The role of the psycho-oncologist alongside the oncologist in increasing the patient's adherence to the cancer treatment plan is based on the principle that treatment adherence is not only a function of the patient's awareness of the necessity of treatment, but is also influenced by anxiety, depression, disease-related beliefs, complications of treatment, cognitive problems, social support, costs, access to services, and the quality of the patient's relationship with the treatment team. In this framework, the oncologist is responsible for explaining the diagnosis, treatment goals, medical options, possible complications, and follow-up plan, and the psycho-oncologist helps to identify and reduce the psychological and behavioral barriers affecting the implementation of the program. The goal of collaboration is not to force the patient to accept a medical decision, but rather to increase the patient's understanding, conscious participation, self-efficacy, and ability to follow the plan that has been set for him after the therapeutic dialogue and joint decision-making.
First, the psycho-oncologist should evaluate the individual factors influencing adherence. Severe anxiety may cause avoidance or postponement of decision-making, depression can reduce the patient's motivation and energy, and fear of treatment complications may cause medication to be discontinued or changed arbitrarily. Some patients are also hesitant to seek medical treatment due to certain beliefs about cancer, negative experiences of those around them, or misinformation available online. Memory and concentration problems, sleep disturbances, pain, and fatigue can also make it difficult to implement treatment orders. Identifying these factors helps the treatment team identify real barriers to behavioral therapy and design interventions for them, rather than interpreting non-compliance as "patient irresponsibility."
Collaboration between the psycho-oncologist and the oncologist is also essential in therapeutic education and communication. The oncologist provides medical information about the nature of the disease, treatment goals, timing of interventions, and possible complications, and the psycho-oncologist can assess the patient's understanding, concerns, beliefs, and emotional reactions to this information. Using understandable language, giving the patient the opportunity to ask questions, reviewing their perception of the treatment plan, and correcting misconceptions can increase active participation. In this process, shared decision-making is important because the patient can participate responsibly in the implementation of the treatment plan when they have received the necessary information, understood the relevant options, and taken into account their values and preferences in the decision-making process.
One of the most important areas of psycho-oncological intervention is the promotion of self-efficacy. The patient should feel able to manage some of the therapeutic tasks, such as adjusting the time of taking medications, regular visits, reporting complications, adhering to nutritional recommendations and activity appropriate to medical conditions, and communicating with the treatment team in a timely manner. The psycho-oncologist can increase the patient's sense of empowerment by setting small and achievable goals, teaching problem-solving skills, correcting dysfunctional thoughts, and reinforcing successful behaviors. For example, if the patient is hesitant to continue treatment due to fear of nausea or fatigue, his/her concern can be specifically identified and appropriate coping strategies can be taught along with the medical plan for complication control.
Controlling treatment complications is also an important part of adherence and requires direct collaboration between the two specialties. Nausea, pain, fatigue, insomnia, changes in appetite, and physical problems may make the patient reluctant to continue treatment. The oncologist and medical team must investigate the cause and medical management of these symptoms, and the psycho-oncologist can work alongside it on anxiety, fear, emotion regulation, coping skills, and adaptive behaviors. This collaboration is important because reducing distress can increase the patient's capacity to manage complications and follow up on treatment recommendations, while inadequate control of physical symptoms may make adherence difficult even with high motivation.
Family support also plays a decisive role in many patients. The psycho-oncologist can educate the family about the patient's psychological and practical needs if they are satisfied, and help family members to turn their support from the form of pressure, blame, or excessive control into effective support. The family can play a role in reminding the time of visits, accompanying them to therapy sessions, providing emotional support, and identifying worrying changes, but the patient's autonomy and choice must be maintained. In this regard, it is also necessary to examine social and economic conditions, as commuting problems, treatment costs, family or job responsibilities, and limited access to services may be barriers that cannot be solved by psychological intervention alone, and require social support and coordination of the treatment system.
In patients with resistance or doubt about treatment, the psycho-oncologist should not play a persuasive or pressing role. The professional approach is to investigate the cause of the doubt, clarify the patient's information and beliefs, identify values and concerns, and facilitate an informed dialogue with the oncologist. The patient may fear certain complications, have questions about the effectiveness of treatment, or have conflicted between medical advice and invalid information on the Internet. In such a situation, empathetic and non-judgmental communication can provide an appropriate opportunity to address concerns. The final decision about treatment should remain within the scope of medical care and the patient's right to make informed choices.
Continuous monitoring is also an important component of this model. Treatment adherence may change along the course of the cancer, so it is necessary to examine new barriers in the stages of diagnosis, active treatment, end of treatment, and follow-up. Changes in mood, increased fatigue, the occurrence of complications, changes in family circumstances, or fear of recurrence can affect the patient's therapeutic behavior. Psycho-oncologists and oncologists can modify the support program to suit the new situation by communicating regularly and recording the patient's goals and problems. In cases of severe depression or anxiety, significant cognitive problems, or psychological crisis, referrals to a psychiatrist or other relevant professionals should also be included in the care plan.
The important limitation of this approach is that not all cases of non-compliance have a psychological origin and the responsibility for structural, economic, or medical complications should not be placed on the patient or the psycho-oncist. Also, increasing adherence should not mean passive obedience to the patient's orders, but the main goal is to consciously and empowerfully participate in a treatment plan tailored to the individual's circumstances. In general, the cooperation between the psycho-oncologist and the oncologist is most effective when it starts from the information and decision-making stage and continues to the management of complications, strengthening self-efficacy, family support, solving behavioral and social barriers, and continuous monitoring. Such an approach can transform the patient from a passive recipient of services to an active participant in the treatment process and pave the way for a more orderly and informed implementation of the cancer treatment plan.