL 30, 2003 - Serono S.A. (virt-x: SEO and NYSE: SRA)

Serono  disagrees  with  the  opinion  issued  by  the Committee for Proprietary
Medicinal Products (CPMP) on April 25, 2003 that recommends not granting initial
marketing authorization for Serostim(R) for the treatment of AIDS wasting in the
European Union. In contrast with the CPMP opinion, Serono believes that the data
submitted  confirm  the safety and efficacy of Serostim(R) in the rare condition
of  AIDS  wasting  and  that  the  data  do  justify  the  therapeutic  benefits
for  patients  who  have  no  alternative  treatment.

AIDS  wasting was designated as a rare condition based on the published criteria
of  the  US  Centers for Disease Control and Prevention (CDC)(1). In August 2000
the  European  Commission  granted  Serostim(R)  orphan designation based on the
opinion  of  the  Committee for Orphan Medicinal Products (COMP). This Committee
confirmed  that  the  indication  of  AIDS  wasting  in the EU should also be in
agreement  with  the  CDC  disease  definition.

The Serostim(R) AIDS Wasting Confirmatory Study (GF9037) was designed to include
patients meeting the agreed and official definition of AIDS wasting. The results
of  this  confirmatory  trial were positive and demonstrate a highly significant
increase  of  both  work  output and lean body mass as well as an improvement in
quality  of  life  for  the  patients  treated  with  Serostim(R) as compared to
patients  treated  with placebo. The results of this study were presented at the
International  AIDS  Conference  in  Barcelona  in  July  2002.

It is unfortunate that the current CPMP view of AIDS wasting is not aligned with
the  definition  of  the  orphan  drug  designation  granted in Europe. The CPMP
opinion  reflects the difficulties in the understanding of rare and continuously
evolving  diseases  and  in  the  assessment of appropriate treatments. The full
implementation of the EU Orphan Regulation needs to be improved to ensure access
to  innovative  treatments  for rare diseases in Europe. Serono will continue to
work  with  the  European  Commission,  the  EMEA  and all interested parties to
improve  the  policy  continuity  from  the orphan designation, through clinical
development  and marketing authorization, to meet patients' unmet medical needs.

_______________________________
(1)  An  involuntary  weight  loss  of  greater  than  10%  with intermittent or
     constant fever and chronic diarrhea, or chronic weakness and fever for more
     than  30  days in the absence of other causes than HIV that may explain the
     condition



The  CPMP  negative  opinion  marks a sad day for the European patient community
suffering from rare diseases, and for all other interested parties. Serono wants
to  reassure  European AIDS wasting patients currently under Serostim(R) therapy
both in clinical programs and in national compassionate use schemes, that Serono
will continue to work with authorities and patient associations to ensure access
to  the  product  in  compliance  with  local  regulations.

Serono  will  review  the  full  details  of  the  current  CPMP opinion, and is
considering  the  appropriate  next  steps.


                                   BACKGROUND
                                   ----------

SEROSTIM (R) AIDS WASTING CONFIRMATORY TRIAL

The  Serostim(R) AIDS wasting confirmatory trial included more than 700 patients
at  US,  EU  and  other  international  trial  sites.  Following the accelerated
approval  of  Serostim(R) by the FDA, Serono conducted this study to confirm the
safety  and  efficacy  of  Serostim(R).  Patients  were  randomized  into  three
treatment  groups  to  receive  Serostim  (R)  6  mg  daily, Serostim(R) 6 mg on
alternate  days  or  placebo  for  a  12-week  treatment  period.

The  primary  endpoint  of  the  study  was  to confirm the clinical efficacy of
Serostim(R) compared with placebo, based on exercise function change as assessed
by  cycle  ergometer  work  output  from baseline to week 12. The results of the
primary endpoint were positive and demonstrated a highly significant increase of
work  output  of  9.9%  in  the  group treated with Serostim(R) 6 mg daily and a
decrease  of  1%  in  the  placebo  group  (p<0.0001).

The  secondary  endpoint  was  the  change  in  lean  body  mass  as measured by
bioimpedance spectroscopy (BIS) from baseline to week 12. Findings demonstrate a
dose-response  relationship.  The  quantity  of  lean tissue gained in the group
treated with Serostim(R) 6mg daily (median gain in lean body mass 5.2 kg) and in
the  group  treated with Serostim(R) 6 mg on alternate days (median gain in lean
body  mass  3.3  kg)  was  significantly  greater  compared to the placebo group
(median  gain  in  lean body mass 0.6 kg) (p<0.0001 for both Serostim(R) doses).
Furthermore,  patients  receiving  Serostim(R)  6  mg  daily had a significantly
greater  effect  in  terms  of median gain in lean body mass than those patients
receiving  Serostim(R)  6  mg  on  alternate  days  (p=0.017). Adverse reactions
reported  during  this clinical trial were consistent with those expected within
the  current  approved  indication  for  Serostim(R).

The  study  used  two  Quality  of  Life  scales to assess patients' response to
treatment  with Serostim(R) for AIDS wasting. Results were favorable. When asked
the  question  'Do  you  think  this  treatment  has  been  of  benefit to you?'
Serostim(R)  treated  patients responded significantly more favorably than those
treated  with  placebo (p<0.0001). In addition, patients receiving Serostim(R) 6
mg  daily  responded  significantly  more  favorably  than  those  treated  with
Serostim(R)  6  mg  every  other  day  (p=0.004)

ABOUT AIDS WASTING AND SEROSTIM

AIDS  wasting  is  a  chronically  debilitating and potentially life-threatening
condition.  In spite of the introduction of highly active antiretroviral therapy
(HAART),  which  extends  the  lives  of people with HIV, AIDS wasting remains a
concern  and  an independent predictor of mortality (JAIDS 2002; 31:230-236). It
is  a  metabolic  disorder  that  causes  the body to use vital muscle and organ
tissue,  which  is  critical for survival, for energy instead of primarily using
the body's stored fat. People with AIDS wasting usually experience a loss of 10%
or  more of body weight, mainly due to loss of lean body mass, which consists of
muscle  tissue,  important  body  organ and blood cells, including red cells and
functioning  white  cells.  The  result  can  lead  to  increased  risk  for
opportunistic  infections  and  illness,  extreme  fatigue  and  can  profoundly
diminish  a  person's  quality  of  life.



Serostim(R)  is  the  only  growth  hormone  approved  by  the  US Food and Drug
Administration  (FDA) for the treatment of AIDS wasting or cachexia. Serostim(R)
received  FDA accelerated approval in 1996 based upon the analysis of changes in
body  weight and lean body mass in surrogate endpoints in clinical studies up to
12  weeks  in  duration.  Serostim(R)  is  now  on  the  market in 13 countries.

Serostim,(R)  when  taken as prescribed in 6mg doses over 12 weeks, is generally
well  tolerated.  The most common adverse reactions to Serostim(R) are increased
tissue  turgor  (generally  swelling  of  hands  and  feet)  and musculoskeletal
discomfort  (pain,  swelling  or  stiffness).  Generally  mild  to  moderate  in
severity,  these symptoms usually resolve spontaneously with continued treatment
or  are  effectively managed with analgesic therapy or after reducing the weekly
dose.  Serostim(R)  must  be  used  in  conjunction with antiretroviral therapy.
Elevations in mean blood glucose levels can also occur. Patients with other risk
factors  for  glucose  intolerance should be monitored closely. Full prescribing
information  for  Serostim(R)  is  available  at  www.aidswasting.com
                                                  -------------------
                                       ###
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 April 17, 2003.  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.
                                       ###

ABOUT SERONO

Serono  is  a  global  biotechnology  leader.  The  Company  has six recombinant
products  on  the  market,  Gonal-F(R),  Luveris(R),  Ovidrel(R)/Ovitrelle(R),
Rebif(R),  Serostim(R) and Saizen(R) (Luveris(R) is not approved in the USA). 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.

Serono  was  awarded the International James D. Watson Helix 2003 Award from the
Biotechnology  Industry  Organization  (BIO)  in  recognition  of  the Company's
outstanding  leadership  and  highest  standards  of  scientific  and  product
achievement.

In  2002,  Serono  achieved  worldwide  revenues  of US$1.546 billion, and a net
income  of  US$321  million,  making it the third largest biotech company in the
world.  The  Company operates in 45 countries, and its products are sold in over
100  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).

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:   SEOZ.VX  /  SRA.N
  ---------------------
                                 Bloomberg: SEO VX / SRA US
SERONO, INC., ROCKLAND, MA
MEDIA RELATIONS:                 INVESTOR RELATIONS:
Tel. +1 781 681 2340             Tel.   +1 781 681 2552
Fax: +1 781 681 2935             Fax:   +1 781 681 2912
http://www.seronousa.com
------------------------



                                   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)



April 30, 2003                     By: /s/ Allan Shaw
                                       -------------------
                                       Name:  Allan Shaw
                                       Title: Chief Financial Officer