� 2000, Biotechclinician



CELL PATHWAYS UPDATES

January 24, 2000

Hello everyone, it looks like we are awful close to a decision by the FDA on Aptosyn (exisulind). For those of you who don't know, on January 11, 2000 the FDA advised Cell Pathways that it plans to evaluate the New Drug Application (NDA) for Aptosyn without requiring input from its Oncologic Drugs Advisory Committee (ODAC). This is a promising development (as you can see from the price of the stock) that suggests that the FDA has all the information needed to render a decision on approval/disapproval of Aptosyn.

A number of factors would seem to be pointing to the approval of Aptosyn (hopefully the first of many for CLPA!). It seems the FDA would be unlikely to forgo an ODAC meeting for a drug they were not going to approve. I believe the FDA would be hard pressed to deny approval of an extremely safe (and efficacious) drug without the input (and questioning) of an expert panel.

Another factor seems to be the approval of Celebrex as an "oral adjunct to usual care (endoscopic surveillance and surgery) for patients with familial adenomatous polyposis." The approval was based on "a six-month, 83-patient clinical trial, sponsored by the National Cancer Institute's Division of Cancer Prevention in collaboration with Searle." According to the company it was "the largest randomized, double-blind, placebo-controlled trial to date in FAP. The clinical study demonstrated that an oral dose of Celebrex 400 mg twice a day significantly reduced the number of adenomatous colorectal polyps by an average of 28 percent -- compared to a 5 percent reduction with placebo." Certainly the approval is great news for FAP patients but , the results from Aptosyn only look that much more impressive in comparison.

A final factor that seems to be in our favor is a statement about the Celebrex ODAC meeting by Robert J. Towarnicki. He stated that "several circumstances have led to this decision by the FDA. One is that FAP is a chronic, Orphan indication that has no approved medical treatment for the prevention of precancerous polyps." He also stated the fact that "at its December 1999 meeting, which focused on another agent for the regression of existing rectal polyps, ODAC addressed issues concerning the medical management of FAP and the Accelerated Approval process as it relates to that disease."

What does this all mean? It seems there are strong suggestions that we have imminent approval of Aptosyn in the near future. With that said, we can't forget the other possibilities (especially where the FDA is involved). It is certainly possible the FDA has decided not to approve the drug. This seems unlikely based on the study results we have seen as well as the need for therapeutic options in this disease. The other possibility is the FDA requests more studies be done. Either of these outcomes would destroy the stock (remember what happened less than a year ago!). Obviously, we believe the stock will be approved and used (not only for FAP, but also for a number of other diseases). We continue to be holders of the stock. REMEMBER, Cell Pathways is worth ALL or NOTHING, there is very little in between.

On a personal note, thanks for all of the emails, I really appreciate them. For everyone who has been an investor in Cell Pathways' short public life and especially those with the company for years, it looks like your faith and persistence have paid off. This drug will make unfathomable differences in so many lives. Hopefully, we can say we have "done well by doing good."




Well, Cell Pathways came through with flying colors!!!! As everyone now knows, the company managed to pull the phase III trials from the fire. It turned out that of the 65 patients who completed the study, only 34 met the study criteria of forming 10 to 40 polyps a year. The fact that management was able to get the FDA (and the Orphan Drug Office) to give their (implicit) blessing to an NDA filing for APC is quite impressive. Obviously the results supported a filing, but the company was able to convince the FDA that the study was still valid despite the exclusion of a number of patients. As you know, the manipulation of data after the fact is not commonly allowed by the FDA. Once the NDA is filed, the FDA has a finite period of time to approve or disapprove the drug. Despite the promising turn the APC trial has taken, there is no guarantee the FDA will go on to approve the drug.

The company announced the results June 15, 1999. The following day, the company held a conference call to discuss the results and answer analyst questions. The participants for the company (as usual) were Robert Towarnicki, Chief Executive Officer and Rifat Pamukcu, M.D., chief scientific officer. As we have come to expect, the company read a safe harbor statement prior to giving any information. Mr. T began by stating that they were there with the "good news we announced yesterday." The company had met with the FDA about the Phase III APC study results. In the meeting, the company and the FDA reviewed the analysis and had "productive" discussions about the evidence of efficacy.

Dr. Pamukcu then began a discussion of the results of the APC study. The trial initially enrolled 73 APC patients, 65 of who completed the study. The study was designed to compare dug and placebo. The company had limited the study participants to patients who formed 10-40 polyps per year. The 10-40 limitation was set up to achieve a "statistically significant or statistically meaningful" endpoint in an orphan drug population. Without this limitation in place, they would have been forced to look at a study population in the 100s. This becomes difficult in a disease with such a small population base (25,000 to 50,000 in the U.S. depending on whom you read). Of the 65 patients who finished the study, only 34 (15 on drug, 19 on placebo) met the 10-40 former criteria. Upon initial breaking of the blind in February, the study did not seem to be statistically significant because almost half of the patients did not fit the study parameters. Once a detailed analysis was done, the target group was shown to meet the endpoints the FDA agreed on prior to the initiation of the trial. These endpoints were greater than 50% reduction and a p value less than 0.05.

How did the 31 patients who were dropped from the study get included to begin with? It turns out that variability of polyp formation shown in the study was much greater than thought by the experts in this disease. This is not terribly surprising given the rarity of this disease. Because of the lack of understanding of the underlying pathophysiology of the disease (by everyone, including the experts) these patients were referred into the trial without fitting the required criteria. The company was forced to go through these patients entire medical records (from a number of countries, including translations) and figure out their true rate of polyp formation. Once this was done it was much easier to segregate the patients into the correct groups. After the inappropriate patients were removed, the results became statistically significant and met the desired endpoints.

Once the statistical analysis was done, the company the met with the FDA and the Orphan Drug Office. The results were presented along with information from some of the other ongoing APC trials. The FDA and CLPA agreed to proceed with an NDA for the APC indication. The NDA would continue under fast track status (the FDA has 6 months from filing to give a response). The parties agreed on further information being submitted in the fourth quarter from the other ongoing studies. This extra submission can extend the fast track period to nine months. The meeting had two possible outcomes; start a new Phase III study or file an NDA. It looks like we got the better end of the deal. An interesting note from the study was the fact that the physician running the Phase I/II continuation studies at the Cleveland Clinic testified before the FDA. These 12 patients have been on the study for at least three years. She testified that all of these patients are POLYP FREE. It sounds as if this information had a hand in the FDA's decision to allow an NDA filing. There are NO PLANS for any additional Phase III trials in this indication.

Mr. Towarnicki then spoke about the NDA itself. He stated the company is almost back on their timetable they set in November 1998. At that time they expected to file at the end of June. He did not think the filing would be that quick but did expect one this summer. The FDA will then have nine months to review the filing and make a decision.

The conference was then open to questions from participants. I will hit the high points as well as any other areas of interest that came to light.
-The prostate study was raised a few times. The company expects the study to end in late September. The results should be available in late October or early November. They plan to discuss with the FDA what will be needed for approval of the drug for a prostate indication.
-They discussed the number of patients treated. Once the data from the additional APC studies is brought in, it will add close to 80 treated patients to the Phase III data. This would be more than other approved orphan drugs had in their cohorts. Because of the other, ongoing indications. CLPA has plenty of safety data. The side effects have been minimal. There was a mild elevation of LFTs at doses above the therapeutic levels. These resolved upon dosage decrease.
-The patients who were receiving placebo in Phase III are now in a crossover study. This eradicates the need for large populations to study, essentially they are their own controls. The rate of polyp formation (high or low) is now understood in each of these patients. This allows a look at drug effect in all groups.
-They discussed Wall Street. The company will now be able to actively court The Street and get out to tell their "story." The company will have to raise additional funds in the future. The will be "opportunistic" about this. A number of possibilities are being looked at including equity financing or even partnering. They are currently speaking to three large, multinational pharmaceutical firms. They have $30 million in cash with a $20 million/year burn rate.
-In the APC study, despite the exclusion of a significant number of patients, the study maintained randomization. This was very important when presenting the data to the FDA.
-In patients who formed anywhere from nine to infinite polyps, there was a statistically significant reduction. This group did not meet the greater than 50% reduction endpoint. They did see 48% reduction. I feel this is quite significant given the study was not powered for this group.
-Let me mention it one more time. The twelve patients from the Phase I/II study are
POLYP FREE at this time. They have been on drug from 36-45 months. This is astounding given the natural history of the disease.
-They discussed what was occurring in the lab. Exisulind has worked in 40-50 tumor cell lines including the solid tumors, lymphoma, leukemia and gliomas. They have yet to find a tumor cell line that does not undergo apoptosis. They have been trying to develop a resistant colon cancer cell line without any success. In animal studies they have seen colon, lung, breast and bladder cancer prevention. They have seen significant synergy in breast cancer and lung cancer with cisplatin and taxol. They also mentioned the much more potent drugs they have following.
-The FDA allowing pediatric studies speaks to the safety of the drug.
-The drug has NO EFFECT on normal tissue.
-They feel that things are "going very well."

The results of this trial sound incredibly encouraging. In addition, it seems we have a drug that has worked in two distinct tumor types in patients. This goes a long way in buttressing the theoretical mechanism of action of the SAANDs. This is certainly wonderful news for everyone. First and foremost are the patients out there with this devastating disease. This is a God send. Less worry about cancer, the possibility of not getting a colectomy, fewer colonoscopies in the future. If the mechanism of action holds for other types of cancer, the good Cell Pathways has done is immeasurable. We have then seen the start of something that could touch millions. The news, I'm sure, is especially heartening to the researchers and employees at CLPA who have devoted years of their professional lives to this goal. Last (and less important) are the shareholders, certainly a good example of the capital markets helping people "do well by doing good." It seems our risk has gone down while our possible reward went up. How about that!




Cell Pathways is starting two additional Phase II clinical studies of exisulind in prostate cancer. The first is a 12-month, open-label evaluation of exisulind in 15 post-prostatectomy patients who are receiving LHRH-agonist hormone therapy and whose PSA levels are rising. The patients' PSA levels will be checked at monthly intervals and they will be followed for disease progression or the appearance of metastatic lesions by different studies. The second study is an open-label evaluation of the effect exisulind has on the rate of apoptosis and the expression of cyclic GMP-PDE in pre-malignant and malignant prostate tissue compared to normal prostate tissue. The study will enroll 20 men who have histologically confirmed prostate cancer and are scheduled for a radical prostatectomy within two to eight weeks of diagnosis. Participants in the study will receive 500 mg exisulind for periods of two, four, six or eight weeks prior to surgery. The resected prostate tissue will be evaluated for apoptosis rates in premalignant, malignant and normal cells. They will also measure the amount and expression of cyclic GMP-PDE.

It seems like CLPA's management is quite excited about the recent interim results of the prostate study. The results certainly looked promising from the outside. I wonder if it looks even more promising as the number of patients finishing the study increases and the statistics are delved into. The first study is against a tumor type that is quite resistant to treatment. For the company to attack only this tumor type shows significant confidence in the underlying mechanism of action. If this study shows efficacy, you would have a good argument for bypassing LHRH-agonist hormone therapy (a treatment with significant side effects) completely in favor of a treatment with minimal side effects. The second study will be interesting from a purely scientific standpoint. If exisulind works as it is theorized, this study could go a long way in validating that mechanism of action. I continue to believe CLPA is probably the company with the highest possible risk as well as the highest possible reward in our portfolo.




Cell Pathways had a number of promising announcements at the ASCO meeting. CLPA announced results showing synergy between exisulind and chemopreventive/chemotherapeutic drugs. In studies, exisulind demonstrated synergistic activity with chemopreventive and conventional therapeutic agents against lung cancer in both cell culture models and mice bearing human tumors. Exisulind alone inhibited the growth of small cell and non-small cell lung cancer cell lines by 50%. Exisulind in combination chemopreventive agents such as cis-retinoic acid or nordihydrogualarctic acid (NDGA) or chemotherapeutic agents such as cisplatin or paclitaxel (taxol), the researchers observed strong synergistic activity between exisulind and the other agents at concentrations that were subtherapeutic for each drug alone. Researchers also showed that dietary exisulind alone reduced tumor growth in mice bearing human lung cancers by 30%. When the mice received both dietary exisulind and injections of cisplatin, the combined treatment significantly increased the inhibitory effects on tumor growth to 60 - 85%. The cisplatin injections alone had no significant effect on tumor growth. The induction of apoptosis through different mechanisms seems to have an additive effect. The interesting thing is this would allow lower doses of chemotherapy to be as effective as the standard dose. This would decrease the side effect profile significantly thus improving the quality of life for patients. This could also allow increased "cure" rates at the standard dose of chemotherapy. Both possibilities obviously exciting.

Cell Pathways also made two additional announcements at the ASCO meeting. A study demonstrated the ability of exisulind and several other selective apoptotic anti-neoplastic drugs (SAANDs) to induce apoptosis in leukemia and myeloma cell lines. This expands the potential patient base for this class of drugs even further. And finally, researchers published results from a preclinical study that further shows the ability of exisulind and an additional Cell Pathway's SAAND, CP248, to trigger apoptosis in both androgen-sensitive and androgen-insensitive prostate cancer cells.

Although all of these announcements were preclinical in nature, it just goes to strengthen the company's case for the SAANDs and their apoptotic abilities. If you have some comfort that this class of drugs (and their underlying mechanism of action) work then it is easier to place a value on the company solely based on "intellectual property." I do not think it is a question of "if" with this company but instead "when."




WOW! The interim results we have been waiting for are in, and they look good. Cell Pathways announced the interim results of the ongoing Phase II/III prostate study. The study involves the use of exisulind in patients status-post prostatectomy with rising PSA (prostate specific antigen) levels. The results were presented at the annual American Urological Association meeting. The interim results showed PSA levels "in the exisulind-treated group were significantly reduced as compared with the PSA levels of the placebo-treated group." After prostate removal, any PSA levels are suggestive of metastaic prostate cancer. Following is a summary of the conference call.

The company held a conference call on May 6, 1999 to discuss the interim results. The representatives from Cell Pathways were Robert Towarnicki, Chief Executive Officer and Rifat Pamukcu, M.D., chief scientific officer. The conference began with the reading of a Safe Harbor statement by Mr. Towarnicki. This is certainly suggestive of the lengths the company has been forced to go to protect itself from lawsuits. Dr. Pamukcu then went on to discuss the data from the prostate study. The lead investigator is Carl A. Olsson, M.D. of the Columbia University Cancer Center. The study involved 96 patients, it was prospectively designed to include an interim look without breaking the code. The patient population was made up of patients post prostatectomy, with no detectable metastatic disease who have had no hormonal treatments. The patients each had a steady rise in PSA the four months prior to entering the study. The patients were evenly divided into a group receiving exisulind 250 BID or a placebo group. The last patient was enrolled in the trial in September, 1998. Between 50 to 66 percent of the patients have already finished 9 months in the trial with 12 having completed the trial. There were "statistically significant" trends in "all" patients. The PSA levels were 1.6 to 2.1 times higher in the placebo group compared to the exisulind group with a p value of 0.0002 to 0.0053. The change from the PSA baseline was 2 to 3.5 times higher in the placebo group with a p value of 0.0025 to 0.014. The exisulind effect seems to occur in the first one to two months of treatment after which the PSA rise seems to flatten and remain level for the duration. They stated there was a "marked change in velocity of the PSA" with exisulind. The average PSA leveled off at 2.85 in the treatment group. The average PSA was 4.49 and rising in the placebo group. In the patients who are out to 9 months the difference seems to be more significant BUT, it is difficult to draw conclusions from this because the farther you look out, the number of patients dwindle. Of the 96 patients who began the study, 26 have dropped out. The patients seem to have left because of rising PSAs. The physicians and the patients were allowed to make clinical decisions about staying in the study. If they decided that they were not willing to stay with the treatment and wished to move to a different therapy, they were allowed to. The results of the patients who dropped out are factored into the statistics. Dr. Pamukcu did state that no drug has been approved on the basis of PSA levels alone and he does not expect to see that happen in the near future. He stated they would be in discussions with the FDA on what further studies need to be done for approval. He stated they would need a disease endpoint. Though the current study was not designed specifically for a disease endpoint they are capturing the data. All of the patients in the study will get CT scans as well as bone scans on a regular basis. All patients in this study would be allowed to go into an extension study in which they all get the drug.

The company also spoke about some of the other trials they are currently in. In discussing the Phase III APC trial results they made a few interesting comments. They stated that they continue to analyze the results. They expect to make an announcement within the next two months. A question was asked about the "flaw" in the trial. The company stated that flaw was "not the right terminology."

They discussed the other ongoing trials the company is working on. The company stated they were finalizing the study for the treatment of precancerous colon polyps in sporadic polyp formers. The company announced the following day that they had completed enrollment in the Phase III study of its lead investigational drug exisulind for the treatment of precancerous colon polyps in sporadic polyp formers. They are continuing recruitment for the breast cancer study. This is a difficult study to fill because of the specific subgroup they are looking for. They are recruiting patients who have had breast cancer twice and have been cured twice. The pediatric APC study is ongoing. The study involves polyp regression not polyp formation after polyp removal or colectomy. This trial is designed differently than the previous Phase III APC study. A smaller APC trial will have results available in September of 1999. The six month analysis of the placebo crossover from the finished Phase III APC trial is due in August/September, 1999. The Phase I/II lung cancer study is ongoing. Finally, the company also announced they had begun Phase I trials with CP-461, the companies newest SAAND. The drug is initially being studied in healthy volunteers to evaluate safety.

OK, first things first. THE DRUG WORKS. The company stated this throughout and it looks like they have been, at least, partially vindicated. This study suggests that, at a minimum, the underlying apoptotic pathway the SAANDs induce is important in prostate cancer. It sounds as if exisulind inhibits the rise of PSA within a few months of starting the drug and it stays stable. Now, we have to make a few assumptions at this point. First, we have to assume that a rising PSA, after the prostate is removed, means there is metastasis of the prostate cancer. The next assumption is that halting the rise of the PSA has halted the growth and/or further metastasis of the prostate cancer. If you accept these assumptions (which are certainly reasonable from a clinical standpoint) and the results hold for the duration of the trial, what does this mean for the future of the drug? The most obvious use will be in every man after prostate removal. Since exisulind seems to be without side effects, this would be quite a reasonable option. This would make much more sense than waiting for the PSA to rise (i.e. metastasis). Now to peer out a bit further, if a man were diagnosed with prostate cancer that is still localized would exisulind be an option. There has been a long standing discussion in the medical community about treatment versus watching the tumor. A big part of this has been the side effects associated with the treatments (impotence, incontinence). If a drug with minimal side effects can stop prostate cancer growth or slow the spread, I believe this would be a great option for both the patient and the physician. With widespread use in prostate cancer alone, we are looking at a big market. Once you factor in other diseases as well as newer, more efficacious drugs you can see the possibilities for the future of the company.




February 1, 1999-As everyone knows by now, Cell Pathways announced a delay in filing the NDA for Prevatac. There were inconsistencies with the data from Phase III compared to Phase I/II results. For those of you who have not seen the press release, here it is. Following the press release I have written a summary of the conference call given today.


PRESS RELEASE
Cell Pathways, Inc. (Nasdaq: CLPA) today announced that it anticipates a delay in the filing of its NDA for its novel investigational drug, PREVATACTM (exisulind) for Adenomatous Polyposis Coli (APC), which was initially planned for March of this year. A preliminary evaluation of the unblinded data from the Phase III trial of exisulind for APC suggests that the study did not achieve a statistically significant clinical response when compared to placebo.
"This result comes as a surprise to all of us at Cell Pathways since it appears inconsistent with data from previous Phase I/II and extension studies in this patient population, as well as from studies in animal models and cell culture systems," said Rifat Pamukcu, M.D., chief scientific officer at Cell Pathways. "We are continuing to evaluate the data in an attempt to isolate the causes underlying such a result. This process is expected to continue for some weeks." As previously announced, clinical trials in other precancerous and cancerous conditions continue, and Cell Pathways expects to have interim data in a prostate cancer study in March or April.
"As a result of this preliminary evaluation, Cell Pathways does not expect to make its anticipated NDA filing for APC in March of this year," said Robert Towarnicki, chief executive officer and president at Cell Pathways. "Upon completion of the analysis of the data the company will establish a revised development and commercialization plan for the APC indication."
Cell Pathways is currently conducting pivotal trials of PREVATAC
TM (exisulind) for preventing the recurrence of prostate and breast cancer and for the treatment of sporadic precancerous colon polyps, as well as a pilot study in lung cancer and a Phase II study in Barrett's Esophagus.
Exisulind and other of Cell Pathways compounds, which inhibit a cyclic GMP phosphodiesterase and cell growth, and induce apoptosis (programmed cell death), but do not inhibit COX pathways, are potentially useful for the treatment of precancerous and cancerous lesions. Cell Pathways has identified over 500 additional compounds, in multiple chemical classes, many of which have significantly greater apoptotic activity than PREVATAC
TM (exisulind). The selectivity of these compounds for neoplastic cells is expected to yield agents to treat precancerous and cancerous cells without the toxicities associated with conventional chemotherapeutic agents. The company has an IND for human clinical testing of one additional higher potency compound, CP461, which is targeted for use in cancer indications.


The following is a summary of the conference call given February 1, 1999.

The call began with Robert J. Towarnicki essentially reiterating the press release. He stated when they broke the code on the Prevatac study they were surprised not to achieve "statistical significance." This was totally "inconsistent with all of the data generated in the humans as well as animal models and tissue culture." He further stated that they still believe that the drug has "potential" and they would continue to develop it at a "rapid" pace for precancerous and cancerous lesions. They are currently analyzing the data and can not interpret it at this point. They believe the results are not indicative of Prevatac and its activity. They did feel compelled to rush this information (preliminary as it is) to the investment community. They continue to expect to have the interim prostate results in the March/April time frame.

In the question and answer session the company stated they were aggressively looking at the data. He stated the entire clinical group was involved in this. If they were forced to do another trial for APC, it would be 18 months before it would be done and an NDA was filed. Instead they will be looking to accelerate some of the other clinical trials that are ongoing. They are unsure if they would be able to get any data out of the APC trial. CLPA only broke the code on Saturday and was together with the statistician today. They were planning on reviewing a number of areas of the trial including quality control, the physician evaluation, pharmacokinetics and serum plasma levels. The trial is designed with enough data points they should be able to pull whatever information they need from the results. They expect within one to two months they should have the analysis of the APC trial done. They are looking for what other indication they could use for the initial FDA approval. They stated the "best case scenario" would be an NDA filing by the end of 2000. The data is very "confused" at the moment and they do not wish to cause further confusion. They saw an "unexpected response" to placebo. They saw people improve on placebo as well as drug which was completely unexpected in a disease like this.

In listening to the conference call, the participants were caught completely off guard with the results from the APC trial. You could certainly hear the shock in their voices during the call. I believe the company deserves complete credit for bringing the results to the attention of the investment community so quickly. Certainly this is part and parcel of investing in biotech companies. Obviously, without the question of whether a drug works or not, there would be no reason to carry out the trials. I am still fascinated by the science behind this company. The finding of the cGMP-PDE that occurs only in neoplastic cells is a marvelous target for anyone interested in treating cancer. This holds true whether Prevatac works or not. It is certainly much more difficult to place a valuation on this company at this time but, as we all know, high risk can equal high reward. As we have said before, do your own research before investing in any stocks. Have a nice evening. Keep up the good work on the Raging Bull.




Cell Pathways announced December 29, 1998 the initiation of a Phase II study with Prevatac for the treatment of Barrett's esophagus. The study will be a one year open label study. This is the sixth indication for Prevatac being studied by the company. The other trials currently underway are for adenomatous polyposis coli, the prevention of prostate and breast cancer recurrence and treatment of sporadic precancerous colon polyps and lung cancer. The adenomatous polyposis coli study is a Phase III study scheduled to be finished in January. The drug should be available at the end of 1999.

The company also announced the filing of an Investigational New Drug (IND) application to begin a Phase I human clinical safety study of CP461. CP461 will be studied for the prevention and treatment of cancer. This drug works by causing apoptosis through the inhibition of a cyclic GMP phosphodiesterase (CP461 and Prevatac are the first members of the class of drugs called selective apoptotic anti-neoplastic drugs (SAANDs). This compound is thought to be 100 times more potent than Prevatac in inducing apoptosis in neoplastic cells. In preclinical studies toxicity was reported to be minimal.

The news of another trial for Prevatac and an IND for CP461 is certainly exciting. It further cements their lead in selective apoptotic anti-neoplastic drugs (SAANDs). The number of indications for Prevatac alone is incredible. The amount of revenue generated for these indications alone (or even half the indications) would be huge. In addition they have a compound that is 100x more potent with fewer side effects, well you get the idea. It seems like the market has also begun to understand the importance of these findings, driving the stock price up quickly. I suspect, with continued announcements from the company, the stock price will continue to reflect the promise of Cell Pathways.




On December 11, 1998 Cell Pathways held a conference call. The participants from the company were Robert J. Towarnicki, Chief Executive Officer and Dr. Rifat Pamukcu, Chief Scientific Officer and Senior Vice President of Research and Development as well as co-founder of the Company. CLPA announced the underlying mechanism of action of a new class of drugs that they are studying. This class of drugs (which includes Prevatac and CP-461) works by inhibiting a cyclic GMP (cGMP) phosphodiesterase (PDE) and inducing selective apoptosis. Prevatac is currently in Phase III trials and CP-461 (which has been shown to have 100 times the apoptotic potency of Prevatac) is soon to begin trials (Phase I in the first half of 1999).

The selective apoptotic pathway works via a novel cGMP-PDE that is an enzyme that degrades a secondary messenger (the cGMP). In apoptosis, cGMP increases and activates protein kinase G that decreases cyclic AMP (cAMP) inducing apoptosis. In neoplastic cells the cGMP-PDE is present, which breaks down the cGMP, not allowing the increase needed to induce apoptosis. Prevatac (exisulind) inhibits the cGMP-PDE, allowing apoptosis. The company believes this specific subtype of cGMP-PDE is present in a number of neoplastic cell lines but not normal cells.

The company is attempting to clone this gene. They are looking at all of the neoplastic cell lines that have responded to the drug and attempting to clone the specific gene in each line. According to the speakers this PDE has "remarkably" different functionality from other similar PDEs. The drugs that they are working on are very specific for this specific subtype; it does not seem to hit the other PDEs. They also mentioned that inhibitors to the other PDEs do not seem to induce apoptosis.

The company expects to finish Phase III trials for Prevatac (exisulind) in January 1999. This drug is in Orphan drug classification with fast track status from the FDA. The NDA has already been partially submitted to the FDA. They have already submitted the chemistry and manufacturing data and will have the pharmacology and toxicology studies by the end of the trials. Once the NDA is submitted (hopefully in late March) the FDA has 60 days to accept it. After that they have 180 days to turn it. This puts initial approval and commercialization into fourth quarter 1999.

They also mentioned that interim results from the prostate cancer trial will be out in March 1999. They plan to present these at the American Urologic Association meeting in April. This study is evaluating the ability of Prevatac (exisulind) to arrest development of metastatic prostate cancer in men s/p prostatectomy with rising PSAs. They stated that the market for chemical castration drugs in this group of patients is over $1 billion, obviously a significant market.

There is an ongoing trial in patients with lung cancer. In pre-clinical studies Prevatac (exisulind) in combination with Cisplatin prevented 85% of lung tumors. They are in the process of recruiting patients for a Phase II/III trial in the prevention of recurrent breast cancer.

The company also made some other interesting points. They expect the patent to be published any day in the U.S. and in the next 6 months in Europe. This will give the company 20 year patent protection from mid-1997 (U.S. filing). They reiterated the number of shares outstanding was 24.2 million (26.2 million with all warrants exercised). It seems like some of the more confused shorts have been stating there are 60 million shares. The company also expects the first analyst report to be published within a month. They mentioned there are four analysts following the company. The company also stated they would have no problem meeting a large demand. They already have an agreement with Zambon (sp.) in Italy to manufacture multi-ton quantities. They company has already started building an inventory of this drug.




Cell Pathways announced that on December 3, 1998 its Board of Directors adopted a Stockholder Rights Plan. According to that plan, rights will be distributed as a dividend at the rate of one Right for each share of common stock, par value $.01 per share, of the Company held by stockholders of record as of the close of business on December 15, 1998. According to the company, The Rights Plan is designed to deter coercive takeover tactics including the accumulation of shares in the open market or through private transactions and to prevent an acquirer from gaining control of the Company without offering a fair and adequate price to all of the Company's stockholders. The Rights will expire on December 14, 2008. Each Right initially will entitle stockholders to buy one unit of a share of a series of preferred stock for $90. The Rights generally will be exercisable only if a person or group acquires beneficial ownership of 15% or more of the Company's common stock or commences a tender or exchange offer upon consummation of which such person or group would beneficially own 15% or more of the Company's common stock.



Cell pathways presented at a conference put on by BankBoston Robertson Stephens on November 30, 1998. The information was posted on a message board so, read it with that in mind.

Long term safety data goes out to 39 months in some patients, over 300 patients have been taking the medication for 6 months. In the companies press releases there have not been significant long-term safety concerns. The FDA set 50% polyp reduction as the minimal outcome, in early trials CLPA with Prevatac surpassed this. The National Cancer Institute is negotiating to fund two more studies. Trials are scheduled to start in two other indications, Barrett's esophagus and bronchial dysplasia. They had better hurry!!!
The assumption is that polyps will recur if the medication is withdrawn.

CLPA has a compound #461 developed as a chemotherapeutic agent. Animal studies show it to be much safer than Prevatac. In animal studies there seemed to be a synergy with taxol and cisplatin.

Cell Pathways is forming a group of smaller distributor companies in Europe. They hope to pay them distributor margins instead of a deal with "Big Pharma."

They also have published data on Prevatac inhibition of lung tumors in animal studies. It is published in Carcinogenesis, Volume 19, Issue 8: August 1998. In this study, a tumor induction protocol, consisting of NNK administration in the drinking water over several weeks to model chronic human exposure, was used to test whether the sulfone (called FGN-1) could inhibit the formation of primary lung tumors in mice. Tumor incidence decreased significantly from 96% in the control diet and 93% in the 250 FGN-1 mg/kg diet to 63 and 67% in the 500 and 750 mg FGN-1/kg diet groups, respectively. Lung tumor multiplicity decreased from 18.1 ± 3 tumors/mouse to 12.3 ± 3 (250), 5.3 ± 1 (500) and 2.1 ± 1 (750). This dose-dependent reduction in tumor formation by a non-toxic dose of FGN-1 indicates a strong chemopreventive activity against experimental induction of lung carcinogenesis.




November 11, 1998--Cell Pathways, Inc. today reported financial results for the third quarter and nine months ended September 30, 1998.

                         
                          CELL PATHWAYS, INC.
                 CONDENSED CONSOLIDATED BALANCE SHEETS
                            (In thousands)
                             (Unaudited)


                                    Pro Forma
                                     Sept. 30,    Sept. 30,   Dec. 31,
                                       1998         1998        1997
                                           
ASSETS

CURRENT ASSETS:
    Cash and cash equivalents        $  41,909  $   14,382     $ 8,461  
     Other current assets                  600         417         179
               Total current assets     42,509      14,799       8,640

OTHER NON CURRENT ASSETS                 2,254       2,587       2,340

                                     $  44,763  $   17,386   $  10,980


LIABILITIES AND STOCKHOLDERS'
 EQUITY (DEFICIT)

CURRENT LIABILITIES:                $    3,883  $    2,250   $   3,257
                                                     
LONG-TERM LIABILITIES:                     146         146           9

REDEEMABLE PREFERRED STOCK:                 --       1,092       1,092

STOCKHOLDERS' EQUITY
  Preferred Stock                           --      53,562      32,158
  Common Stock                             242          30          30
  Additional paid-in capital            80,645         459         456
  Stock subscription receivable from
   issuance of Common Stock               (37)        (37)        (37)
  Deficit accumulated during the 
   development stage                  (40,116)    (40,116)    (25,985)

           Total stockholders' equity   40,734      13,898       6,622

                                     $  44,763  $   17,386   $  10,980

                         
                         CELL PATHWAYS, INC.
            CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
            (In thousands, except share and per share data)
                              (Unaudited)

                              Three Months Ended    Nine Months Ended
                                   Sept. 30             Sept. 30

                                  1998       1997      1998      1997

EXPENSES
  Research and development      $ 4,969    $ 2,362 $  11,866    $5,586  
  General and administrative        801        243     2,768       584
  Provision for the redemption of
   the Redeemable Preferred Stock    --      1,017        --     1,017
         
            Total expenses        5,770      3,622    14,634     7,187

INTEREST INCOME                     259        165       503       288

NET LOSS                       $(5,511)   $(3,457) $(14,131)  $(6,899)
                                                                              
Basic and diluted net loss
per common share               $ (1.84)   $ (1.18) $  (4.73)  $ (2.47)
                                                                              
Shares used in computing basic and
diluted net loss per
  common share                2,990,095  2,927,554 2,990,095 2,788,415

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