Careful guys,
Tarceva is not like your regular chemo therapy.
It is a targeted drug that inhibits tyrosine kinase (EGFR). Erbitux also targets that receptor but from the outside of the cells, while tarceva works from the inside. It is a much much smaller molecule and not a protein. There are also side effects however, apparently on can also get a rash (and others), I have no idea how severe this is and how frequently it occurs.
Perhaps those who had it will pipe up?

M