Dr. Boockvar believes that these patients’ drug level of resistance might be because of a class of stem cells resistant to obtainable treatments. ‘Some patients’ human brain tumors react to chemotherapy and some don’t,’ says Dr. Boockvar. ‘We believe cancer stem cells may be the cause.’.. Cancer stem cells could be cause of brain tumors Expert available for comment on ‘Cancers Stem Cells’ symposium in American Society of Hemotology meeting, led by Dr.‘These research have identified brand-new and essential potential cardiac risks connected with BPA exposure which may be especially very important to women’s heart wellness,’ he says.. Chemotherapy associated with speech difficulties among tumor patients Patients who’ve received high dosages of chemotherapy could find it harder to express themselves verbally, according to new research from the Sahlgrenska Academy at the University of Gothenburg, Sweden. Speech issues among cancer patients who received chemotherapy treatment were 2 times higher than among those that did not.