This study investigates differences in attitudes towards, and experiences with, online electronic health records between cancer patients and patients with other conditions, highlighting what is characteristic to cancer patients. A national patient survey on online access to electronic health records was conducted, where cancer patients were compared with all other respondents. Overall, 2587 patients completed the survey (response rate 0.61%). A total of 347 respondents (13.4%) indicated that they suffered from cancer. Results showed that cancer patients are less likely than other patients to use online electronic health records due to general interest (p < 0.001), but more likely for getting an overview of their health history (p = 0.001) and to prepare for visits (p < 0.001). Moreover, cancer patients rate benefits of accessing their electronic health records online higher than other patients and see larger positive effects regarding improved communication with and involvement in healthcare.