Thursday, April 25, 2013
Dedicated to Dr. Mohammed Farooqui
This painting is on display at Banner Hospital for the next few months. When it is returned to me, I will give it to Dr. Farooqui as a gift of appreciation.
Wednesday, April 24, 2013
Novel Antibody Directed at Chronic Lymphocytic Leukemia
By Anna
Azvolinsky, PhD1 | April 3, 2013
1Freelance
Science Writer and Cancer Network Contributor.
Researchers
have identified a novel monoclonal antibody directly targeted against a
receptor found in abundance on chronic lymphocytic leukemia (CLL) cells, but
not normal B cells. The humanized antibody can directly kill CLL cells,
according to Thomas Kipps, MD, PhD, professor of medicine and deputy director
for research at the University of California, San Diego Moores Cancer Center,
and colleagues. The results of the study are published
in the online edition of Proceedings of the National Academy of Sciences.
In contrast
to normal B cells, CLL cells express a high level of CD44, a cell-surface
glycoprotein receptor. CD44 is thought to mediate one of the important survival
signals for leukemia cells. CLL cells receive survival signals from its tumor
environment, including cells that are present in the lymph nodes and the bone
marrow of CLL patients. Previous work from Kipps and colleagues has shown that
CLL cells can undergo drug-induced or spontaneous cell death when removed from
a patient and cultured in the laboratory. Because the RG7356 antibody induces
cell death of the CLL cells by binding to CD44, the drug is a potential new
therapy for treatment of at least a subset of CLL patients.
Tuesday, April 9, 2013
Ibrutinib on a Fast Tract for FDA Approval for 17p Deleted Patients
EXTRA! EXTRA!
April 8, 2013 it was
announced that the FDA granted breakthrough therapy designation for ibrutinib
(Janssen and Pharmacyclics) as a monotherapy for patients with CLL/SLL (chronic
lymphocytic leukemia or small lymphocytic lymphoma) with deletion of the short
arm of chromosome 17. This genetic mutation is associated with poor prognosis
and is one of the worst prognostic
factors in patients with CLL. This is what I have.
This is the third
breakthrough designation the FDA granted for ibrutinib an investigational
Bruton’s tyrosine kinase inhibitor. One was as a monotherapy for previously
treated patients with relapsed or refractory mantle cell lymphoma, and the
other was as a monotherapy for patients with Waldenström’s macroglobulinemia.
The breakthrough therapy
designation was created in 2012. It enables the development and review of drugs
shown in preclinical studies to offer potentially substantial improvements over
existing therapies for patients with serious or life-threatening diseases to be
expedited.
Patients like me with 17p
deletion generally do not respond well to chemoimmunotherapy, and are limited
on their treatment options. In my case, because I am bi-racial, I have less
than a 1% chance of finding a bone marrow donor match. Ibrutinib has the
potential to improve the outcome in this serious and life-threatening disease,
and is much less risky than a bone marrow transplant.
A Phase II global study of
ibrutinib in patients with CLL deletion 17p, will be available this year and
Pharmacyclics plans to enroll 111 patients worldwide. The study called
“RESONATE™ -17” is a single-arm, open-label, multi-center trial using ibrutinib
as a monotherapy in previously-treated patients who have deletion 17p, who did
not respond or who relapsed (a high unmet need population). The purpose of the
study will be to determine overall response rate.
Those of you following
my blog know that I have just completed my 9-month milestone as “a little white
laboratory mouse” in the clinical trial with ibrutinib. Dr. Adrian Wiestner,
M.D., PhD, of the National Institutes of Health is the lead investigator in the
clinical study. Dr. Wiestner just presented the findings from this clinical
trial at the American Association for Cancer Research (AACR) in Washington,
D.C. Here is an excerpt from Pharmacyclics’ press release from April 8, 2013.
Please note that this is a fast track to FDA approval, and applies to 17p
deleted CLL/SLL patients like me. :-)
Phase II Ibrutinib
Monotherapy Study Shows CLL Patients Achieved Rapid and Sustainable Disease
Control Irrespective of Age or High Risk Prognostic Factor
SUNNYVALE, Calif., April
8, 2013 /PRNewswire/ -- Pharmacyclics, Inc. (Nasdaq: PCYC) today announced
results from a Phase II trial of the investigational oral agent ibrutinib which
demonstrated rapid and sustained disease control as a monotherapy in untreated,
relapsed and refractory chronic lymphocytic leukemia (CLL) patients,
irrespective of characteristics that predict poor outcomes to
chemoimmunotherapy.
This study was discussed
at today's American Association for Cancer Research (AACR) annual meeting in
Washington, DC together in addition to 8 other presentations covering advances
in clinical and pre-clinical research with ibrutinib. The Phase II study, which
was sponsored by the National Heart, Lung and Blood Institute, included an
analysis of two CLL patient cohorts: the elderly, above 65 years of age, (n=24,
of which 8 were treatment naive) and the high risk genetic group with a
deletion of chromosome 17p (del 17p) (n=29, of which 15 were treatment naive).
Many elderly patients with CLL are unable to tolerate aggressive therapies.
Patients with deletion of chromosome 17p typically are poor responders to
chemoimmunotherapy and have limited treatment options with no standard of care
defined. Of all CLL patients enrolled in this trial, 72% had been characterized
as Rai stage 3-4, indicating an advance stage, high-risk patient population.
The results of the study
were presented by lead investigator Adrian Wiestner, M.D., PhD, Hematology Branch, NHLBI, National
Institutes of Health. "Ibrutinib was highly efficacious as a single agent
in patients with untreated, relapsed and unresponsive CLL, irrespective of
their del 17p status," Dr. Wiestner said. "Responses in this study
appear to be durable, and results indicate the drug is effective against the
disease in lymph nodes, spleen and bone marrow. This is important because
existing therapies often fail to effectively eliminate cancer cells in these
tissue sites. Targeted therapy for CLL is becoming a reality, and this new
approach may greatly improve the lives of patients with this disease."
The study also evaluated
in vivo effects of ibrutinib using blood and tissue samples collected before
and during treatment. Ibrutinib demonstrated rapid and sustained disease
control in blood, lymph nodes, spleen and bone marrow. After 6 months, 95
percent of patients experienced a reduction in lymph node size and all showed
reduction in spleen enlargement, with a median reduction of 55 percent. In 26
patients, for whom a bone marrow biopsy was done, tumor infiltration decreased
by 82 percent.
The Progression Free
Survival probability for these patients at 12 months was estimated to be 94
percent. Most adverse events were mild and manageable and included diarrhea,
fatigue and rash, severe events occurred in less than 13 percent of
patients.
"We are very pleased
with the continued research that is being demonstrated at AACR across 9
different presentations. These advances show the potential breadth of the
ibrutinib program and provide further opportunities for us to pursue. We are
grateful for the continued support of our collaborators, investigators,
patients and shareholders," said Bob Duggan, CEO and chairman of the
board.
Ibrutinib has been
designated as a FDA Breakthrough Therapy in CLL patients with deletion 17p, based on data from completed Phase I/II clinical
studies, where ibrutinib as a monotherapy was used to treat patients with this
disease. Ibrutinib has the potential to improve the outcome in this serious and
life-threatening disease, and may provide a substantial improvement over
existing therapies for this indication.
Saturday, April 6, 2013
The Ibrutinib story
Forbes Magazine
April 5, 2013
The Wild Story Behind A Promising Experimental Cancer Drug
Today, Pharmacyclics is a $5.3B company, a value
attributable largely to its promising lead compound, ibrutinib, currently in
late clinical development for chronic lymphocytic leukemia (CLL) and mantle
cell lymphoma, and under investigation for a range of other B-cell
malignancies. A joint development and marketing deal with J&J was announced in late 2011, valued at nearly $1B,
including $150M upfront plus significant milestone payments. Analysts are already pegging future sales in the billions.
Ibrutinib’s emergence as a promising oncology drug – “The
Gleevec of CLL,” as one oncologist described it to me – is an almost absurdly
improbable story embracing the Human Genome Project on the one hand, and
Scientology on the other.
A “Most Wondrous Map”
In 1998, a radically inventive biologist, J. Craig Venter, founded a company called
Celera, with the goal of sequencing the human genome within three years.
He was competing against a much larger, well-funded public effort, led by Human
Genome Project Director Dr. Francis Collins, who is now Director of the
National Institutes of Health.
Both efforts succeeded; the initial draft map of the human
genome was famously announced on June 26, 2000 by President
Clinton, joined by Venter and Collins. Clinton said, “Today the world is
joining us here in the East Room to celebrate the completion of the first
survey of the entire human genome. Without a doubt, this is the most important,
most wondrous map ever produced by humankind.”
In 2002, Venter stepped down as President of Celera, and over
the next four years, its promise progressively evaporated. Turning
information into value – arguably the key challenge of the genomic era
– proved elusive. The company’s attempts to try its hand at drug
development — kick-started by the acquisition of Axys Pharmaceuticals in 2001 —
had largely fallen short. Electing to focus on diagnostic testing, the
company unloaded its early stage assets – a phase 1 HDAC inhibitor and a few
other preclinical molecules, which in 2006 were picked up for a pittance by a
small struggling company called Pharmacyclics.
A Useful Tool
Included among the preclinical assets were small molecules
targeting a signal transduction molecule called Bruton’s trysosine kinase – BTK
– an enzyme that sits downstream of the B-cell receptor, and was targeted by
Celera because of its putative role in autoimmune diseases such as rheumatoid
arthritis (a thoughtful discussion of “immunokinase” drug discovery can be
found here). The BTK gene itself — tied
through “classical” genetics to the disorder X-linked agammaglobulinemia (XLA) — was first
identified in 1993.
As part of their efforts to screen candidate BTK inhibitors,
Celera researchers created a “tool compound,” a molecule that would bind BTK
permanently (i.e. covalently), and could also be fluorescently labeled.
This tool would help the company identify compounds that could bind BTK
tightly, but not covalently, since drug developers traditionally shy away from
compounds that permanently bind their target, concerned about their “potential
for off-target reactivity,” as a recent review
nicely summarizes. That said, many drugs, both ancient– such as aspirin –
and recent – such as clopidogrel (Plavix) and esomeprazole (Nexium) – work
through a covalent mechanism.
As Celera researchers pursued BTK inhibitors, they made two
important discoveries: first, they learned that their molecules seemed to show
activity in arthritis models; second, they progressively appreciated that their
tool compound seemed more promising than any of the other molecules emerging
from their screens. It was at this point that Celera’s assets were sold
to Pharmacyclics.
Developing Science
Meanwhile, elegant experiments in mice by Harvard immunologist Klaus Rajewsky
highlighted the importance of B-cell receptor signaling for B-cell development,
stimulating cancer researchers to wonder whether inhibiting B-cell receptor
signaling might help treat B-cell cancers. In rapid succession, scientists
from Stanford, Harvard, and other universities reportedly reached out to a
small Bay-area biotechnology company called Rigel
to request permission to study one of their lead compounds, fostamitinib, an
inhibitor of the Syk kinase which is also in the B-cell receptor signal
transduction pathway.
The initial results were promising but not stellar,
although encouraging responses were seen in some patients, according to Dr. Jeff Sharman, who at the time was a
Stanford oncology fellow in the legendary lab of Ronald
Levy, and an early proponent of inhibiting B-cell receptor signaling
in B-cell cancers. (In 2010, Rigel partnered fostamitinib with AstraZeneca, and
it is currently in late-phase development for rheumatoid arthritis).
Sharman (disclosure: we trained together at MGH) recalls that a frequent
visitor to the Levy lab was Dr. Richard Miller, an oncologist and entrepreneur
who at the time was CEO of a local drug development company: Pharmacyclics.
Local Hero
Richard Miller was already a bit of a legend in the Bay area;
in 1984, he co-founded IDEC with Stanford colleague Levy, UCSD immunologist Ivor
Royston, San Diego bioentrepreneur Howard
Birndorf, and a trio of top-tier VC investors led by Brook
Byers of KPCB
(he’s the “B”), and including Tony Evnin of Venrock and Pitch Johnson of Asset Management;
IDEC integrated an existing company, Biotherapy
Systems, that Miller and Levy had founded in Mountain View. In
1997, IDEC delivered rituximab, the first monoclonal antibody approved by the
FDA for cancer treatment; it is also used for the treatment of rheumatoid
arthritis. IDEC merged with Biogen in 2003.
Miller ultimately left IDEC, and in 1991 teamed up with
chemist Jonathan Sessler to co-found Pharmacyclics, a
collaboration that reportedly began when Miller was treating Sessler for
cancer at Stanford in the early 1980’s. The company was initially focused
on a class of molecules called “texaphyrins,” synthesized by Sessler (who had
moved on to the University of Texas); the name may reflect either the UT
origins or the resemblance of the structure to the five-point star of Texas.
While initially promising, the lead molecule, motexafin
gadolinium (Xcytrin), was unfortunately not panning out in clinical studies of
brain metastases (eventually leading to a much-publicized dispute between Miller and the
FDA), prompting Pharmacyclics to start thinking about a Plan B. Enter
Celera.
A Prepared Mind
The opportunity to pick up potentially promising assets from
Celera – essentially, acquire an early-stage pipeline – was appealing to
Pharmacyclics; while the deal apparently was initially focused only on the
Phase 1 HDAC asset, Miller reportedly was keen for the BTK inhibitor program to
be included as well; it was an easy request to grant, as its perceived value at
the time was just about zero.
Additional studies of autoimmune disease seemed to confirm
the potential of the “tool” BTK inhibitor, now designated PCI-32765;
however, Miller was eager to explore its potential in B-cell cancers. The
problem was that it was hard to find appropriate models to use, either cell
lines or animal models, as it was felt essential to find a model in which
growth was explicitly dependent upon B-cell receptor activation, rather than
bypassing it as was more commonly the case in model systems. Ultimately,
the team decided their only option was to study the drug in spontaneously
occurring lymphomas in dogs, and obtained results that were suggestive, but not
overwhelming. A partial response was observed in several animals, stable
disease was seen in several others.
The team struggled with what to do
next. For starters, they had reached the limits of what they felt they
could learn from preclinical studies, and needed to decide, in the words of a
researcher, “whether it was worth $1M” to figure out whether the promising but
shaky preclinical results would translate into patients.
In addition, the team was also
agonizing about whether to move forward with a molecule that worked by forming
an irreversible, covalent bond; perhaps it would make more sense to go back to
the chemistry lab, and try to identify a BTK inhibitor that worked by a more
traditional, non-covalent mechanism.
“I Have Patients Who Are Dying”
Reportedly, Miller asked the team what
were the risks of moving ahead with the covalent mechanism, and when he
received vague responses, he reportedly told his colleagues, “I have patients
in clinic who are dying, and need something right away. I can’t tell them
they’ll need to wait around for another year because we have a concern we can’t
even articulate.”
Hence, the clinical study was
initiated, and while at first it was slow to recruit, it ultimately was
completed and viewed as strikingly successful. The drug – now in phase 3,
and called ibrutinib — is not a magic bullet, but may emerge as a promising
option for some patients with some B-cell cancers.
On The Road Again
In another strange twist, Miller hasn’t
been around to see this; he was dismissed in 2008 by the chairman of the
board, Robert Duggan, who is perhaps best known as Scientology’s biggest donor. While a
Bloomberg report seems to suggest Miller’s departure
reflected Duggan’s disappointment in the Xcytrin program, and his preference
for focusing on B-cell cancers, I’ve also heard a very different account,
suggesting it was Duggan who was keen to pursue Xcytrin, and Miller who
refused, preferring instead to focus on the promising BTK inhibition program.
Miller promptly teamed up with UCSF
chemist Jack Taunton to co-found Principia
Biopharma, a company that focuses on “reversible covalent” molecules
– drugs that form covalent bonds that release when the target protein
denatures; VC backers include New Leaf, OrbiMed, Morgenthaler, SR One, and the UCSF early stage fund Mission Bay
Capital.
In 2010, Miller signed on with the
University of Texas as “Chief Commercialization Officer.” However,
according to reports, this role ended abruptly with his
resignation less than two years later “after UT officials insisted that Miller
divest his ownership interest in three startup companies that intended to
license tech discoveries from the school.” He is said to be working
on a new company focused on a novel drug delivery technology.
Lessons Learned?
1.Limitations of experimental models. In this case, the team had the insight, and the confidence,
to recognize that available model systems for the study of B-cell cancers
wouldn’t accurately enable assessment of their B-cell receptor-dependent
mechanism, and rather than force the molecules through traditional assays (and
get a false negative result), they tried to use a less traditional approach
(e.g. spontaneous lymphoma model in dog), and then proceed rapidly to the
clinic.
2.
Value of a translational champion: This is evident on
both the academic side (e.g. inquisitive physicians such as Sharman) and on the
industry side (e.g. Miller’s ability to see the clinical potential of research
compound developed for different indications).
3.
Courage to value clinical need over
conventional wisdom, and empiricism over theory. Miller
challenged traditional pharmaceutical reticence about covalent mechanisms in
order to speed an important new drug to patients.
4.
It helps to be lucky. For each of the lessons here –
and particularly, for each of the “brave” and “bold” choices — I can easily
envision how following this exact approach might have led to a far less
favorable outcome, and a very different narrative (e.g. “cavalier physician
imperils patients in reckless pursuit of flawed vision”).
Bottom Line: Discovering impactful new drugs is far more difficult – and far less
linear – than is typically recognized. It’s wonderful to celebrate
success; our challenge is finding a way to repeat it.
Thursday, April 4, 2013
9-month milestone on Ibrutinib
My son is
running the Rock ‘n’ Roll San Diego Marathon to raise money for research for
the Leukemia & Lymphoma Society on June 2, 2013. This event funds clinical
trials for leukemia and lymphoma. Please read his story.
I am personally grateful every day that I have had an
opportunity to participate in a clinical trial, and I am grateful every day for
the wonderful people who have funded all the clinical trials through their
donations.
On another note, I just
returned from the National Institutes of Health in Bethesda, Maryland last
night about midnight. It was my 9-month milestone on Ibrutinib. I got the best
blood work report I have had in a long while. My white blood count has gone
down from 53,000 to about 35,000 in the last three months. (approximately 4,000 to 10,000 is
normal). I am where I was shortly after I was diagnosed. Nothing would make me
happier than to become “normalized.” Dr. Farooqui said for me NOT to expect
that I will be within the normal range at my next appointment at the end of
June. But as long as I am headed in the right direction, I am okay with that.
I am
not anemic. My kidney function, LDH, and other organs appear normal. Hemoglobin
and platelets are stable. Absolute lymphocytes are coming down. Nutriphils are
normal now (They were not last time). Bone marrow does not show anything
suspicious.
I am
off Acyclovir, since I have not had infections. Hurrah!
My only
issue is on-and-off cramping when I get in an odd position. My thumbs, my
middle toes, my ankles, my shoulder blades… Strange places to be cramping. My
electrolytes are not low and I am apparently drinking enough water. It happens
at the oddest times. It only lasts a short while until I pull my muscle the
opposite direction. Other participants have had the same side effect.
NIH
doctors are keeping an eye on the unusual trisomy 13 that has cropped up in my
genetics, since it has nothing to do with CLL/SLL, and may or may not develop
into another blood disorder. It is not related to the trisomy 13 (Patau
syndrome) in which some babies are born, involving physical and mental
disorders. Trisomy 13 in adults usually doesn’t occur until people are in their
80s or 90s. I have always been told I am an “old soul,” so now I have proof.
LOL.
Another
strange thing is the presence of the protein CD34 on my baby platelets. Usually
those are found on baby white blood cells. Doctors are researching this odd
phenomena. There I go again… being an anomaly.
I am
happy with the medical report. I am happy with my son and our dear friend Tyler
running a marathon. And now I am off selecting the new tile for my house …
Saturday, March 30, 2013
This is a new day! With smart T-Cell vaccines
Recently I had the incredible experience of having a
face-to-face discussion with Dr. Lou DeGennaro, the Chief Mission Officer of
the Leukemia & Lymphoma Society (LLS) in the United States, on the
up-and-coming potential cure for those with 17p deleted CLL/SLL -- CARs
(chimeric antigen receptors). My son Rocky made it all happen for me and I am
so grateful.
On behalf of the Arizona Chapter of the LLS, Dr. DeGennaro
was scheduled to give a presentation at the Ritz-Carlton in Phoenix on the
topic “Someday is Today: A discussion on the latest advancements and strategies
in cancer research.” Rocky invited me to the event and took me to a cocktail
reception before the presentation. So with my glass of red wine in hand, Jim
Brewer, the Executive Director of the Phoenix LLS, introduced me to “Dr. Lou”.
We were having such an animated and scientific discussion
about CARs that I think we were boring some of the people in our circle. LOL. I
have discussed CARs in prior posts, but it doesn’t hurt to summarize what this
means to my potential cure.
LLS is funding Carl H. June, M.D. at the University of
Pennsylvania in Philadelphia for the personalized cancer therapy he initiated
on T-cell re-engineering. Dr. Weirda at M.D. Anderson is also researching CARs.
In fact, there are about seven CARs trials taking place today at a variety of
locations. Here is the summary of the first procedure at UPenn:
(1) T-cells are removed from the patient’s body through a
procedure called “apheresis.” Blood is removed from the patient and cells are
separated through a process of centrifugal force. (NOTE: I had this done when I
donated my cells to science. My cells were injected in a number of mice in the
NIH lab to research why I am so resilient. LOL.) This is a painless procedure,
similar to donating blood to a bank. My friend Janis witnessed me resting in
the bed during this procedure in June of last year.
(2) The extracted T-cells from the patient are engineered to
express a “chimeric antigen receptor” (CARs). The T-cells are harvested and
injected with benign HIV cells.
(3) After the T-cells are re-engineered, they are ready to
be infused back into the patient.
(4) The T-cell “serial killers” erradicate the cells with
the CD19 enzyme, and the procedure climaxes at about two weeks or so. Because
healthy B-cells also have CD19, the engineered T-cells cannot differentiate and
kill them as well.
(5) The patient often has the worst case of the “flu” ever
with sometimes a fever of 104 degrees.
NOTE: The first three clinical trial subjects at UPenn were
rushed to the hospital thinking they were dying. Shortly after the episode, the
three patients were tested for cancer, and found that there was no leukemia in
two and a minimal residual disease (a small number of leukemia cells remaining,
but no symptoms or signs of disease) in one.
NOTE: I was unable to credit the graphic designer who did this informational graphic, because there was no name attached to the image. If you are out there, let me know and I will give you full credit for your work.
For those of you not wanting the timeline details, skip to
the paragraph after the indented text.
CARs TIMELINE
• In 1987 it was
discovered that CD28 is the gatekeeper for T-cell proliferation.
• CARs research was
actually pioneered in vitro in 1989, but it took two decades for it to be tried
on humans.
• In 1993 a CD culture
system was produced with CD3/CD28 beads. Cell size were 4.5 microns each and
they were grown in vitro (test tubes)
• Three clinical
trials were conducted in 1998 with HIV patients.
The first HIV CAR
patients were treated targeting CD4z modified T-cells. They were infused with
the re-engineered T-cells like a blood transfusion. 41 of 43 patients have CAR
T-cells that have persisted more than a decade with no adverse effects.
• In 2006 the first
cancer patients were treated NCI and in the Netherlands. No clinical efficacy,
because T-cells did not engraft on the patients. Cells had half-lives and
lasted less than a week.
• Clinical trial.gov
#NCT01029366 at the University of Pennsylvania treated 12 subjects as of
September 2012:
July 31, 2010 the
first cancer subject was treated. The target was CD19, since it is expressed on
the surface of most B-cell malignancies. Ten patients had CLL/SLL and two had
ALL (acute lymphocytic leukemia). The patients were infused a 10-30-60% dose
for three days. Seven had a complete remission (CR). Two had a partial
remission (PR), and three had no remission (NR). No one has relapsed, and
T-cells continue to produce antibodies (Now for two years). Each person had a
total of 3.5 to 7 pounds of tumor cells removed from their body through this
procedure. Each re-engineered CAR T-cell (“serial killers”) can kill 1,000
tumor cells.
My Australian blog
friend John also passed on these links for my nerdy friends wanting more
information on CARs:
• Interview with William Wierda on CARS at
http://www.patientpower.info/video/new-t-cell-car-research-for-cll?autoplay=1
• CLL Global Research magazine 2-2012, particularly Page
4 for Kinase inhibitors & CARS at
http://www.cllglobal.org/Resource_Files/CLL_NL_Issue2_2012.pdf
• CARS research, a talk by Dr. carl June at
http://www.youtube.com/watch?v=jQfFCC6i5_o.
The initial problems with the CARs trial at UPenn were:
(1) the enzyme CD19 is also found on normal B-cells, so
patients are left immune compromised,
(2) Because the T-cells are harvested from each patient, it
is an expensive and time-consuming procedure, and
(3) the patient has to be in good enough health to provide
enough T-cells.
Researchers are getting closer to a cure. Future solutions:
(1) Now the new procedure involves re-engineering T-cells to
bind with a certain protein – ROR1, which is expressed in leukemia cells. ROR1
becomes the target.
(2) In order to be more cost-effective, as well as
efficient, researchers are exploring using healthy donor cells. This will also
help those patients who are deficient in T-cells to harvest.
An interesting bit of information is that research and
finding treatments and cures for blood cancers often leads to application to
other cancers. For example, the CARs trial at the University of Pennsyvania is
now using the concept of the re-engineered T-cells for trials in pancreatic
cancer. This CARs immunotherapy is a cure for leukemia and it is just around
the corner. This is a new day!
Check out this video:
Check out this video:
Friday, March 8, 2013
CLINICAL TRIALS
Over one million people in North America alone were affected
with blood cancer this year, according to the Leukemia & Lymphoma Society.
Anyone can get blood cancer. Scientists are studying the possible familial
connection or environmental connection. Sometimes it is just plain luck of the
draw.
Last month I attended an informative Leukemia & Lymphoma
Society event at Arizona State University’s Sky Song in Scottsdale on the topic
of clinical trials. I now wish to take this gift of knowledge and pass it on to
all the readers of my blog.
CLINICAL TRIALS
If you qualify for a cancer clinical trial, my first
response would be: “What are you waiting for?” The majority of participants
find that a clinical trial is a positive experience, and that they were treated
with quality medical care, dignity, and respect (Harris Interactive 2001). I
will second that motion. Having a research doctor answer the questions you have
submitted by email with a personal phone call is the best kind of medicine. I
know how busy they are, so I try not to abuse this wonderful option.
On the practical side, it does cost money, if the clinical
trial is far from your home. We have spent a good amount of money this past
year on flights, hotels, and meal stipends to travel across the United States
from Arizona. NIH reimbursed about one-third of the costs, which helped a lot.
Some sites do not reimburse any travel costs. Many participants are lucky to
find a clinical trial near their home and they can drive or have someone drive
them. Since traveling is stressful, you also need to consider whether the
patient is physically able to travel and be away from home.
Every available cancer therapy begins with research.
Researchers are not able to begin their discovery without funding. That is why
research grants are so vital. So here is a shout out to all those people who
raise funds for research! Thank you.
Once funding is available, the development of the therapy is
accelerated through clinical trials. The trial, however, is at a standstill
until cancer patients volunteer to participate. The sooner the number of
participants is reached, the sooner the research is conducted and presented.
Clinical trials
go through several phases. In a nutshell, here is a summary of the phases:
• Phase I trials test for safety of the drug, the best way
to administer it, and if cancer responds.
• Phase II trials test if one particular type of cancer
responds to the new treatment. Everyone gets the drug. For example, I am in a
Phase II clinical trial and the arm of the trial I am in is for participants
over the age of 18, who are untreated or treated, who have the poor prognosis
of 17p deletion.
• Phase III trials compare the new treatment to the standard
treatment, and test to see if it works better. There is no placebo. The
computer determines whether you get the new drug or the standard treatment.
• Phase IV trials continue researching long-term benefits
and side effects.
The process costs time and money, and requires
investigators, institutions, the federal government, the pharmaceutical
industry, and the public to cooperate and trust the process. Here is an
interesting fact from Banner M.D. Anderson (MDA): Out of 5,000 great ideas,
five go to clinical trial, but usually only one gets approved by the United
States Food & Drug Administration (FDA). The average cost is over one
billion dollars for a new drug application (NDA). The NDA is the process
through which drug sponsors propose that the FDA approve of a drug for sale to
be marketed in the U.S and become commercialized and available to patients.
Without clinical trials there would be no new cancer
therapies. Funding and participants are integral to the success of cancer
research.
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