还不能这样说，因为这个基因突变有的增加了某些肿瘤（如乳腺癌）的危险性，有的直接与肿瘤相关（如膀胱癌）.

Inactivation of the p53 tumor suppressor is a frequent event in tumorigenesis. In addition to its role in blocking tumorigenesis, p53 hampers 
malignant phenotypes such as tumor invasion and metastasis.

Here are two papers:

2011, http://gan.sagepub.com/content/2/4/466.full

2014, http://jcb.rupress.org/content/204/7/1191.full.pdf+html