PTC Therapeutics
May 6, 2014

PTC Therapeutics Reports First Quarter Financial Results and Provides Corporate Update

-Conference Call Today at 4:30 pm ET-

PTC Therapeutics Reports First Quarter Financial Results and Provides Corporate Update

-Conference Call Today at 4:30 pm ET-

SOUTH PLAINFIELD, NJ - May 6, 2014 - PTC Therapeutics, Inc. (NASDAQ: PTCT) today announced a corporate update and reported its financial results for the first quarter ended March 31, 2014.

"We are happy to report on the progress we have made in the first quarter of 2014 on each of the clinical, regulatory and corporate fronts. Our successful follow-on financing provides a strong foundation to advance our clinical programs and further PTC's pipeline of product candidates," stated Stuart W. Peltz, Ph.D., Chief Executive Officer, PTC Therapeutics, Inc. "As we look ahead, we are excited to complete enrollment in our confirmatory Phase 3 ACT DMD clinical trial in nonsense mutation Duchenne muscular dystrophy, initiate our confirmatory Phase 3 clinical trial in nonsense mutation cystic fibrosis, and advance our SMA program, partnered with Roche and the SMA Foundation. We also plan to pursue additional indications for ataluren beyond nmDMD and nmCF and expect to initiate a Phase 2 proof-of-concept study for an additional indication in the second half of this year."

Corporate Highlights:

First Quarter 2014 Financial Highlights:

Today's Conference Call and Webcast Reminder
The PTC management team will host a conference call to discuss the company's financial results and recent and upcoming developments today, Tuesday, May 6, 2014, at 4:30 p.m. ET. The call can be accessed by dialing (877) 303-9216 (domestic) or (973) 935-8152 (international) five minutes prior to the start of the call and providing the passcode 33834345.

The live, listen-only webcast of the conference call can also be accessed by visiting the "Investors Relations" section of the company's website at A replay of the webcast will be archived on the PTC website for 30 days following the call.

PTC is a biopharmaceutical company focused on the discovery and development of orally administered, proprietary small molecule drugs that target post-transcriptional control processes. Post-transcriptional control processes regulate the rate and timing of protein production and are essential to proper cellular function. PTC's internally discovered pipeline addresses multiple therapeutic areas, including rare disorders, oncology and infectious diseases. PTC has developed proprietary technologies that it applies in its drug discovery activities and which form the basis for collaborations with leading biopharmaceutical companies. For more information on the company, please visit our website

Jane Baj
+1 (908) 912-9167

This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. All statements, other than those of historical fact, contained in this release, including statements regarding the future expectations, plans and prospects for PTC, our Phase 3 clinical trials for ataluren in nmDMD and nmCF, our collaboration in SMA with Roche and the SMA Foundation, our current and planned regulatory filings with the EMA, the timing of the re-examination of the CHMP opinion, our earlier stage programs, including our initiation of a potential proof-of-concept study, our strategy, future operations, future financial position, future revenues or projected costs, the development of and potential market for PTC's product candidates, and objectives of management, are forward-looking statements. Other forward-looking statements may be identified by the words "plan," "guidance," "anticipate," "believe," "estimate," "expect," "intend," "may," "predict," "project," "target," "potential," "will," "would," "could," "should," "continue," and similar expressions.

Our actual results, performance or achievements could differ materially from those expressed or implied by forward-looking statements we make as a result of a variety of risks and uncertainties, including those related to the initiation and conduct of clinical trials, availability of data from clinical trials, expectations for regulatory approvals, our scientific approach and general development progress, the availability or commercial potential of our product candidates and the factors discussed in the "Risk Factors" section of our Annual Report on Form 10-K for the fiscal year ended December 31, 2013, which is on file with the Securities and Exchange Commission. You are urged to carefully consider all such factors. The forward-looking statements contained herein represent PTC's views only as of the date of this press release, and we do not undertake or plan to update or revise any such forward-looking statements to reflect actual results or changes in plans, prospects, assumptions, estimates or projections, or other circumstances occurring after the date of this release.