Aim: We aimed to document the prevalence of misunderstanding in cancer pati
ents and investigate whether patient denial is related to misunderstanding.
Patients and methods. Two hundred forty-four adult cancer outpatients recei
ving treatment completed a survey assessing levels of understanding and den
ial. Doctors provided the facts against which patient responses were compar
ed. Multiple logistic regression analyses determined the predictors of mis
understanding.
Results: Most patients understood the extent of their disease (71%, 95% CI:
65%-77%) and goal of treatment (60%, 95% CI: 54%-67%). Few correctly estim
ated the likelihood of treatment achieving cure (18%, 95% CI: 13%-23%), pro
longation of life (13%, 95% CI: 8%-17%) and palliation (18%, 95% CI: 10%-27
%). Patient denial predicted misunderstanding of the probability that treat
ment would cure disease when controlling for other patient and disease vari
ables (OR = 2.20, 95% CI: 0.99-4.88, P = 0.05). Patient ratings of the clar
ity of information received were also predictive of patient understanding.
Conclusions. Patient denial appears to produce misunderstanding, however, d
octors' ability to communicate effectively is also implicated. The challeng
e that oncologists face is how to communicate information in a manner which
is both responsive to patients' emotional status and sufficiently informat
ive to allow informed decision-making to take place.