Functional status (FS) is a concept that is important in caring for cancer patients and is used to assess the effect of cancer on self-care and daily activities. Considered a component of global health-related quality of life (HRQOL) (Petrick et al., 2014), poor FS scores may lead to loss of autonomy and impairment in the quality of life of cancer patients (Ghanbari et al., 2011). The concept of functional status can be defined as the level of activities performed by an individual to realise needs of daily living in many aspects of life including physical, psychological, social, spiritual and intellectual roles. Level of performance is expected to correspond to normal expectation in the individual's nature, structure and conditions, all of which are affected by the patient's perceptions of the effect of the disease and its related treatments on her/his daily functioning (Wang, 2004). Because understanding functional status is key for delivering patient-centred care and helping patients and their families determine the need for long-term services and supports (Spar et al., 2017), it should be taken into consideration during treatment period (Ozkan & Ogce, 2008). In addition, the functional status is affected by biological condition such as age and gender, acute and chronic nature of the disease and its symptoms, disability and the use of drugs for treatment of diseases. (Ogce & Ozkan, 2008). Functional status includes doing daily activities, meeting basic needs, playing roles and maintaining health and well-being, along with the medical, emotional and cognitive health of the individual. Thus when disease prevents a person