二重和三重原发癌即多原发癌(multiple primary malignant neoplasms),按国内资料,全身多原发恶性肿瘤的发病率占确诊恶性肿瘤的0.4～0.52%,一般以患二个癌瘤者占绝大多数(93%),同一患者先后罹患三个以上的原发癌仅占7%,多原发癌的发病率虽然不高,但对间隔期较短的多原发癌 Primary and secondary triple primary malignant neoplasms, according to domestic data, the incidence of systemic multi-primary malignancies accounts for 0.4 to 0.52% of diagnosed malignant tumors, usually with two cancers The vast majority (93%), the same patient had three or more primary cancers only 7%, although the incidence of multiple primary cancer was not high, but the short interval of multiple primary cancer