Introduction:
Cancer and its treatment with cytostatic drugs entails a number of negative experiences, emotions and side effects. Taking care of a oncological patient reveals a strong dependence between the quality of life and the patient's abilities and capabilities to meet their individual needs.

Objective:
Evaluation of the quality of life and assessment of the influence of cancer treatment with cytostatic drugs on the quality of life of patients with blood cancers.

Material and methods:
The study was conducted among 50 patients from the Department of Hematology, Blood Cancer and Bone Marrow Transplantation. In order to examine the quality of life of people in the course of treatment with cytostatic drugs in hematological cancers, a diagnostic survey method was implemented with the use of the author’s self-designed questionnaire and the EORTIC QLQ-C30 questionnaire in the Polish version.

Results:
Analysis of the results of the study material reveals that:  almost all the respondents suffered side effects of cytostatic medication;  half of the respondents could not define their quality of life as good or bad;  regardless of gender, the respondents function best in the cognitive aspect.

Conclusions:
The illness and its treatment had a greater negative impact on the sexual life in men than in women. 1. Women evaluated the quality of life significantly worse in terms of physical functioning, whereas men evaluated significantly worse the quality of life in terms of symptoms such as pain, shortness of breath and constipation. 2. Fatigue, as a symptom of the disease, was the most common ailment mentioned by the respondents. 3. Demographic factors, i.e age, marital status, professional activity, education level and place of residence correlated with the selected domains of life quality. 4. The overall assessment of patients' quality of life was reduced on average by 50%.