Isolated case — an individual who is the only member of his or her kindred affected by a genetic disorder, either by chance or by new mutation. See also sporadic.

一个家系中唯一的患病个体，可由上代遗传基因决定，也可由于新突变产生。参见散发。

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Conclusion R492X nonsense mutation of PINK1 gene was rare in Chinese sporadic patients with PD.

结论PINK1基因R 492x无义突变不大可能是中国散发性帕金森病患者的突变热点。

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Objective To explore the mutation of RET gene exon 11 in sporadic medullary thyroid carcinoma and to clarify the relationship between RET mutation and sporadic medullary thyroid carcinomas.

目的分析散发型甲状腺髓样癌RET基因第11外显子碱基序列，明确RET基因突变与散发型甲状腺髓样癌的关系。

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That's because most women don't have the mutation and because most breast cancer is sporadic.

CNN: What Angelina Jolie forgot to mention