Malignant change - The squamous epithelia in craniopharyngiomas may rarely undergo malignant transformation into squamous cell carcinoma, usually as recurrence.
颅咽管瘤虽然经常复发，但是其鳞状上皮恶变成鳞癌非常罕见的。
The main reason of treatment failure in local advanced nasopharyngeal carcinoma is distant metastasis and local recurrence.
局部晚期鼻咽癌治疗失败的主要原因为远处转移和局部复发。
In the cases of upper urinary tract carcinoma associated with bladder carcinoma, higher grade malignancy and lower ureter carcinoma the recurrence rate was higher and usually occurred within 3 years.
上尿路移行细胞癌合并膀胱癌、肿瘤恶性程度高及输尿管下段癌其术后膀胱癌的再发率高，再发时间多在术后3年以内。
应用推荐