<unk> , also called<unk>  healing or<unk>  regression, is an unexpected improvement or cure from a disease that usually progresses. These terms are commonly used for unexpected transient or final improvements in cancer.<unk> s concern cancers of the haematopoietic system (blood cancer, e.g. leukemia), while<unk>  regressions concern palpable tumors; however, both terms are often used interchangeably.
Spontaneous remission
Progressive disease
Biphasic disease
Resistant cancer
Recrudescence
Infodemic
Precancerous condition
Acute toxicity