8-K

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

      Date of Report (Date of earliest event reported): September 30, 2004

                           ARIAD Pharmaceuticals, Inc.
             (Exact name of registrant as specified in its charter)


        Delaware                    0-21696           22-3106987
 (State or other jurisdiction     (Commission        (I.R.S. Employer
     of incorporation)            File Number)      Identification No.)


              26 Landsdowne Street, Cambridge, Massachusetts     02139
               (Address of principal executive offices)       (Zip Code)


       Registrant's telephone number, including area code: (617) 494-0400


                                 Not Applicable
          (Former name or former address, if changed since last report)


Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

|_|  Written communications pursuant to Rule 425 under the Securities Act
     (17 CFR 230.425)

|_|  Soliciting material pursuant to Rule 14a-12 under the Exchange Act
     (17 CFR 240.14a-12)

|_|  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))

|_|  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))





ITEM 8.01  Other Events.

      In a press release dated September 30, 2004, ARIAD Pharmaceuticals, Inc.
      announced, for the first time, updated results of two Phase 1 clinical
      trials of its novel mTOR inhibitor, AP23573 as a single agent, showing
      documented tumor regression in patients with advanced cancers - most
      of whom had progressive disease upon entering the trial and virtually
      all of whom had failed alternative treatments. These clinical results
      are being presented today at the 2004 EORTC-NCI-AACR Symposium on
      Molecular Targets and Cancer Therapeutics in Geneva, Switzerland. A
      copy of the press release is filed herewith as Exhibit 99.1 and the
      information contained therein is incorporated by reference into this
      Item 8.01 of this Current Report on Form 8-K.


ITEM 9.01  Financial Statements and Exhibits.

      (c)  The following exhibits are filed with this report

           Exhibit
           Number            Description
           ------            -----------
           99.1              Press release dated September 30, 2004.


                                       2


                                   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 hereunto duly authorized.

                                ARIAD Pharmaceuticals, Inc.

                                By: /s/ Edward M. Fitzgerald
                                    --------------------------------------
                                    Edward M. Fitzgerald
                                    Senior Vice President and Chief Financial
                                    Officer

Date:    September 30, 2004

                                       3


                                  EXHIBIT INDEX
                                  -------------

Exhibit
Number            Description
- ------            -----------
 99.1             Press release dated September 30, 2004.





                                       4

EX-99.1

                                                                    EXHIBIT 99.1
                                                                    ------------

ARIAD Reports Tumor Regression With AP23573 As a Single Agent in Patients with
Relapsed and/or Refractory Cancer

    CAMBRIDGE, Mass.--(BUSINESS WIRE)--Sept. 30, 2004--

    Updated Phase 1 Clinical Results on Novel mTOR Inhibitor Presented
at International Cancer Symposium

    ARIAD Pharmaceuticals, Inc. (Nasdaq: ARIA) today announced, for
the first time, updated results of two Phase 1 clinical trials of its
novel mTOR inhibitor, AP23573 as a single agent, showing documented
tumor regression in patients with advanced cancers - most of whom had
progressive disease upon entering the trial and virtually all of whom
had failed alternative treatments. These clinical results are being
presented today at the 2004 EORTC-NCI-AACR Symposium on Molecular
Targets and Cancer Therapeutics in Geneva, Switzerland.

    Combined Trial Results: Anti-tumor Responses

    Of 49 evaluable patients in the two trials, tumor regression was
demonstrated in 9 patients (4 "partial responses" by RECIST with at
least 30% reduction in tumor size and 5 "minor responses" with 15% to
29% reduction). In an additional 15 patients, disease stabilization
was achieved. Overall, 49% (24 of 49) of the patients in the two
trials had documented anti-tumor responses (including partial and
minor responses and stable disease), with a median response of 5
months in those demonstrating anti-tumor responses, extending to
greater than 18 months - the longest treatment to date.
    Anti-tumor responses were demonstrated in 9 different refractory
and/or relapsed cancers, including all evaluable patients with sarcoma
(5 of 5), kidney cancer (7 of 7) and lymphoma (1 of 1), as well as 2
of 3 patients with non-small cell lung (NSCL) cancer.
    "We are extremely encouraged by the number of patients with
relapsed and/or refractory cancer who demonstrated tumor regression
with AP23573 in Phase 1 clinical trials, as well as the breadth of
tumors that are responding to our novel mTOR inhibitor," said Harvey
J. Berger, M.D., chairman and chief executive officer of ARIAD. "As a
clinician, I was particularly struck by the results in one patient
with a Ewing's sarcoma who had received nine prior anticancer
regimens. After four cycles of AP23573, CT scans showed a 62%
reduction in the size of the mass; this patient continues on study.
Phase 2 studies of AP23573 are ongoing in patients with hematologic
cancers and solid tumors."

    Daily Dosing Trial Results

    In the 27 evaluable patients in the daily dosing trial - the
dosing regimen being used in current Phase 2 clinical trials - AP23573
produced tumor regression in 7 patients:

    --  Partial response - Sarcoma, lymphoma, and NSCL cancer (1 each)

    --  Minor response - Sarcoma, NSCL, kidney, and thyroid cancers (1
        each).

    An additional 9 patients in this trial had stabilization of their
disease (overall 59% with anti-tumor response).

    Weekly Dosing Trial Results

    In the 22 evaluable patients in the weekly dosing trial, AP23573
also produced tumor regression in 2 patients, both with particularly
difficult-to-treat cancers, even when the drug was administered only
once each week:

    --  Partial response - Bladder cancer (1) (unconfirmed, repeat
        scans pending)

    --  Minor response - Mesothelioma, a form of chest-cavity cancer
        (1).

    An additional 6 patients in this trial had stabilization of their
disease (overall 36% with anti-tumor response).

    Additional Combined Trial Results

    The daily dosing trial is ongoing at the Institute for Drug
Development, Cancer Therapy and Research Center, San Antonio (M. Mita,
M.D. and A. Tolcher, M.D.), and the weekly dosing trial is ongoing at
the University of Chicago Cancer Center (A. Desai, M.D. and M. Ratain,
M.D.).
    AP23573 has been well tolerated by patients in both trials, with
generally mild or moderate, readily reversible adverse events. The
dose-limiting toxicity was severe oral mucositis, an inflammatory
irritation of the mucous membranes of the mouth and a common finding
in cancer patients on various types of treatments.
    Pharmacodynamic assays on patient samples demonstrated a good
correlation of blood levels of AP23573 with inhibition of AP23573's
molecular target, the protein mTOR. Greater than 90% inhibition was
observed within 1 hour after dosing in all patients in both trials.
With daily dosing of AP23573, there was sustained inhibition of mTOR
activity for up to 10 days in the majority of patients studied.
    The pharmacokinetic (blood-clearance) profile of AP23573 was found
to be highly predictable and reproducible, with a median half-life of
49 hours for all patients with complete data in the two trials. In
contrast to other mTOR inhibitors in clinical trials, AP23573 was
stable in vivo and is not a pro-drug.

    About AP23573

    The small-molecule drug, AP23573, starves cancer cells and shrinks
tumors by inhibiting the critical cell-signaling protein, mTOR, which
regulates the response of tumor cells to nutrients and growth factors,
and controls tumor blood supply and angiogenesis through effects on
Vascular Endothelial Growth Factor (VEGF).

    About the Company

    ARIAD is engaged in the discovery and development of breakthrough
medicines to treat cancer by regulating cell signaling with small
molecules. The Company is developing a comprehensive approach to
patients with cancer that addresses the greatest medical need -
aggressive and advanced-stage cancers for which current treatments are
inadequate. ARIAD also has an exclusive license to pioneering
technology and patents related to certain NF-(kappa)B treatment
methods, and the discovery and development of drugs to regulate
NF-(kappa)B cell-signaling activity, which may be useful in treating
certain diseases. Additional information about ARIAD can be found on
the web at http://www.ariad.com.

    Some of the matters discussed herein are "forward-looking
statements" within the meaning of the Private Securities Litigation
Reform Act of 1995. Such statements are identified by the use of words
such as "anticipate," "estimate," "expect," "project," "intend,"
"plan," "believe," and other words and terms of similar meaning in
connection with any discussion of future operating or financial
performance. Such statements are based on management's current
expectations and are subject to certain factors, risks and
uncertainties that may cause actual results, outcome of events, timing
and performance to differ materially from those expressed or implied
by such forward-looking statements. These risks include, but are not
limited to, risks and uncertainties regarding the Company's ability to
accurately estimate the actual research and development expenses and
other costs associated with the preclinical and clinical development
of our product candidates, the adequacy of our capital resources and
the availability of additional funding, risks and uncertainties
regarding the Company's ability to successfully conduct preclinical
and clinical studies of its product candidates, risks and
uncertainties that clinical trial results, such as those noted in this
press release, at any phase of development may be adverse or may not
be predictive of future result or lead to regulatory approval of any
of the Company's product candidates, and risks and uncertainties
relating to regulatory oversight, intellectual property claims, the
timing, scope, cost and outcome of legal proceedings, future capital
needs, key employees, dependence on the Company's collaborators and
manufacturers, markets, economic conditions, products, services,
prices, reimbursement rates, competition and other risks detailed in
the Company's public filings with the Securities and Exchange
Commission, including ARIAD's Annual Report on Form 10-K for the
fiscal year ended December 31, 2003. The information contained in this
document is believed to be current as of the date of original issue.
The Company does not intend to update any of the forward-looking
statements after the date of this document to conform these statements
to actual results or to changes in the Company's expectations, except
as required by law.

    CONTACT: ARIAD Pharmaceuticals, Inc.
             Tom Pearson, 610-407-9260
             or
             Kelly Lindenboom, 617-621-2345