Yes, cancer insurance premiums may be tax-deductible under certain circumstances. In the United States, the deductibility of cancer insurance premiums depends on whether the policy is considered a qualified medical expense. According to the Internal Revenue Service (IRS), eligible medical expenses include premiums for long-term care insurance, but not for specific disease insurance policies, such as cancer insurance, unless they are paid through a health savings account (HSA) or a flexible spending account (FSA) that meets certain criteria. It's important to consult with a tax professional or refer to the latest IRS guidelines to determine the specific deductibility of cancer insurance premiums in a given tax year. Additionally, tax laws and regulations may vary by country, so individuals outside the United States should consult with local tax authorities or professionals for guidance on the deductibility of cancer insurance premiums in their respective jurisdictions.