Question

Self-sabotage: Why cancer
vaccines don’t work
The possibility of turning the body’s own immune
system against tumor cells has hovered like a medical
mirage over the cancer-research community for decades.
While tumors emerge from healthy cells that start to grow
with abandon, they have enough tumor-specific features
that should make them easy targets for an alert immune
system that’s trained to distinguish between molecular
friends and foes. And this idea was supported by several
encouraging trials of therapeutic cancer vaccines, which
effectively shrank tumors in cell cultures in the lab.
But when these promising vaccine candidates, including
ones against melanoma and lymphoma, were tested in
patients, they invariably disappointed. While they promoted
some immune response from the cancer patients, this
response wasn’t enough to make a dent in tumors. Now
researchers report in the journal Nature Medicine that the
vaccines themselves may be at fault. […]
Alice Park, mar. 2013.

O estudo reportado no texto concluiu que:
a as próprias vacinas podem ser as culpadas pela
ineficácia demonstrada em testes com pacientes
humanos.
B os testes com pacientes humanos serão logo
abandonados por não apresentarem resultados
satisfatórios.
c as vacinas testadas não provocaram qualquer res-
posta imunológica nos pacientes.
D somente vacinas contra melanoma e linfoma foram
testadas pelos pesquisadores.
e as próprias vacinas podem estar em falta no mer-
cado em breve.

Answer 1

D somente vacinas contra melanoma e linfoma foram
testadas pelos pesquisadores.
e as próprias vacinas podem estar em falta no mer-
cado em breve.