Insurance instability appears to make this gap even wider.
The body of research we analyzed primarily tracked patterns in existing data rather than through controlled experiments. That makes it difficult to say with certainty that insurance status directly causes differences in survival.
However, the pattern we observed was consistent across many studies. Moreover, most studies recorded insurance status only at the time of diagnosis, which misses changes that happen during treatment. Patients may lose or gain coverage in the middle of their care.
Future research that tracks insurance continuously throughout treatment, standardizes how coverage is categorized and examines specific cancer types and age subgroups in greater depth could clarify the picture further.
