chemosensitivity

Noun

 * 1)  A measure of the sensitivity of a tumour to the effects of an anticancer drug.
 * 2)  A measure of the sensitivity of a microbial sample to the effects of an antimicrobial drug.

Usage notes
The microbial sense is less common than the tumor sense; in current usage antibiotic sensitivity is seldom called chemosensitivity, just as antibiotic therapy is seldom called chemotherapy today.