The Russian Ministry of Health announced that more than 90% of patients with malignant neoplasms develop antibodies to covid after vaccination. This means that they must be vaccinated without fail.
There are a number of vulnerable populations that are at increased risk of contracting coronavirus infection. These include the elderly, immunocompromised individuals, victims of various chronic diseases such as diabetes and COPD, and obese patients. Cancer patients are also included in this list, because as a result of the treatment of cancer with heavy drugs, the defenses of their body weaken. Accession of any opportunistic infection in such position is life-threatening. In this regard, it is extremely important to know whether these patients are helped by vaccinations against coronavirus.
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And now the Russian Ministry of Health announced the publication of data from several studies conducted in full accordance with existing scientific standards, which showed that cancer patients respond well to vaccination. More than 90% of them have specific antibodies that react to viral antigens. Moreover, there is a wide variability in the level of these antibodies, but it is still lower than in people without tumors who have been through vaccines.
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Sputnik V is recommended for use among all cancer patients if they have already completed treatment that suppresses their immunity. The type of tumor is irrelevant here. Such patients are not contraindicated in any means of preventing and treating coronavirus infection, which include vaccinations. (READ MORE) 
Ministry of Health of Russia
Medicine
federal body executive power of the Russian Federation, performing the functions of developing state policy and legal regulation in the field of healthcare,