91.   So far, however, there is little data showing that the drug works.

92.   Some scientists says drugs will work better for some diseases and cells for others.

93.   Still, predicting how a new drug will work in the human body remains well beyond the reach of science.

94.   Such drugs may work on lung, colon and pancreatic tumors that have active receptors, but not on the lung, colon and pancreatic cancers that do not.

95.   Such differences, known as single nucleotide polymorphisms, could become important in determining which drugs will work best for which patients.

96.   That means even if a patient becomes resistant to one of the drugs, the other drug will work for the patient when used alone.

97.   The big question now, for doctors as well as stockbrokers, is whether the drug will work well enough for first-time users to seek refills.

98.   The companies returned today without doing another study, though they will present new data from the ongoing studies as well as new information about how the drug works.

99.   The company said the drug had no adverse effect on the way the anti-cancer drugs worked or the time patients spent in remission.