Cancer patients need to be prepared for serious side effects from chemotherapy, and hospitalization is one that happens much more often in the real world than in drug trials, according to a new study. Researchers found that people with advanced lung cancer receiving chemotherapy in real-world settings were almost eight times more likely to be hospitalized during treatment than those participating in clinical trials. What's more, very few clinical trials even report how often participants are hospitalized during the research, the study authors found. Clinical trials should be routinely reporting their hospitalization rates so we know what to expect," said senior author Dr. Monika Krzyzanowska, a medical oncologist at the Princess Margaret Cancer Center in Toronto, Canada. Krzyzanowska and her colleagues write in JAMA Oncology that the number of times a person goes to the hospital with treatment complications is important to the patient and to the hospital. The researchers suggest several possible explanations for the differences in hospitalization rates. First, the patients in highly selective clinical trials are different from real-world patients. In this study, people receiving chemotherapy in real-world settings were also older, on average, than those in clinical trials.