any chemotherapy drugs may cause birth defects. It is important that a woman undergoing chemotherapy avoids becoming pregnant. As most chemotherapy medications interfere with oral contraceptives it is important to use a barrier method of contraception, such as condoms, during the whole chemotherapy treatment period and for a year after treatment is completed. If you are pregnant you need to tell the medical team straight away beforehand. If you become pregnant during treatment tell the medical team straight away.