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 March, 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
---------------------

 PHASE III RAPTIVA(TM) STUDY RESULTS IN THE TREATMENT OF PSORIASIS PRESENTED AT
                               ANNUAL AAD MEETING


GENEVA,  SWITZERLAND  - MARCH 21, 2003 - SERONO S.A. (virt-x: SEO and NYSE: SRA)
Serono  today  announced  positive  results from a randomized Phase III clinical
trial  with  Raptiva(TM)  (efalizumab)  that  studied efficacy and safety in the
treatment of adults with moderate-to-severe plaque psoriasis.  The study results
were  presented  by  Kenneth  Gordon,  M.D.,  Associate  Professor  of Medicine,
Division  of  Dermatology  at  Loyola  University  in Chicago, Illinois during a
session on emerging biologic therapies for psoriasis at the 61st annual American
Academy  of  Dermatology  (AAD)  meeting  in  San  Francisco.

Results from the 556-patient, placebo-controlled study were consistent with data
obtained  from previous Phase III Raptiva studies and were included as part of a
Marketing  Authorization  Application  (MAA)  in  February  2003 to the European
Agency  for  the Evaluation of Medicinal Products (EMEA) and are currently under
review.

After  12  weeks  of  Raptiva  therapy,  27  percent  (98/369) of study patients
demonstrated  75  percent  or  greater  Psoriasis Area and Severity Index (PASI)
score  improvement,  versus  4  percent  (8/187)  of patients on placebo, and 59
percent  (216/369) achieved 50 percent or greater PASI score improvement, versus
14  percent  (26/187)  in  the  placebo  group.

"The  three  large Phase III trials and a long-term open label trial demonstrate
clinically  meaningful response in a majority of patients," said Andrew Galazka,
M.D.,  Serono's Senior Vice President Scientific Affairs. "We believe that these
efficacy  results  together  with Raptiva's rapid onset of action and its safety
profile  in  more  than  2,100  Raptiva-treated patients, means that Raptiva has
significant  potential  as  a  once-weekly  treatment  for  moderate-to-severe
psoriasis."

Data from 15 months of an open-label multicenter trial evaluating the safety and
tolerability  of  Raptiva  as  a potential continuous treatment in patients with
moderate-to-severe psoriasis will be presented by Alice Gottlieb, M.D., director
of the Clinical Research Center at the Robert Wood Johnson Medical School at the
University  of  Medicine  and  Dentistry  of  New  Jersey on Saturday, March 22.


                                     -more-



EFFICACY AND QUALITY OF LIFE DATA PRESENTED
In  the  double  blind, placebo-controlled, multicenter study, 556 patients were
randomized  in  a  2  to 1 ratio to receive weekly subcutaneous doses of 1 mg/kg
Raptiva  (n=369)  or  placebo (n=187) for a 12-week period.  The study's primary
endpoint  was  to  compare the percentage of patients who achieved 75 percent or
greater  improvement  in PASI scores (PASI 75) after 12 weeks of Raptiva therapy
with  patients receiving placebo.  Secondary endpoints include the percentage of
patients  who  achieved  50  percent or greater improvement in PASI scores (PASI
50);  the  Overall  Lesion  Severity  scale  (OLS), which is a static measure of
global  physician assessment on psoriasis; patient-reported outcomes such as the
Dermatology  Life  Quality  Index  (DLQI), which measures impairment from a skin
condition,  and  the  Psoriasis  Symptom  Assessment  (PSA).

At  week  12,  mean  improvement  in  DLQI  scores with Raptiva treatment was 47
percent,  versus  14  percent  for  patients  on placebo. The study results with
Raptiva  showed  improvement  on each of the eight PSA subsets: pain, burning or
stinging,  itching,  bothered  by  water,  irritation, sensitivity, bleeding and
scaling.

"The  reduction  in  disease  severity  and  rapid  onset  of action observed in
Raptiva-treated study patients along with the positive impact on these patients'
quality  of life measurements provide further support for Raptiva as a potential
treatment  option  for  psoriasis  patients,"  said  Dr.  Gordon.

The most common adverse events in patients receiving Raptiva compared with those
in the placebo group included headache, chills, pain, fever, and myalgia (muscle
pain).  These  events occurred principally following the first two injections of
Raptiva.  For  the  third  and  subsequent doses, the incidence of acute adverse
events  was  similar  between  the  Raptiva and placebo groups. The only serious
unexpected adverse event reported as study drug related by the investigators was
one  case  of  myelitis.


ABOUT  RAPTIVA(TM)
As  a  targeted  T-cell modulator, Raptiva (efalizumab) is designed to block the
activation  of  T-cells  that cause psoriasis, without destroying them.  Raptiva
has  been  studied  as  a  once-weekly  therapy  for the continuous treatment of
moderate-to-severe  plaque  psoriasis.  In  clinical  trials,  Raptiva  was
administered  via  subcutaneous  injection  and  in  several  of  the trials was
self-administered  by  some  patients  in  their  homes.

Raptiva(TM), a recombinant humanized monoclonal antibody, is designed to inhibit
the  adhesion  of T-lymphocytes to other cell types by inhibiting the binding of
LFA-1 to ICAM-1. This mechanism of action has a number of effects depending upon
the  cell  type, which include: (1) inhibition of T-lymphocyte interactions with
tissue-specific  cells, (2) inhibition of T-lymphocyte migration, (3) inhibition
of  T-lymphocyte activation, proliferation and cytokine release. In the clinical
Phase  III  studies,  Raptiva(TM)  was  given  as  a  once-a-week  subcutaneous
injection.  Raptiva(TM)  is  potentially  the  first  and  only  once-a-week
subcutaneous  treatment  for  psoriasis.  Raptiva(TM)  is  currently in Phase II
trials  in Rheumatoid Arthritis and is being also evaluated for the treatment of
Psoriatic  Arthritis.

                                     -more-



Serono has the rights to develop and market Raptiva(TM) worldwide outside of the
United  States  and Japan. Development and marketing rights in the United States
remain  with Genentech Inc. (NYSE:DNA) and its U.S. partner XOMA (Nasdaq: XOMA),
who  filed  a Biologics License Application (BLA) with the FDA in December 2002.

ABOUT  PSORIASIS

Psoriasis  is  a  chronic  skin  disease  that affects approximately 5.7 million
Europeans.  Psoriasis  occurs  when new skin cells grow abnormally, resulting in
thick,  red,  scaly, inflamed patches. Plaque psoriasis, the most common form of
the  disease,  is  characterized  by inflamed patches of skin ("lesions") topped
with  silvery  white scales.  Psoriasis can be limited to a few spots or involve
extensive areas of the body, appearing most commonly on the scalp, knees, elbows
and trunk. Although it is highly visible, psoriasis is not a contagious disease.
While  there  are  a number of medications that may help control the symptoms of
psoriasis,  there  currently  is  no  known  cure.

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).

                                       ###
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 May 21 2002.  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.
                                       ###


                                     -more-



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
------------------------


GENENTECH:
MEDIA  CONTACT:
Tara Cooper: +1 (650) 225-5505
INVESTOR  CONTACT:
Kathee Littrell: +1 (650) 225-1034
www.gene.com
------------


                                      -end-



                                                               [GRAPHIC OMITTED]
                                                                          Serono



Media  Release


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

 PRELIMINARY RESULTS FROM OPEN-LABEL RAPTIVA(TM) STUDY SUGGEST CONTINUED BENEFIT
                            WITH LONG-TERM TREATMENT

  OVER 64 PERCENT OF PATIENTS CONTINUING TREATMENT FOR 15 MONTHS SHOWED PASI 75
                OR GREATER RESPONSE WITH WEEKLY RAPTIVA THERAPY

GENEVA,  SWITZERLAND  - MARCH 24, 2003 - Serono S.A. (virt-x: SEO and NYSE: SRA)
Serono today announced preliminary results from an open-label, multicenter trial
evaluating  the  long-term  safety  and  tolerability  of continuous Raptiva(TM)
(efalizumab) treatment in patients with moderate-to-severe psoriasis.

"The  findings  from this important open label study on the long-term safety and
efficacy of Raptiva are very encouraging and further support Raptiva's potential
to  address  the  unmet  medical  need  of  patients  with  moderate-to-severe
psoriasis", said Andrew Galazka, M.D., Serono's Senior Vice President Scientific
Affairs.

Alice  Gottlieb,  M.D.,  director  of the Clinical Research Center at the Robert
Wood  Johnson  Medical School at the University of Medicine and Dentistry of New
Jersey  presented  data  for patients receiving continuous Raptiva treatment for
one-year following an initial three months of treatment. The data were presented
on Saturday, March 22 at the 61st annual American Academy of Dermatology meeting
being  held  in  San  Francisco.

RESPONSE RATES WITH CONTINUED RAPTIVA TREATMENT

A total of 339 patients were enrolled in this continuing open-label, multicenter
study.  41  percent  of  patients  (140/339)  achieved  75  percent  or  greater
improvement  in Psoriasis Area and Severity Index (PASI) scores (PASI 75) and 82
percent  (278/339)  achieved  PASI 50 or greater improvement after 12 weeks of 2
mg/kg/week Raptiva therapy. Patients who achieved PASI 50 or OLS (Overall Lesion
Severity  scale) of clear, minimal or mild at week 12 were eligible to enter the
continuous  treatment period. Of the original 339 patients, 290 patients who met
the  entry  criteria for the maintenance period entered the continuous treatment
phase  of  the  study.  For  each  successive  three-month  period of treatment,
dropouts  during  that  cohort  period  were  counted as non-responders for that
cohort, but were excluded from the subsequent cohorts.


                                     -more-



Starting from week 13, the weekly subcutaneous doses in patients were reduced to
1  mg/kg  Raptiva.  At  weeks 13-24 (n=290) more than 77 percent of patients who
continued on therapy achieved PASI 50 and more than 51 percent achieved PASI 75.
Of  which,  more  than  22  percent of patients achieved PASI 90. At weeks 49-60
(n=228), more than 79 percent of patients who continued on therapy achieved PASI
50  and  over  64  percent  achieved  PASI  75.  Of  which, more than 31 percent
achieved  PASI  90.

"The data from this study suggest that for some patients, Raptiva may present an
option  for  continuous  treatment  of  moderate-to-severe  psoriasis," said Dr.
Gottlieb.  "As  a  chronic disease, the opportunity for an efficacious treatment
with  a  favorable  safety  profile  is  of interest to clinicians as we explore
potential  therapies  for  this  devastating  disease."

The  most  common  adverse  events  during  the first 12 weeks of treatment were
headache,  non-specific  infection  (e.g.,  common colds), chills, pain, nausea,
asthenia  (weakness), and fever. These events principally occurred following the
first two injections of Raptiva. No new adverse events emerged during continuous
Raptiva  therapy.  Over time, among those patients who continued on therapy, the
percentage of patients who experienced at least one adverse event decreased from
57  percent  during weeks 13-24 to 47 percent during weeks 49-60. The occurrence
of  serious  adverse  events  during  the 15 months of treatment was infrequent,
which  is  consistent  with  data  from  previous  Raptiva  Phase  III  studies.

ABOUT  RAPTIVA(TM)
In  February  2003,  Serono filed a Marketing Authorization Application (MAA) to
the  European  Agency  for  the  Evaluation  of  Medicinal  Products  (EMEA) for
Raptiva(TM)  (efalizumab)  for  the  treatment  of  adult  patients  with
moderate-to-severe  plaque psoriasis. The MAA submission included data from over
2,100  patients  with  moderate-to-severe plaque psoriasis treated with Raptiva.

Serono has the rights to develop and market Raptiva(TM) worldwide outside of the
United  States  and Japan. Development and marketing rights in the United States
remain  with Genentech Inc. (NYSE:DNA) and its U.S. partner XOMA (Nasdaq: XOMA),
who  filed  a Biologics License Application (BLA) with the FDA in December 2002.

As  a  targeted T-cell modulator, Raptiva is designed to block the activation of
T-cells that cause psoriasis, without destroying them.  Raptiva has been studied
as  a  once-weekly  therapy  for  the continuous treatment of moderate-to-severe
plaque psoriasis.  In clinical trials, Raptiva was administered via subcutaneous
injection and in several of the trials was self-administered by some patients in
their  homes.

Raptiva(TM), a recombinant humanized monoclonal antibody, is designed to inhibit
the  adhesion  of T-lymphocytes to other cell types by inhibiting the binding of
LFA-1 to ICAM-1. This mechanism of action has a number of effects depending upon
the  cell  type, which include: (1) inhibition of T-lymphocyte interactions with
tissue-specific  cells, (2) inhibition of T-lymphocyte migration, (3) inhibition
of  T-lymphocyte activation, proliferation and cytokine release. In the clinical
Phase  III  studies,  Raptiva(TM)  was  given  as  a  once-a-week  subcutaneous
injection.  Raptiva(TM)  is  potentially  the  first  and  only  once-a-week
subcutaneous  treatment  for  psoriasis.  Raptiva(TM)  is  currently in Phase II
trials  in Rheumatoid Arthritis and is being also evaluated for the treatment of
Psoriatic  Arthritis.


                                     -more-



ABOUT  PSORIASIS

Psoriasis  is  a  chronic  skin  disease  that affects approximately 5.7 million
Europeans.  Psoriasis  occurs  when new skin cells grow abnormally, resulting in
thick,  red,  scaly, inflamed patches. Plaque psoriasis, the most common form of
the  disease,  is  characterized  by inflamed patches of skin ("lesions") topped
with  silvery  white scales.  Psoriasis can be limited to a few spots or involve
extensive areas of the body, appearing most commonly on the scalp, knees, elbows
and trunk. Although it is highly visible, psoriasis is not a contagious disease.
While  there  are  a number of medications that may help control the symptoms of
psoriasis,  there  currently  is  no  known  cure.

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).


                                       ###
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 May 21 2002. 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.
                                       ###


                                     -more-



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
------------------------


GENENTECH:
MEDIA  CONTACT:
Tara Cooper: +1 (650) 225-5505
INVESTOR  CONTACT:
Kathee Littrell: +1 (650) 225-1034
www.gene.com
------------


                                      -end-



                                   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)



March  24,  2003                    By: /s/  Allan  Shaw
                                        -------------------
                                        Name:  Allan  Shaw
                                        Title: Chief  Financial  Officer