oncolytic virus designed to seek out, attack and
destroy tumor cells. It is designed to reproduce
selectively in tumor cells that exhibit activity
via EGFR/Ras, but not in normal tissue. In this
study the authors conducted a clinical trial on
a group of patients all of whom had advanced
cancer affecting various organs and who did
not respond to conventional treatments. The
patients received a single injection of the genetically
modified JX-594 virus at different doses.
Analysis of the biopsies from the tumors showed
that in several patients the virus was able to
infect and multiply in tumor cells but not in
normal healthy tissue. Furthermore, expression
of the foreign gene that had been inserted into
the virus to aid its detection was also discovered
in the tumors. This virus was well tolerated by
the patients even at the highest doses as the only
side effect was a flu-like malaise, which lasted
only 1 day.
This is the first time that a viral therapy that
replicates exclusively in tumoral tissue after
intravenous injection has been successful in
humans. This strategy allows foreign genes to
be selectively expressed in tumor cells, which
opens up the possibility of selectively inserting
therapeutic substances into solid tumors
in humans. Although with this approach the
researchers did not manage to cure any of the
patients, they have shown that we are already
able to modify certain viruses, inject them into
patients, make the virus seek out only tumor
cells while ignoring all healthy cells and have
them inject the appropriate antidote. The
authors of this paper have produced the ‘magic
bullet’, which perhaps in the future we may tailor
to make it effective against different types
of cancer.
“This strategy allows foreign genes to be
selectively expressed in tumor cells,
which opens up the possibility of
selectively inserting therapeutic
substances into solid tumors in humans.”
Curing human diseases is a complex problem
that requires complex solutions. It is only
through coordinated and interdisciplinary work
that teams of microbiologists, molecular biologists,
computer biologists, engineers, chemists,
physicians and other professionals will be able
to provide new and original solutions. In recent
months we have seen examples of how the synthetic
manipulation of bacteria and viruses
allows the design of new strategies that offer
oncolytic virus designed to seek out, attack anddestroy tumor cells. It is designed to reproduceselectively in tumor cells that exhibit activityvia EGFR/Ras, but not in normal tissue. In thisstudy the authors conducted a clinical trial ona group of patients all of whom had advancedcancer affecting various organs and who didnot respond to conventional treatments. Thepatients received a single injection of the geneticallymodified JX-594 virus at different doses.Analysis of the biopsies from the tumors showedthat in several patients the virus was able toinfect and multiply in tumor cells but not innormal healthy tissue. Furthermore, expressionof the foreign gene that had been inserted intothe virus to aid its detection was also discoveredin the tumors. This virus was well tolerated bythe patients even at the highest doses as the onlyside effect was a flu-like malaise, which lastedonly 1 day.This is the first time that a viral therapy thatreplicates exclusively in tumoral tissue afterintravenous injection has been successful inhumans. This strategy allows foreign genes tobe selectively expressed in tumor cells, whichopens up the possibility of selectively insertingtherapeutic substances into solid tumorsin humans. Although with this approach theresearchers did not manage to cure any of thepatients, they have shown that we are alreadyable to modify certain viruses, inject them intopatients, make the virus seek out only tumorcells while ignoring all healthy cells and havethem inject the appropriate antidote. Theauthors of this paper have produced the ‘magicbullet’, which perhaps in the future we may tailorto make it effective against different typesof cancer.“This strategy allows foreign genes to beselectively expressed in tumor cells,which opens up the possibility ofselectively inserting therapeuticsubstances into solid tumors in humans.”Curing human diseases is a complex problemthat requires complex solutions. It is onlythrough coordinated and interdisciplinary workthat teams of microbiologists, molecular biologists,computer biologists, engineers, chemists,physicians and other professionals will be ableto provide new and original solutions. In recentmonths we have seen examples of how the syntheticmanipulation of bacteria and virusesallows the design of new strategies that offer
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