SULLIVAN & WORCESTER LLP
                               1666 K STREET, N.W.
                             WASHINGTON, D.C. 20006
                             TELEPHONE: 202-775-1200
                             FACSIMILE: 202-293-2275

1290 AVENUE OF THE AMERICAS                      ONE POST OFFICE SQUARE
29th FLOOR                                       BOSTON, MASSACHUSETTS 02109
NEW YORK, NEW YORK 10104                         TELEPHONE: 617-338-2800
TELEPHONE: 212-660-3000                          FACSIMILE: 617-338-2880
FACSIMILE: 212-660-3001

                                                  January 4, 2008


  EDGAR Operations Branch
  Division of Investment Management
  U.S. Securities and Exchange Commission
  100 F Street, N.E.
  Washington, DC 20549

         Re:      Met Investors Series Trust
                  Lazard Mid-Cap Portfolio
                  Form N-14 Registration Statement
                  File No. 333-147928

  Ladies and Gentlemen:

     This letter is in response to certain  comments  from Ms.  Allison White of
the Staff with respect to the Trust's Registration  Statement on Form N-14 filed
with the  Commission  on December 7, 2007.  Our  response to certain  accounting
related  comments  will  be in a  separate  letter.  Where  noted,  changes,  as
applicable,   have  been  made  to  the  Prospectus/Proxy  Statement.  All  page
references  refer to the pages of these documents which have been marked to show
changes from the previous versions included in the Registration Statement.

1.   Comment:  In the first  sentence  of the first  paragraph  under the bullet
     points  on page 2 of the  prospectus/proxy  statement,  add the  word  "of"
     immediately after the phrase "all the assets".

     Response: The requested change has been made on page 2.

2.   Comment:  In the  penultimate  paragraph on page 2 of the  prospectus/proxy
     statement, explain what synthetic instruments are and describe the types of
     synthetic  instruments that Lazard Mid-Cap Portfolio may use to comply with
     the 80% investment requirement.

     Response:  The requested  additional  disclosure  has been added to page 2.


3.   Comment: On pages 17 through 20 of the prospectus/proxy statement, identify
     additional   risks,   if  any,   associated  with  investing  in  synthetic
     instruments.

     Response:  Risk disclosure  with respect to synthetic  instruments has been
     added to page 20.

4.   Comment: Page 13 of the prospectus/proxy statement shows year-by-year total
     returns  for  Lazard  Mid-Cap  Portfolio  beginning  in 2003 but the lowest
     quarter  returns for that  Portfolio  are shown as  occurring  in the third
     quarter of 2002. Please make the appropriate correction to this disclosure.

     Response:   Performance   information  for  2002  has  been  added  to  the
     year-by-year total returns of Lazard Mid-Cap (page 13).

5.   Comment:  Page 14 of the prospectus/proxy  statement shows prior experience
     with a comparable  fund. If Lazard Asset  Management  LLC manages any other
     funds with similar investment  objectives and strategies to those of Lazard
     Mid-Cap Portfolio,  supplementally  include a representation that it is not
     misleading  to  omit  the   performance  of  those  other  funds  from  the
     prospectus/proxy statement.

     Response:  The  use of  prior  experience  with a  comparable  fund  in the
     Prospectus/Proxy  Statement is the same  disclosure as found in the current
     prospectus  for  Lazard  Mid-Cap.   Since  the  Portfolio  and  the  Lazard
     comparable  fund are  managed  in  substantially  similar  ways,  it is not
     misleading to present just the result of the  comparable  fund instead of a
     composite of funds managed in the mid-cap strategy.

6.   Comment:  On page 15 of the  prospectus/proxy  statement,  define  the term
     "Manager" again.

     Response: The requested definition has been added to page 15.

7.   Comment:   The   discussion  of  the  federal  tax   consequences   of  the
     reorganization that is required by Item 3 of Form N-14 should appear in the
     prospectus/proxy statement before the performance information.

     Response:  The format for the Prospectus/Proxy  Statement has been utilized
     by Met Investors  Series Trust for over five years.  The most important tax
     consequence  of the  Reorganization  is  whether  or not it is tax free.  A
     statement to the effect that the Reorganization is structured as a tax-free
     reorganization  for federal  income tax purposes is found in the Summary on
     page 6  under  the  section  titled  "What  are  the  key  features  of the
     Reorganization?" This section is before the section on performance.


8.   Comment: Provide the accountant's consent dated within 5 days of the filing
     date.

     Response:  The  consent  of  Deloitte  &  Touche  LLP will be  included  in
     Post-Effective Amendment No. 1.

9.   Comment: Include Tandy language in your response letter.

     Response: The requested language is included in this letter.

     In connection with this filing,  the Trust acknowledges that: (1) the Trust
is  responsible  for the adequacy and accuracy of the disclosure in the filings;
(2) staff comments or changes to disclosure in response to staff comments in the
filings  reviewed by the staff do not foreclose the  Commission  from taking any
action with respect to filing;  (3) the Trust may not assert staff comments as a
defense in any  proceeding  initiated by the  Commission or any person under the
federal securities laws of the United States.

     The Trust expects to file a 485(b) filing on January 7, 2008.


     If you have any questions, please feel free to call me at (202) 775-1205.


                                           Very truly yours,


                                           /s/ Robert N. Hickey
                                           -----------------------
                                           Robert N. Hickey


Attachments

cc:      Elizabeth Forget
         Jack Huntington
         John Rizzo


     o    "Record Holder" of Batterymarch Mid-Cap Stock refers to each Insurance
          Company  which holds  Batterymarch  Mid-Cap  Stock's  shares of record
          unless indicated otherwise in this Prospectus/Proxy Statement;

     o    "shares" refers generally to your shares of beneficial interest in the
          Portfolio; and

     o    "shareholder" or "Contract Owner" refers to you.


         In the Reorganization, all of the assets of Batterymarch Mid-Cap Stock
will be acquired by Lazard Mid-Cap in exchange for Class A shares of Lazard
Mid-Cap and the assumption by Lazard Mid-Cap of the liabilities of Batterymarch
Mid-Cap Stock (the "Reorganization"). If the Reorganization is approved, Class A
shares of Lazard Mid-Cap will be distributed to each Record Holder in
liquidation of Batterymarch Mid-Cap Stock, and Batterymarch Mid-Cap Stock will
be terminated as a series of the Trust. You will then hold that number of full
and fractional shares of Lazard Mid-Cap which have an aggregate net asset value
equal to the aggregate net asset value of your shares of Batterymarch Mid-Cap
Stock.


         Batterymarch Mid-Cap Stock and Lazard Mid-Cap are each separate
diversified series of the Trust, a Delaware statutory trust, which is registered
as an open-end management investment company under the Investment Company Act of
1940, as amended (the "1940 Act"). The investment objective of Batterymarch
Mid-Cap Stock is substantially similar to that of Lazard Mid-Cap, as follows:

- --------------------------------------- -----------------------------
           Portfolio                  Investment Objective
- --------------------------------------- -----------------------------
- ---------------------------------------------------------------------
Batterymarch Mid-Cap Stock            Growth of capital
- ---------------------------------------------------------------------
- ---------------------------------------------------------------------
Lazard Mid-Cap                        Long-term growth of capital
- ---------------------------------------------------------------------


     The  investment  strategies for  Batterymarch  Mid-Cap Stock are similar to
those of Lazard  Mid-Cap:  each invests at least 80% of its assets in the equity
securities   of  companies   with  medium   market   capitalizations.   However,
Batterymarch  Mid-Cap Stock does not  anticipate  that foreign  securities  will
exceed 20% of its net assets  while  Lazard  Mid-Cap may invest up to 25% of its
total assets in foreign  securities.  In addition,  Lazard Mid-Cap may invest in
synthetic  instruments  in  complying  with  its  80%  investment   requirement.
Synthetic instruments are instruments that have economic characteristics similar
to the  Portfolio's  direct  investment,  and  may  include  warrants,  futures,
options,  exchange-traded  funds and American Depositary Receipts.  Further, the
weighted average market  capitalization of companies invested in by Batterymarch
Mid-Cap Stock as of September 30, 2007 was $6.4 billion compared to the weighted
average market of $6.8 billion of companies invested in by Lazard Mid-Cap.


     This  Prospectus/Proxy  Statement  explains concisely the information about
Lazard  Mid-Cap that you should know before voting on a  Reorganization.  Please
read it  carefully  and keep it for  future  reference.  Additional  information
concerning  each  Portfolio  and  Reorganization  is contained in the  documents
described  below,  all of which have been filed with the Securities and Exchange
Commission ("SEC"):



Portfolio, which may have occurred before your Contract began; accordingly, your
investment  results may differ.  Each Portfolio can also  experience  short-term
performance  swings as indicated in the high and low quarter  information at the
bottom of each chart.





                           Batterymarch Mid-Cap Stock
- ------------ --------- ----------- ----------- ----------- ---------- ---------- --------- --------- ----------

                                                                            

  16.91%      13.38%     16.61%      -4.02%     -14.32%     33.75%     16.45%     12.41%    5.67%      6.06%
                                                                                                       =====




    98          99         00          01          02         03         04         05        06        07
- ------------ --------- ----------- ----------- ----------- ---------- ---------- --------- --------- ----------
                              High Quarter 4th  - 1998     + 26.68%
                              Low Quarter: 3rd - 2001      - 16.71%


                                 Lazard Mid-Cap

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

     -10.18%         26.42%      14.60%      8.40%      14.78%     -2.47%
     =======                                                       ======


       02

                       03          04         05          06         07
- ------------------ ----------- ----------- ---------- ----------- ----------

                                 High Quarter: 2nd  - 2003 +  15.50%
                                 Low Quarter:  3rd -  2002  -  14.30%



     The next set of tables lists the average annual total return of the Class A
shares of  Batterymarch  Mid-Cap  Stock for the past  one-,  five- and  ten-year
periods (through  December 31, 2007), and the average annual total return of the
Class A shares of Lazard  Mid-Cap  for the past one- and  five-year  periods and
since inception (through December 31, 2007). These tables include the effects of
Portfolio  expenses and are intended to provide you with some  indication of the
risks of  investing  in each  Portfolio by  comparing  its  performance  with an
appropriate widely recognized index of securities, a description of which can be
found following the table. An index does not reflect fees or expenses. It is not
possible to invest directly in an index.





         Average Annual Total Return (for the period ended 12/31/07)

- ----------------------------- -------------- ---------------- ------------------
                                 1 Year          5 Years          10 Years
                                                         

Batterymarch Mid-Cap Stock
- ----------------------------- -------------- ---------------- ------------------
- -------------------------------------------------------------------------------

Class A                         6.06%          14.44%             9.58%
                                ====           =====              ====

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

S&P MidCap 400 Index            7.98%          16.20%            11.19%
                                ====           =====             =====

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







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


                                                                       
                                                               Since Inception     Inception Date
Lazard Mid-Cap                   1 Year          5 Year
- ----------------------------- -------------- ---------------- ------------------- ------------------
- ---------------------------------------------------------------------------------------------------

Class A                        -2.47%          11.96%             7.91%              1/2/02
                               =====           =====              ====

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

Russell Midcap Index            5.60%          18.21%            11.63%
                                ====           =====             =====

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





     Important   information   about  Lazard   Mid-Cap  is  also   contained  in
management's  discussion of Lazard  Mid-Cap's  performance  which appears in the
most recent Annual Report and Semi-Annual Report of the Trust relating to Lazard
Mid-Cap.

Who will be the investment adviser of my Portfolio after the Reorganization?
What will the management and advisory fees be after the Reorganization?

         Management of the Portfolios

         The overall management of Batterymarch Mid-Cap Stock and Lazard Mid-Cap
is the responsibility of, and is supervised by, the Board of Trustees of the
Trust.

         Manager


         Met Investors Advisory, LLC (the "Manager") selects and pays the fees
of the Adviser for each Portfolio and monitors the Adviser's investment program.
MetLife Investors Group, Inc., an affiliate of MetLife, owns all of the
outstanding common shares of the Manager.


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

         Facts about the Manager:

          o    The Manager is an affiliate of MetLife.

          o    The  Manager  manages  a family  of  investment  portfolios  sold
               primarily to separate  accounts of MetLife and its  affiliates to
               fund  variable  life  insurance  contracts  and variable  annuity
               certificates and contracts,  with assets of  approximately  $37.2
               billion as of September 30, 2007.

          o    The  Manager is  located at 5 Park  Plaza,  Suite  1900,  Irvine,
               California  92614.
               -----------------------------------------------------------------


         Adviser

         Lazard Asset Management LLC or "Lazard" (the "Adviser") is the
investment adviser to Lazard Mid-Cap. Pursuant to an Advisory Agreement with the
Manager, the Adviser continuously furnishes an investment program for the
Portfolio, makes day-to-day investment decisions on behalf of the Portfolio, and
arranges for the execution of Portfolio transactions.


- -------------------------------------------------------------------------------
 Facts about the Adviser:

o    The Adviser and its global affiliates provide investment management
     services to client discretionary accounts with assets totaling
     approximately $127.7 billion as of September 30, 2007.



     Different  investment  styles  tend to shift in and out of favor  depending
upon market and economic conditions as well as investor  sentiment.  A Portfolio
may outperform or  underperform  other funds that employ a different  investment
style.  A Portfolio may also employ a combination of styles that impact its risk
characteristics.  Examples of different  investment  styles  include  growth and
value  investing.  Growth stocks may be more volatile than other stocks  because
they are more sensitive to investor  perceptions of the issuing company's growth
of earnings  potential.  Also,  since  growth  companies  usually  invest a high
portion of earnings in their  business,  growth stocks may lack the dividends of
value stocks that can cushion stock prices in a falling market.  Growth oriented
funds will typically underperform when value investing is in favor. Value stocks
are those  which are  undervalued  in  comparison  to their peers due to adverse
business  developments or other factors.  Value investing  carries the risk that
the market will not  recognize a security's  inherent  value for a long time, or
that a stock judged to be undervalued  may actually be  appropriately  priced or
overvalued.  Value  oriented  funds  will  typically  underperform  when  growth
investing is in favor.

Are there any other risks of investing in each Portfolio?


     In complying with Lazard  Mid-Cap's 80%  investment  requirement in mid-cap
companies,  the  Portfolio's  investments  may  include  synthetic  (derivative)
instruments.  The  Portfolio's  investments  in  derivatives  can  significantly
increase  the  Portfolio's  exposure  to  market  risk  or  credit  risk  of the
counterparty.  Derivatives  can also involve the risk of  mispricing or improper
valuation  and the risk  that  changes  in the value of the  derivative  may not
correlate perfectly with the relevant assets rates or indices.


         Batterymarch Mid-Cap Stock's portfolio turnover rates may exceed 100%.
High portfolio turnover rates generally mean greater brokerage costs which can
already affect a Portfolio's performance. The portfolio turnover rates for
Lazard Mid-Cap are expected to be under 100%.

                  INFORMATION ABOUT THE REORGANIZATION

Reasons for the Reorganization

     The  Reorganization  is part of an  overall  plan to reduce  the  number of
portfolios with overlapping  investment  objectives and policies in the families
of funds which serve as funding  vehicles for insurance  contracts issued by the
Insurance Company and its affiliates. Reduction in the number of such portfolios
is an attempt to improve the  operating  efficiencies  of the Trust's  remaining
portfolios.

     At a regular  meeting held on November 6, 2007,  all of the Trustees of the
Trust,   including  the  Independent  Trustees,   considered  and  approved  the
Reorganization;  they  determined  that  the  Reorganization  was  in  the  best
interests of shareholders of Batterymarch  Mid-Cap Stock, and that the interests
of existing  shareholders of Batterymarch Mid-Cap Stock will not be diluted as a
result of the transactions contemplated by the Reorganization.