Trial Information

Study to the Optimal Duration of Therapy With Oral Angiogenesis Inhibitors

Until now, in trials it is common to stop therapy when progressive disease occurs; RECIST
criteria are used, in which progressive disease is defined as >20% increase of the sum of
the longest diameter of the lesions, or occurence of new lesions. However, angiogenesis
inhibitors have a rather cytostatic than cytotoxic effect compared to chemotherapeutics, as
a result of which less frequently reduction of tumor volume is being seen.

Often in the centre of the lesion necrosis is shown. Sometimes accompanied with edema; so
even tumor volume increase can be the result without real progression being the case.
Recently, in our clinic, we found a number of patients, treated with oral angiogenesis
inhibitors, a remarkable quickening of progressive disease and complaints after stopping
this treatment. Reintroduction of the same or another type of angiogenesis inhibitor
subsequently lead to a new stabilization. The causality of this phenomenon is unknown.
Perhaps that the inhibitory effect of the angiogenesis is not fully exhausted at the moment
that progressive disease on CT is observed. An alternative explanation is contra reaction of
longterm angiogenetic inhibition through upregulation of proangiogenic factors with
subsequent vascular expansion and edema. This study means to gain more insight information
about the optimal treatment policy when progressive disease is found in patients treated
with oral angiogenesis inhibitors. Because of the increase of patients that is being treated
with these products, both in trials as in daily clinical practice, this is important to
investigate.