Artículo sobre la solicitud de Venezuela a Interpol de Código Rojo en contra de supuestos acaparadores de productos médicos en el Estado Aragua, entrevista al Abogado Pedro Viloria. (Sección Latin America cont. pag. 8)
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Keeping you up to date on recent developments in oncology
By Mark McCarty, Washington Editor
ONCOLOGY EXTRA
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New approach could kill tumor cells
in the brain better and avoid side effects
Every year, about 100,000 Americans are diagnosed with
brain tumors that have spread from elsewhere in the body. These
tumors, known as metastases, are usually treated with surgery
followed by chemotherapy, but the cancer often returns.
A new study from MIT, Brigham and Women’s Hospital, and
Johns Hopkins University suggests that delivering chemotherapy
directly into the brain cavity may offer a better way to treat tumors
that have metastasized to the brain (Intracranial microcapsule
chemotherapy delivery for the localized treatment of rodent
metastatic breast adenocarcinoma in the brain, PNAS, (www.
pnas.org/cgi/doi/10.1073/pnas.1313420110). Testing their new
approach in mice, the researchers found that the chemotherapy
drug temozolomide (TMZ) was more effective when delivered
via tiny capsules implanted inside the skull. This suggests that
a similar approach might be more effective in human patients,
says Michael Cima, the David H. Koch Professor of Engineering
at MIT and a senior author of the study, which appears this
week in the Proceedings of the National Academy of Sciences.
“Metastatic disease should be sensitive to chemotherapy, but
systemic chemotherapy has not proven effective because it’s not
getting to the brain at a high enough dose for a long enough
period of time,” says Cima, who is also a member of MIT’s Koch
Institute for Integrative Cancer Research. “We’re showing we get
much higher degrees of tumor cell death when we deliver the
drug locally.”
Targeted delivery: The researchers delivered chemotherapy
drugs via implantable microcapsules made of a biocompatible
material called liquid crystal polymer. The capsules are small
cylinders with a 1.5-milliliter drug capacity; the drug diffuses out
through a small hole. The researchers tested 2 chemotherapy
agents: TMZ, which is a first-line treatment for brain metastasis
and gliomas, and doxorubicin, a common treatment for breast
cancer, which often metastasizes to the brain.
Zone of influence: Working with mice implanted with
tumors similar to human brain metastases, the researchers
found that TMZ delivered directly to the brain prolonged survival
by several days compared with TMZ administered by injection.
They also found higher rates of apoptosis, or programmed cell
death, in tumor cells near the capsules.
The Global Incidence and Prevalence Report from
the Incidence and Prevalence Database (IPD), states that
worldwide, 800,000 patients are on chemotherapy. In England,
the number of patients receiving chemotherapy each year is
increasing. An estimated 65,000 chemotherapy programs (a
planned period of repeated cycles of treatment) are delivered
annually. In the US, with over 25 million doses administered
annually, oral chemotherapy is an expanding and potentially
hazardous treatment for cancer patients. In a 2006 survey of
US cancer centers, only 1 in 4 centers had standard prescribing
safeguards in place for oral chemotherapies, and fewer than 1 in
5 had measures to ensure safe administration and monitoring.
Evidence behind complementary therapies is mixed
Cancer is frightening enough to prompt a lot of speculation
as to what might cure or treat it, a parade of offerings that
probably did not start with Laetrile. A recent statement by
Columbia University (New York) takes up the matter of these
alternative therapies, stating that some score well, while
others fall short. As might be expected, “meditation, yoga,
and relaxation with imagery were found to have the strongest
evidence supporting their use” compared to some treatments,
earning a grade of A, including for routine use to aid in dealing
with anxiety and other mood disorders often encountered by
breast cancer patients. Acupuncture scored a grade of B for
controlling chemotherapy-induced nausea and vomiting and
can be recommended to most patients. On the other hand, more
than two dozen other interventions, a list said to include “some
natural products and acupuncture for other conditions,” offered
slimmer bases of evidence “due to either small study sizes or
conflicting study results, and received a C grade,” the statement
notes. Among the modern abject failures is acetyl-l-carnitine,
marketed to prevent chemotherapy-related neuropathy, but
which actually increased risk for the condition.
French team picks up early lung cancer cells with ISET
Researchers at the French Institute of Health and Medical
Research (Institut national de la santé et de la recherche
médicale, or Inserm), have made headway in the effort to provide
early detection of lung cancer with ISET filtration-enrichment
techniques, a development that could beat CT scanning to a
definitive diagnosis by “several months, and in some cases
several years,” according to an Inserm statement. The statement
explains that the study tracked 245 people without cancer,
including 168 deemed at risk due to COPD, and the blood test
picked up circulating cancer cells in five patients (3%) despite
that imaging did not show any nodules in the lungs. In these
five patients, a nodule became detectable between one and
four years after detection of circulating cancer cells by the ISET
filtration method, and they each immediately underwent surgery
with biopsy of the removed lesion confirming the diagnosis.
A one-year check-up showed no sign of recurrence in the five
patients, and no nodules were detected during monitoring
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of subjects who did not have circulating cancer cells, while
no cancer cells were detected in the bloodstream of “control”
subjects without COPD. This research appears in Plos One under
the title “Sentinel Circulating Tumor Cells Allow Early Diagnosis
of Lung Cancer in Patients with Chronic Obstructive Pulmonary
Disease.”
Louisiana State University snares
award for breast cancer support
The Louisiana State University (LSU; Baton Rouge) School of
Public Health has been awarded a $2.2 million grant to increase
the availability of health information and support services for
young breast cancer survivors in the American Gulf South,
according to a Nov. 3 LSU statement. The Centers for Disease
Control and Prevention made the award, which will be paid out
over five years, to support the development and implementation
of strategic and integrated multi-media health education and
awareness campaigns to address the health information needs of
these patients. LSU will use the money to bring together a three-state
coalition from organizations in Louisiana, Mississippi, and
Alabama that will go by the name of the Gulf States Young Breast
Cancer Survivors Network. LSU’s Donna Williams, will serve as
the principal investigator in the program, which is tasked with
developing and disseminating “pertinent and culturally sensitive
health information via social media.” Messages will address
family history and genetic risks, psychosocial health and support,
reproductive health and fertility, family support, health monitoring
and evidence-based preventive lifestyle behaviors like maintaining
a healthy weight, reducing tobacco use and excessive alcohol use.
NSAIDs fight cancer by inducing apoptosis
Aspirin has seemed for decades like a mystery drug, but a
recent statement by the University of Pittsburgh (Pittsburgh)
School of the Health Sciences explains how salicylic acid and
other non-steroidals influence colorectal cancer (CRC). The
statement notes that a recent study appearing in the Proceedings
of the National Academy of Sciences consisting of experiments
in animal models and tumor samples from patients who had
taken NSAIDs and those who hadn’t suggests that NSAIDs
activate the “death receptor pathway.” This pathway is credited
with selectively triggering a suicide program in intestinal stem
cells that have a mutation in the APC gene that renders the cells
dysfunctional. Healthy cells lack the mutation, so NSAIDs exert
no effect on those cells. In that manner, the drugs instigate the
early auto-destruction of cells that could lead to pre-cancerous
polyps and tumors. Senior investigator Lin Zhang, said the study
“identifies a biochemical mechanism that could explain how this
preventive effect occurs,” adding, “these findings could help us
design new drugs to prevent colorectal cancer, which is the third
leading cause of cancer-related deaths in the country.”
Eribulin shown to extend survival in breast cancer
Makers of companion diagnostics may have more reason
to invest in a test associated with eribulin (or Halaven, made by
Eisai of Tokyo) thanks to a recent statement by Cancer Research
UK (London). The statement explains that this drug, which was
developed from chemicals found in sea sponges, may offer women
with advanced triple negative breast cancer an average of five extra
months of life. Researchers looked at two major clinical trials of
more than 1,800 women with breast cancer that had started to
metastasize, and the phase III trials compared the survival of women
treated with eribulin to those given standard treatment. The two
studies showed an overall improvement in survival of more than
two months for women treated with eribulin. The most significant
improvement was seen in women with the advanced triple negative
form of breast cancer, where there are limited treatment options;
these women’s survival improved by nearly five months. There was
also a survival boost of more than two months for women with the
HER2 negative form of breast cancer.
East, West Coast institutes win genomic pilot contract
The Broad Institute of MIT and Harvard (Boston) and two
institutions in the California state university system have won
an award from the National Cancer Institute Cancer Genomics
Cloud Pilot that will go toward the building of a system that will
enable large-scale analysis of The Cancer Genome Atlas (TCGA)
and other datasets by co-locating the data and the required
computing resources in one cloud environment. This co-location
will enable researchers across institutions to bring their analytical
tools and methods to use on data in an efficient, cost-effective
manner, thereby promoting democratization and collaboration
across the cancer genomics community, the statement explains.
Large-scale sequencing efforts are helping researchers understand
the genetic changes that lead to cancer and have led to the
development of several successful, targeted chemotherapies.
These developments show that identifying mutations that drive
cancer can translate into therapeutics. However, three main
challenges remain: first, processing massive sequence datasets
requires costly computational infrastructures for which few groups
have the resources; those that do have the resources often end up
duplicating each others’ engineering and analysis efforts. Second,
data generation is outpacing the development of tools and methods
that can be used on such large datasets: already, petabytes of data
exist, and exabytes are on the near horizon. Finally, data is being
collected and stored in silos, minimizing the potential for synergy,
data sharing and integrated analysis. Gad Getz, of the Broad
Institute said the pilot “will allow the cancer research community
to collaborate in a way that has not been possible before. We’ll now
be able to share data and tools and jointly learn from the totality
of cancer genomics data. Our cloud system will democratize
access to computational tools for non-experts as well as empower
developers with a platform for creating the next generation of
analytical methods.”