definitely still have hair. >> yeah, i still have hair. >> yuccas: it looks cute. >> it really is one of the most distressing parts of treatment. >> yuccas: is it because your hair is part of your identity? >> yes. femininity and feeling lovely and beautiful, and it is part of your identity, and with the breast cancer treatment, like, so much of that has already been stripped from you. >> yuccas: thank you to alana. if you were wondering, studies show about 65% of patients who use ice caps do keep most of their hair. we learned today of the death of one of america's great writers. joan didion bridged the world of literature, hollywood, and journalism, chroniclin contemporary american society. she also wrote about the depths of her own grief following the death of her husband and daughter. her publisher says didion died at home in new york due to complications from parkinson's disease. joan didion was 87. still ahead on tonight's "cbs evening news," an overnight