EXHIBIT 99.1

CUBIST PHARMACEUTICALS, INC. (CBST)


September 17, 2002,  10:00 am CT
Moderator:  Tom Dietz

Operator:             At this time I would like to welcome everyone to the
                      Pacific Growth Equities conference with Cubist
                      Pharmaceuticals. All lines have been placed on mute to
                      prevent any background noise.

                      After the speaker's remarks there will be a question and
                      answer period. If you would like to ask a question during
                      this time simply press star then the number 1 on your
                      telephone key pad. If you would like to withdraw your
                      question press the pound key.

                      Thank you I would now like to turn the call over to Dr.
                      Tom Dietz. Mr. Dietz you may proceed.

Tom Dietz:            Thank you welcome to all of you on today's conference
                      call. I'm Tom Dietz. I'm the Director of Research here at
                      Pacific Growth Equities and the Head of the Biotechnology
                      Research Team.

                      We're pleased to have on today's call several of the
                      members of Cubist Pharmaceuticals senior management team.
                      On this morning's call will be Dr. Scott Rocklage,
                      Chariman and CEO, Mike Bonney, President and COO, Tom
                      Shea, CFO, Oliver Fetzer, Sr. VP of Business Development
                      and Jennifer LaVin, the Senior Director of Corporate
                      Communications. Welcome to the Company.




                      As a brief background Cubist is a late-state emerging
                      pharmaceutical company focused in the anti-infective
                      space. Cubist's current market cap is approximately $140
                      million. The company had cash of approximately $195
                      million as of the end of Q2 of which debt is approximately
                      $165 million.

                      Pacific Growth Equities estimates for Cubist's 2002 fiscal
                      year burn is $83 million. The Company's lead product is
                      Cidecin(R). It's a cidal antibiotic being developed for
                      serious Gram-positive infections.

                      Cidecin(R) produced positive Phase III data in two
                      double-blind placebo controlled international Phase III
                      trials in complicated skin and soft tissue infections, but
                      did not achieve success in studies in community-acquired
                      pneumonia.

                      Recently Gilead Sciences and Cubist parted company for a
                      European marketing distribution deal and a number of
                      questions are being asked about the viability of
                      Cidecin(R) and Cubist plus the unsuccessful cap study and
                      the Gilead deal termination.

                      Cubist's management has been kind enough today to offer
                      their time to answer questions regarding these topics. I'd
                      like to start with a few questions from my team and then
                      open the call up for the other conference call
                      participants.

                      Scott thank you again for your team being available this
                      morning.

Scott Rocklage:       You bet.

Tom Dietz:            My questions start out with three broad areas. The first
                      is and I'll ask these and let you answer after each one
                      rather than going through all three. The first




                      is could you explain in greater detail why Gilead and
                      Cubist's parted company.

                      Why did they chose not to go forward with a single
                      indication filing in Europe when Cubist made the decision
                      to do so in the United States and now in Europe, and could
                      you put that answer in light of any Cubist's discussions
                      with European regulatory authorities and the competition.

Scott Rocklage:       Sure. Really the whole Gilead alliance was driven
                      initially by the ability to align the Cidecin(R)product
                      profile with the marketplace in which the current Gilead
                      products in Europe, in this case AmBisome(R), was focused.

                      As we began looking at the Cidecin(R) package post SST and
                      cap clinical trial news, we understood from market
                      research that there was a change in sales force target
                      audience.

                      This change was driven by the fact that there was a
                      significant increase in perceived value of the drug by
                      surgeons and Gilead did not have a force that's directed
                      towards the surgical area nor was considering investing in
                      that particular area.

                      So that's one set of issues. The second set of issues
                      related to regulatory issues which were focused on which
                      are the potential rapporteur countries for a product like
                      this and we looked at the UK, we looked at Sweden and we
                      looked at France, because Gilead has experience with and
                      significant loyalty to France.

                      And our perception was that France embraced the product in
                      general but desired more clinical data and it was also our
                      perception that Sweden and the UK response was much more
                      accepting than the French response.




                      But Gilead was unwilling to really consider rapporteur
                      countries other than France and that led to a potential
                      delay in filing if we kept it in the form of a
                      partnership.

                      So the consequence of that, we decided together to do
                      what's best for Cidecin(R) and the respective companies,
                      and Cubist wanted to regain both strategic and operational
                      control in Europe.

                      So we're in a position now where we can repartner the
                      European rights potentially down the road but we have
                      committed to filing the European NDA ourselves and not
                      look for a partner in that process.

Tom Dietz:            Well, considering Gilead's commitment in the beginning and
                      the dollars that were put into Cubist, why would they now
                      be willing to relinquish that with no rights back to them
                      for having paid money but having done nothing at this
                      point?

Scott Rocklage:       Well, the money that were invested today were
                      based upon upfront money and then of course milestones
                      that we achieved along the way, so those were obligated
                      according to the contract.

                      But in order for Gilead to successfully market this drug
                      in their view they would want to go ahead and use France
                      as a rapporteur. We certainly didn't want to commit to
                      that and they would have to invest in a sales force that's
                      not their current target focus.

                      And combining the need for that investment and the new
                      economic model that resulted as a consequence of not
                      having the community-acquired pneumonia data available as
                      part of the launch and ultimately as a bridge to other




                      indications such as Nosocomial Pneumonia, and the fact
                      that there was tremendous success being enjoyed by Gilead
                      with tenofovir.

                      They wanted to commit to drill down in those areas of
                      antivirals and not make the investment in going into a new
                      area of antibacterials that they couldn't appropriately
                      leverage with the current sales force.

                      So it was the combination of all of these issues that lead
                      to us mutually to decide to do what's best for Cidecin(R)
                      and not to continue to just leave the collaboration
                      hanging and wait for some new data down the road and then
                      try to reengage Gilead.

                      We felt it was more appropriate to move forward and
                      develop the compound - develop the regulatory package
                      ourselves, get it filed and determine the best
                      commercialization strategy with a partner who is willing
                      to commit to that process.

Tom Dietz:            And you have participated or members of your team in
                      meetings with regulatory authorities in Europe?

Scott Rocklage:       We participated in the co-meetings with Gilead in both
                      France and Sweden and have held our own meetings with the
                      UK authorities.

Tom Dietz:            Okay, so in regards to complicated skin and soft tissue,
                      can we break on to that and talk about why you think a
                      single indication is supported by the FDA? How did they
                      communicate that to you and is there any single indication
                      anti-infective precedent approvals that you can point to,
                      and I guess as part of that, is there anywhere that
                      Cubist's NDA filing and registration strategy varies from
                      a standard for anti-infectives?




Scott Rocklage:       Well, let me deal with that one first perhaps in that, as
                      you know, all antibiotic trials are based upon proving
                      non-inferiority. That is a statistical goal that's
                      mandated by the FDA but that has certain statistical
                      requirements associated with that.

                      The FDA has changed some of those statistical requirements
                      over time, actually even in the course of a particular
                      development programs and more recently they've become more
                      flexible with some of those statistical requirements.

                      So our plan is for the development of this drug is in
                      concert with what the FDA requires for antibiotic trials.
                      There's nothing that significantly differs from what you
                      consider to be the standard in this area.

                      Have any other products been approved on one indication?
                      The most recent example of that would be Cancidas, the
                      anti-fungal from Merck that's an IV delivered drug that
                      was approved a little over a year, year and a half ago for
                      refractor aspergillosis.

                      And so that was an example of that, and if you go back to
                      the original Zithromax approval for Pfizer, that was also
                      based upon respiratory tract only and expanded over time.

                      So there's been a couple of examples, one historical and
                      one quite recent.

                      In terms of what's going into the NDA package, there will
                      be over 1200 patients included in the safety database.
                      They'll be Phase I special population studies that we've
                      spoken of in the past that range in everything from
                      studying how Cidecin(R) may or may not interact with other
                      drugs, how does




                      Cidecin(R) perform in an arena of compromise renal hepatic
                      function, how does Cidecin(R) perform when patients are
                      elderly or when they're obese and others, as well as Phase
                      II supportive studies and the Phase II bacteremia study.
                      The Phase III pivotal trials for efficacy and complicated
                      skin and soft tissue as well as the classical microbiology
                      manufacturing and risk benefit analysis sections.

                      So that's the primary content of the NDA. We're on track
                      for an end of year 2002 filing and do not foresee any
                      changes to that plan at this current time.

Tom Dietz:            And two points, the first part of that question was how
                      did the FDA communicate to you regarding the support for
                      the filing?

Scott Rocklage:       At the time that we ended up going back to the FDA after
                      community-acquired pneumonia results when we followed up
                      with them, we asked the question--was the safety database
                      of enough dimension to allow for the evaluation of safety
                      and what's the feeling from the agency regarding filing on
                      complicated soft tissue with the supported data that I
                      just outlined.

                      The feedback from the agency both in terms of verbal
                      feedback and written feedback was affirmative that the
                      safety database was going to be of a dimension to allow
                      for the evaluation of safety and the risk benefit analysis
                      appeared to be in balance to evaluate the efficacy of the
                      drug around complicated skin and soft tissue combined with
                      the supportive studies that I just mentioned.

Tom Dietz:            Okay great. A third area that's really been brought up
                      here is as it relates to Cubist's balance sheet, you know,
                      our model for Cubist has you ending fiscal year '02 with
                      approximately $150 million in cash and we're anticipating
                      that the fiscal year '03 burn rate's going to increase due
                      to launch costs for Cidecin(R) and a lack of Gilead
                      milestones.




                      There's an argument being made that Cubist may be in a
                      position of either gaining approval for Cidecin(R) in late
                      '03 but lacking the cash resources for launch or on the
                      other hand Cidecin(R) not gaining immediate regulatory
                      approval and the Company lacking resources to move the
                      pipeline forward.

                      Can you walk us through whether the Company has - what
                      your plans are to address those concerns?

Scott Rocklage:       Yes we will. Our current burn is approximately $20 million
                      per quarter in 2002 and our end of year cash projections
                      is approximately $150 million. We are currently building a
                      2003 operating plan that would yield north of $75 million
                      to $80 million on the balance sheet at the end of year
                      2003.

                      This plan would include a Cubist's led launch of
                      Cidecin(R) in the U.S. as is the strategy for the launch
                      of the drug, potential partnerships for Cidecin(R) in
                      Europe and Asia and possible expansion or addition of
                      research fields like the deal with Novartis.

                      We have enough cash to launch Cidecin(R) and our operating
                      plan does not require any additional financings until
                      after the Cidecin(R) U.S. launch.

Tom Dietz:            And does that include moving the additional programs in
                      the pipeline like your CAB-175 forward?

Scott Rocklage:       That includes moving both pipeline preclinical, late
                      preclinical, early clinical programs forward throughout
                      2003 as well, both OCTX as well as CAB-175 will be fully
                      funded under the plan I just outlined to you.

Tom Dietz:            Great.




Scott Rocklage:       As far as other issues associated with the financial
                      structure of the Company, the debt structure is a
                      convertible debt that's based upon $39 million note due in
                      2005 and $165 million convert due in October 2008.

Tom Dietz:            Great Paul can you open up the call to questions?

Operator:             Yes sir at this time I would like to remind everyone in
                      order to ask a question please press star then the number
                      1 on your telephone key pad. One moment please for your
                      first question.

                      There are no questions at this time Dr. Dietz.

Tom Dietz:            Okay Scott I have a few more questions here. Can you walk
                      us through the market research that you did that indicated
                      that formulary committee members and physicians did not
                      view a single indication label as a deterrent to putting
                      Cidecin(R) on formulary or using the drug in clinical
                      practice.

Scott Rocklage:       Yes we'd be happy to do that and I'm going to ask Mike
                      Bonney who coordinated those efforts to speak to that
                      issue.

Michael Bonney:       Hi Tom its Mike. We went out soon after the results of the
                      first community-acquired pneumonia trial were in and spoke
                      with a group of both infectious disease specialists as
                      well as PharmDs who have formulary committee
                      responsibility and put to them the profile of the drug
                      based on the filing data that Scott's already articulated
                      and asked them what their reaction would be from a
                      formulary standpoint.

                      We also tested other profiles that included a profile with
                      the community-acquired pneumonia etcetera and what we
                      found was that there was very little




                      change in their perspective in terms of which formularies
                      this product would go on or how it would be reserved on
                      the formulary, if at all, based on this negative CAP
                      result.

                      The user community clearly communicated that they did not
                      see this as a drug for community-acquired pneumonia but
                      rather a drug for serious Gram-positive infections in the
                      hospital.

                      So with the combination of that information plus the
                      feedback from the agency that Scott's already articulated
                      we put our heads down on the task of assembling the NDA
                      and getting it ready for filing by the end of this year.

Tom Dietz:            Maybe you can take off from that comment and tell us a
                      little bit about what you think the product labeling might
                      read for here and what kinds of information might either,
                      you know, increase or decrease in the medium market
                      opportunity for Cidecin(R).

Michael Bonney:       The label will be for complicated skin and skin structure
                      infections with a host of Gram-positive organisms--primary
                      among them are both methicillin sensitive and methicillin
                      resistant staph plus a number of strep species that also
                      cause serious skin and soft tissue infection.

                      What we're really going to be focusing on from a launch
                      standpoint is that will be consistent with the label is
                      focusing this drug as a staph drug to replace vancomycin.

                      As you know vancomycin is the staph drug that is used now
                      in almost 2 million patients a year in the U.S. and this
                      label will line up very nicely against vancomycin in the
                      treatment of staph infections.




                      Remember as well that this label that we're applying for
                      at the end of this year is not the end of the development
                      of the label for this drug. We have an on-going trial
                      looking at patients with both endocarditis and bacteremia,
                      as well as an ongoing trial looking at head-to-head with
                      linezolid looking at patients with vancomycin-resistant
                      enterococci.

                      As these trials come to completion and are successful we
                      will be supplementing the label with indications in
                      endocarditis as well as VRE.

Tom Dietz:            Sure considering that Cidecin's(R) price point is likely
                      to be significantly higher than vancomycin, what do you
                      think will be the key selling points in order to convince
                      physicians to move from vanco to Cidecin(R)?

Michael Bonney:       Well I think the first thing you have to understand Tom is
                      that there is not great satisfaction with vancomycin in
                      the marketplace today. It is used because it is the most
                      effective agent physicians have to treat in particular
                      MRSA but its performance is not great.

                      So I think that, you know, it has become a habit for house
                      staff to cover MRSA empirically but again the performance
                      is not great for this drug and that comes back loud and
                      clear every time you talk to physicians.

                      I think the key selling message is for Cidecin(R) versus
                      vancomycin are very simple. Cidecin(R) is a cidal drug
                      that is safe to use in the treatment of staph infection.
                      It also provides convenience for the staff in the hospital
                      because it is dosed only once a day.

Scott Rocklage:       And a follow on to that would be related to your question
                      regarding price. Clearly at the end of the day we haven't
                      set price for this drug at this point in time but it will
                      be higher than vancomycin. We can commit to that.




                      And what we know about the performance of Cidecin(R) to
                      date is that we have some time based messages that
                      currently are being investigated to see whether they can
                      be tuned into pharmacoeconomic story.

                      We have been able to demonstrate that we have a shorter
                      time to cure and also a shorter time to reduce patients'
                      elevated temperatures to normal than comparative drugs in
                      our trials.

                      This information could easily translate into
                      pharmacoeconomic advantages and we're in the process of
                      pulling that data together so that there's strong support
                      for the drug price itself being more expensive let's say
                      than vancomycin, but still at the end of the day you're
                      reducing morbidity/mortality in these patients and costs
                      associated with their care.

                      So actually by paying more for daptomycin one can see a
                      story developing where you actually save money in the
                      hospital setting along the way. That is the goal and we
                      think we can get to that goal.

Tom Dietz:            Do you think there's any inhibition from - that might be
                      caused by the CAP results and other companies that are
                      saying that you'll have difficulty either in the approval
                      process or on the market because of the CAP trials data?

Scott Rocklage:       Well we think that feedback from regulatory authorities
                      and ultimate users of the drug probably has more value in
                      terms of those kinds of questions than what competitors
                      might say.

                      And when we talk to regulatory authorities as we've
                      outlined here we've found nothing to date but embracement
                      for continuing on with this process of




                      filing the NDA because they feel like this drug is needed
                      in the marketplace from a purely regulatory perspective.

                      On a market perspective in addition to the work that Mike
                      outlined and we performed in the spring of this year, we
                      continue to do significant market research in this area,
                      not talking to ten physicians but talking to significant
                      numbers of physicians to really get a sense of what is the
                      level of excitement about including this drug in
                      (unintelligible) with physician's treating this serious
                      life threatening disease.

                      We present to those physicians in this market research
                      study the product profile that's going to be based upon
                      the package label. What we find is incredible embracement
                      of the product based upon that profile combining the data
                      that's provided clinically, the microbiology spectrum and
                      the safety that we've been able to demonstrate to date.

                      So when we talk to our true audience that is regulatory
                      authorities first and then ultimate consumers of the drug,
                      we find that we have incredible support to move forward
                      with alacrity on getting this drug to the marketplace and
                      that's the Company's plan.

Tom Dietz:            Okay the Company indicated that the preclinical package
                      for Cidecin(R) was complete somewhere around the middle of
                      2000 and data from the second skin and soft tissue study
                      was completed I believe in October of last year.

                      Can you give us some sense of what's been going on since
                      then and also some - just give us some sense of where you
                      are in terms of the manufacturing of the product.




Scott Rocklage:       Sure the completion of our announcement of the results
                      from the second complicated skin and soft tissue study
                      last year only begins the process of completing the
                      analysis and writing the formal what's called Clinical
                      Study Reports.

                      In addition to that we were completing the analysis of the
                      two CAP trials. Those final Clinical Study Reports weren't
                      completed until late July this year. Contemporaneously
                      with those activities we were completing the Phase I
                      special populations' studies I mentioned earlier as well
                      as the reports associated therewith, the Phase II reports.

                      And then compiling these reports into integrated summaries
                      of safety and integrated summaries of efficacy as required
                      for a formal NDA. Those are the activities that have been
                      going on for the last few months.

                      With regarding manufacturing - activities on manufacturing
                      have been in the role of validating the manufacturing
                      process and that's the CMC section that it obviously is
                      critical to the ultimate approval of the drug.

                      So we're still on track for the fourth quarter filing
                      based upon all of those activities being managed
                      aggressively and the whole NDA team being focused on
                      making that happen.

Tom Dietz:            Terrific. You have a compassionate use program for the
                      drug as well. Can you tell us who's been requesting drug,
                      for what indications and how have things worked out for
                      these patients?

Scott Rocklage:       Well this emergency use program that we've had to date is
                      a non-advertised, non-marketed program that basically
                      comes about as a consequence of physicians that know about
                      the potential performance of daptomycin and then




                      make requests to us for certain kinds of patients that
                      they feel dapto might be appropriate for.

                      We've received roughly 30 to 40 calls from physicians
                      under this "emergency use" access.

                      Most of those have come in the form of linezolid or
                      Zyvox-resistant VREs, some small number of
                      linezolid-resistant staph as well.

                      We've provided Cidecin(R) to about half of those emergency
                      requests to date and we are currently expanding the
                      program to a more formal treatment use protocol that
                      actually is under review with FDA which would allow us to
                      collect additional data in a more formal manner that will
                      ultimately be used in regulatory filings and publications.

                      We ultimately will consider whether this kind of program
                      makes sense in Europe as well.

Tom Dietz:            Terrific that's the end of the questions that I have. I'm
                      wondering if you'd like to add anything additional that we
                      may not have touched on that you think is important from
                      your perspective regarding Cidecin(R)and U.S. and Europe.

Scott Rocklage:       No Tom I think that we've hit on all the core issues.

Tom Dietz:            Great well first of all thank you to the management team.
                      Thank you for all the conference call participants. Feel
                      free to follow up with either the company or myself and
                      you can contact me directly or through one of your sales
                      reps.

                      Again thank you very much for everyone's participation
                      this morning.




Operator:             Thank you all for participating. This concludes today's
                      conference call, you may now disconnect.


                                       END