Spontaneous remission

Spontaneous remission, also called spontaneous healing or spontaneous regression, is an unexpected improvement or cure from a disease that appears to be progressing in its severity. These terms are commonly used for unexpected transient or final improvements in cancer. Spontaneous remissions concern cancers of the haematopoietic system (blood cancer, e.g. leukemia), while spontaneous regressions concern palpable tumors; however, both notions are often used interchangeably.