ViaCell Reports Second Quarter 2007 Financial
                               Results

    CAMBRIDGE, Mass.--Aug. 9, 2007--ViaCell, Inc. (Nasdaq: VIAC) today
announced its consolidated financial and operating results for the
second quarter ended June 30, 2007.

    Sales of ViaCord(R), ViaCell's product for the preservation of
umbilical cord blood, generated revenues of $15.7 million in the
second quarter of 2007, representing an 18% increase over the $13.4
million of ViaCord revenues in the same period in 2006. The Company's
net loss for the second quarter of 2007 was $3.3 million, or $0.09 per
share, compared to a net loss of $6.9 million, or $0.18 per share, for
the corresponding period in 2006.

    "ViaCell remains focused on revenue growth and profitability and
we believe the Company is well-positioned to achieve both," said Marc
D. Beer, President and Chief Executive Officer of ViaCell. "Our team
continues to execute on our growth and marketing strategies and we
believe we are on track to become cash flow positive in the first half
of 2008."

    Revenue and Margin Growth

    The reported increase in sales reflects continued increases in
both processing and storage revenues from ViaCord. Underlying the
increased revenues was a record level of cord blood units processed
resulting from multiple sales and marketing initiatives, including
increased enrollments derived from our field sales efforts through
education of medical professionals, repeat customers and early-stage
traction from the Company's Mothers Work collaboration.

    Gross margin from ViaCord sales for the second quarter of 2007 was
83.3% of product revenues compared to 81.0% in the second quarter of
2006. The increase in gross margin reflects multiple factors,
including economies of scale resulting from higher revenue levels and
higher average selling price.

    Expense Management

    Total operating expenses in the second quarter of 2007 were $19.7
million compared to $21.2 million for the same period in 2006.

-- Research and development expenses for the second quarter of 2007
   were $2.7 million compared to research and development expenses of
   $3.7 million for the second quarter of 2006 reflecting project
   prioritization and expense control. The Company's research and
   development expenses in the second quarter of 2007 included:

    -- Pivotal clinical trial for ViaCyte(TM), an investigational
       product to extend and protect fertility through the
       cryopreservation and thawing of human oocytes;
    -- Preclinical testing of the use of ViaCell's proprietary cord
       blood derived Unrestricted Somatic Stem Cells (USSC) as a
       potential treatment for cardiac disease under its collaboration
       with Centocor Research and Development, Inc., a Johnson &
       Johnson company; and
    -- Various activities to continue supporting and expanding the
       Company's innovative and differentiated cord blood product
       line.

Separated from research and development expenses, and reported in the
Company's operating statement as in-process research and development,
was a further reduction in expenses from a $2.2 million credit related
to a reduction in contingent liabilities recorded with the acquisition
of Kourion Therapeutics in 2003.

-- Sales and marketing expenses for the second quarter of 2007 were
   $11.9 million compared to sales and marketing expenses of $10.0
   million in the second quarter of 2006. The increase in sales and
   marketing expenses is a direct result of ViaCell's investments in
   ViaCord sales and marketing initiatives, including its Mothers Work
   collaboration which commenced in the first quarter of 2007. The
   increase also reflects the Company's strategy to increase focus on
   marketing ViaCord to medical professionals, which the Company
   believes will provide significant and long-term sustainable value.

-- General and administrative expenses for the second quarter of 2007
   were $4.3 million compared to $5.0 million in the second quarter of
   2006.

    As of June 30, 2007, ViaCell had $44.0 million in cash, cash
equivalents, and investments as compared to $47.4 million as of March
31, 2007.

    The Company expects to become cash flow positive in the first half
of 2008. In addition, the Company anticipates that revenues will
accelerate in the second half of 2007 and its full year 2007 revenues
will be within the mid- to high-sixty million dollar range.

    Operating Highlights

    ViaCell realized multiple accomplishments to support future growth
and advancement of its business. The following is a summary of select
highlights.

-- Enrollment Advancing in ViaCyte Pivotal Trial. ViaCell received FDA
   approval of its Investigational Device Exemption (IDE) supplement
   in July 2007 for its ViaCyte(SM) pivotal clinical study. FDA
   approval of the IDE supplement allows the Company to enroll women
   into the study and commence in vitro fertilization treatment. The
   study is expected to be completed in 2009.

-- ViaCell Prevails in PharmaStem Patent Appeal. On July 9, 2007, the
   U.S. Court of Appeals for the Federal Circuit ruled that ViaCell
   does not infringe two PharmaStem Therapeutics U.S. patents which
   relate to certain aspects of collection, cryopreservation, storage
   and use of hematopoietic stem cells derived from umbilical cord
   blood. The Federal Circuit also found these patents to be invalid
   based on prior art. PharmaStem has filed a petition seeking review
   of the decision by the full panel of Federal Circuit judges.

-- 100th Cord Blood Transplant Performed. ViaCell and Children's
   Hospital Oakland Research Institute (CHORI) achieved their combined
   100th umbilical cord blood transplant. ViaCell and CHORI combined
   their efforts in the area of enabling directed transplants using
   sibling donor umbilical cord blood to form the Sibling Connection
   Program in 2006. Data from these first 100 umbilical cord blood
   transplants demonstrated excellent survival rates and other key
   measurements of transplant success. Cord blood transplantation has
   been successfully used to treat over 40 diseases, including various
   forms of cancer, metabolic disorders and immunodeficiencies.

-- Commencement of Preclinical Study in Cardiac Disease. During the
   second quarter of 2007, ViaCell began an efficacy preclinical study
   in a large animal model under its collaboration with Centocor
   Research and Development. The preclinical study will evaluate the
   delivery of ViaCell's cord blood-derived multi-potent stem cells
   with the MyoStar(TM) Injection Catheter and NOGA(R) XP Cardiac
   Navigation System as a potential treatment for cardiac disease.
   ViaCell expects to generate data from this preclinical cardiac
   study by late 2007 to determine whether to advance the program
   toward human clinical trials.

-- John Thero Named CFO. John Thero joined ViaCell in June 2007 as
   Senior Vice President, Finance and Chief Financial Officer. Mr.
   Thero brings more than 20 years of senior financial and operational
   management experience, the majority of which has been in the life
   sciences industry.

    Conference Call and Webcast

    ViaCell will host a conference call and live audio webcast with
investment analysts today, August 9, 2007, at 10:00 a.m. Eastern Time
to discuss its second quarter financial results. To participate by
telephone, dial (719) 457-2693. A live audio webcast can be accessed
on the ViaCell website at http://www.viacellinc.com within the
Investor Information section.

    A replay of this conference call will be available for two weeks,
beginning August 9, 2007 at 1:00 p.m. Eastern Time by dialing (719)
457-0820 and using the access code 1749275. In addition, a replay of
the webcast will be archived on the ViaCell website in the Investor
Information section.

    About ViaCell

    ViaCell, Inc. is a biotechnology company dedicated to enabling the
widespread application of human cells as medicine. The Company markets
ViaCord(R), a product offering through which families can preserve
their baby's umbilical cord blood at the time of birth for possible
future medical use in treating over 40 diseases including certain
blood cancers and genetic diseases. ViaCell also conducts research and
development primarily to investigate other potential therapeutic uses
of umbilical cord blood-derived stem cells and on technology for
expanding populations of these cells. ViaCell's pipeline is focused in
the areas of cancer, cardiac disease, diabetes and fertility.
Additional information about ViaCell is available online at
http://www.viacellinc.com.

    Risks of Forward-Looking Statements

    This press release contains forward-looking statements regarding
the Company's financial outlook, including anticipated levels of 2007
revenues and revenue growth in general, profitability, plans to become
cash flow positive in the first half of 2008 and the value of its
investments into marketing to medical professionals, and the plans for
its research and development programs. These statements are based on
management's current expectations, and are subject to a number of
risks and uncertainties that could cause actual results to differ
materially from the Company's current expectations. For example, the
Company's financial performance and its ability to achieve its
expectations for growth and stated financial goals may be negatively
affected by the impact of competition in the umbilical cord
preservation industry, any changes in market acceptance for family
cord blood banking, any slowing of growth of the family cord blood
banking market, the impact of any potential adverse outcome in pending
patent infringement litigation related to the cord blood preservation
business, any further impact of a third party's dispute with Mothers
Work related to the rights granted to the Company, including if a
court were to vacate the arbitrator's decision, any unexpected
material issues, delays or failures in the collection, processing or
storage of umbilical cord blood by the Company or others in the
industry, and by fluctuations in the level and timing of expenses,
including as a result of difficulties or delays in the development of
the Company's product candidates, new licensing deals, collaborations,
or other strategic efforts, adverse developments related to pending
litigation or other disputes, or any other unexpected events. The
development of product candidates and product offerings like those
being developed by ViaCell involves a high degree of risk. The success
of the Company's development programs and the potential for new
products could be negatively impacted by a number of factors,
including new data regarding the safety or efficacy of the Company's
product candidates or offerings, unexpected delays, technical or
intellectual property hurdles, manufacturing issues or delays, or
unexpected concerns or requirements raised by regulatory authorities,
institutional review boards or clinical trial sites. The Company's
long-term financial performance and growth is dependent on the
Company's ability to bring new products to the marketplace. Currently,
most of the Company's product candidates are at an early stage of
development. There can be no assurance that the Company will be
successful in its efforts to develop these or other products. For more
detailed information on the risks and uncertainties associated with
these forward-looking statements and the Company's other activities,
see the periodic reports filed by the Company with the Securities and
Exchange Commission. The Company does not undertake any obligation to
publicly update any forward-looking statements, whether as a result of
new information, future events, or otherwise.

           Condensed Consolidated Statements of Operations
                (in thousands, except per share data)
                             (unaudited)

                                   Three Months     Six Months Ended
                                       Ended            June 30,
                                     June 30,
                                 ----------------- -------------------
                                   2007     2006     2007      2006

Processing and storage revenues  $15,729  $13,362  $ 30,092  $ 25,299
Grant revenues                        --      177        95       320
                                 -------- -------- --------- ---------
Total revenues                    15,729   13,539    30,187    25,619
Operating expenses:
 Cost of processing and storage
  revenues                         2,623    2,536     5,263     4,864
  Research and development         2,710    3,660     5,988     7,126
  Sales and marketing             11,908    9,995    23,029    17,916
  General and administrative       4,316    5,013     9,116     9,650
  In-process research and
   development                    (2,155)      --    (2,155)       --
Restructuring                        267       --       267      (180)
                                 -------- -------- --------- ---------
Total operating expenses          19,669   21,204    41,508    39,376
     Loss from operations         (3,940)  (7,665)  (11,321)  (13,757)
Interest income (expense):
Interest income                      613      803     1,312     1,527
Interest expense                      --      (17)       (2)      (43)
                                 -------- -------- --------- ---------
   Total interest income, net        613      786     1,310     1,484
Loss before cumulative effect of
 change in accounting principle   (3,327)  (6,879)  (10,011)  (12,273)
Cumulative effect of change in
 accounting principle                 --       --        --       283
                                 -------- -------- --------- ---------
Net loss                         $(3,327) $(6,879) $(10,011) $(11,990)
                                 ======== ======== ========= =========
Net loss per share:
Loss per share before cumulative
 effect of change in accounting
 principle, basic and diluted    $ (0.09) $ (0.18) $  (0.26) $  (0.32)
Cumulative effect of change in
 accounting principle                 --       --        --      0.01
                                 -------- -------- --------- ---------
Net loss per common share, basic
 and diluted                     $ (0.09) $ (0.18) $  (0.26) $  (0.31)
                                 ======== ======== ========= =========
Weighted average shares used in
 basic and diluted net loss per
 share computation                38,784   38,367    38,725    38,329

              Condensed Consolidated Balance Sheet Data
                            (in thousands)
                             (unaudited)

                                                 June 30, December 31,
                                                   2007       2006
                                                 -------- ------------

Cash, cash equivalents and investments           $ 43,958 $     51,245
Accounts receivable, net                           13,426       12,616
Other current assets                                2,264        2,008
Property & equipment, net                           7,902        8,376
Intangible assets, net                              6,142        6,242
Other assets                                        1,795        1,795
                                                 -------- ------------
          Total assets                           $ 75,487 $     82,282
                                                 ======== ============

Current liabilities                                18,508       17,865
Deferred revenue & rent                            20,850       17,918
Contingent purchase price                           6,000        8,155
Long-term debt                                         14           27
  Stockholders' equity                             30,115       38,317
                                                 -------- ------------
     Total liabilities and stockholders' equity  $ 75,487 $     82,282
                                                 ======== ============

    ViaCell(R) and ViaCord(R) are registered trademarks and
ViaCyte(SM) is a service mark of ViaCell, Inc.

    --30--

    CONTACT: ViaCell, Inc.
             Justine E. Koenigsberg, 617-914-3494
             Senior Director, Corporate Communications