Tumour risks and genotype-phenotype correlations associated with germline variants in succinate dehydrogenase subunit genes &lt;i&gt;SDHB&lt;/i&gt;, &lt;i&gt;SDHC&lt;/i&gt; and &lt;i&gt;SDHD&lt;/i&gt;. The gene discussed is SDHB; the disease is neoplasm.