Structural Analysis of Social Behavior: Using Cluster Analysis to Examine Intrapsychic Personality Traits Associated With Depression in Women With Breast Cancer.

BACKGROUND: This study aimed to investigate personality traits associated with depression in breast cancer women (BCW).
METHODS: Sample: 236 BCW recently diagnosed (early stages). Tests: SASB-Structural-Analysis of Social-Behavior; IPAT-CDQ-Depression. Statistical analysis: cluster K-Means analysis to explore SASB personality-traits considering the 8 SASB clusters (Cl); CDQ scores dichotomized by 50th percentile cutoff (high/low); Pearson's chi square test to compare CDQ levels and SASB traits.
RESULTS: Cluster analysis results supported two distinguishable SASB personality traits (for all SASB Cl-Scales P < .001) classified as "Love and Autonomy" (62.2%) and "Control and Hate" (37.8%). Patients with Love/Autonomy traits are spontaneous, accept their deepest feelings and desire to be close to other people (Cl1, Cl2, Cl3, Cl4). They show a medium value of self-control and a low tendency to self-abusive and self-critical behaviors (Cl5, Cl6). They pay attention to themselves and to their needs at emotional and physical levels also if may be occasionally engaged in self-destructive behaviors (Cl7, Cl8). Women with Control/Hate traits are not spontaneous and do not always express emotions (C1, Cl2, Cl3, Cl4) and flexibility in their relationship with others (Cl5, Cl6). In stressful situations, they may ignore the option of choices for self-growth and neglect their needs and those of others (Cl7, Cl8). BCWs with Control/Hate traits scored higher in depression (P <.001) than those with the Love/Autonomy profile.
CONCLUSIONS: Healthcare professionals should be aware of these personality traits and their association with depression to identify the psychologically most vulnerable BCW and improve the care they provide them. The psychotherapeutic intervention should be planned to face on the personality problems.

Introduction

Breast cancer is one of the most common cancers in the world and the leading cause of cancer death among women in Italy. Several studies have shown that breast cancer women (BCW) are twice as depressed as the general population with a prevalence of 32%.[2,3] High rates of depression cause deep suffering and impose huge costs on patients, families and health systems. Furthermore, the depressive state is associated with a reduction in overall quality of life, with a negative impact on compliance levels with medical treatment and an increased risk of mortality.

That said, a thorough understanding of the causes of depression is a necessary step to improve symptoms and adherence to therapeutic treatments.

Personality plays an important role considering that depressive symptoms, with their associated personality traits, have deleterious effects on the patient’s psychosocial adaptation, with a considerable impact on development and progression of breast cancer.[6,7] This does not mean that it is necessarily a cause of the disease, but it can have a direct impact on the endocrine, immune and nervous systems and/or indirectly affect behaviors such as diet, exercise, sleep, smoking, and alcohol consumption.

In this regard, in a study conducted by our group, using the Structural Analysis of Social Behavior-SASB model by L.S. Benjamin, significant associations emerged between depression and some intrapsychic traits (e.g., low autonomy in making choices with poor acceptance of one’s feelings) in a postmenopausal BCW sample.

The SASB observation method allows us to grasp the person in his becoming and gives indications of the evolution of psychic structures as a consequence of interpersonal experiences and allows to describe the personality from normal to pathological. It is validated on the basis of the DSMIV and V and on the Italian population.

It is therefore a tool for analyzing intrapsychic and interpersonal behavior, useful both for the observation of interpersonal action and for the definition of how intrapsychic processes are experienced. It can also be used as a diagnostic and programming tool for interventions aimed at promoting growth and maturation and, in the case of mental illness, recovery and revitalization of intrapsychic structures.

SASB applications extend from research to practice: assessment (diagnosis), treatment of psychopathology and verification of psychotherapeutic intervention.

One of the merits of this system is to focus attention on a psychology that takes into account the totality of the person and is not limited to the description of the pathological, neglecting normal functions and interpersonal processes, which are considered fundamental from the point of view of theoretical explanation and planning and verification of the processes of change.

In the SASB Model three surfaces with four quadrants derive from the intersection of the two orthogonal dimensions (Affectivity and Interdependence) for each of the three types of focus (Proposer, Responder, Self). The meaning of the behaviors is given by the combination of the two dimensions on these surfaces as various states of the ego. “Self” corresponds to intrapsychic behaviors.

Each type of focus is described by the following dimensions: the first dimension is Affiliation-hostility (horizontal dimension), which ranges from hate to love; the second is Autonomy-interdependence-independence (enmeshment-differentiation) (vertical dimension) which ranges from control to freedom; the third dimension is the focus of the behaviors: other, self, introject- (other versus self-interpersonal behaviors).

The affiliation and autonomy dimensions are conceptually continuous, and combine to form a circumplex.

The dimensional end-points and their combinations form the 8 “clusters” of behaviors (Cl).

So, the SASB model circumplex is used to describe personality and define both interpersonal and intrapsychic behaviors, which is the goal of the current study. Cluster analysis is aimed at grouping subjects through similarities and defines personality as “an interrelated system of several traits,” exploring the organized structure of variables within the individual.

Based on this theoretical framework, the aim of this study was to explore whether different SASB personality traits (Profiles) (at intrapsychic and interpersonal levels) are present in BCW and their association with depression.

Furthermore, among the necessities in diagnosing depression is that of eliminating or substantially reducing the problems of artificial distinctions between categories and contrived comorbidities and emphasizing the distinction between episodic and chronic depressions, which is currently obscured by the balkanization of chronic depression in numerous categories and specifiers.

The SASB 8 Clusters, describe profiles of personality with different levels and types of mood disorders: the score, the description, and the connection between the SASB-8 clusters of intrapsychic behaviors allow to describe the different type and intensity of mood disorders. For the versatility of the SASB to examine interpersonal and intrapsychic behaviors of individual with depression and for its ability at detecting depressing behaviors, we have chosen to implement it in this study as a screening tool to assess personality traits associated with depression in BCW. We hypothesized the existence of distinct SASB personality traits differently associated with depressive symptoms in breast cancer population. This knowledge can suggest which psychotherapeutic intervention might be more suitable to address specific personality problems and to better cope with the disease path.

Materials and Methods

Patients, Settings, and Procedures

We aimed to study the relation between personality and depression in BCW. To achieve a power of .80 and a medium effect size, a sample of 100 was required to detect a significant model. This is a cross-sectional study.

The study sample was composed of n = 236 women recently diagnosed with breast cancer (early stages) consecutively recruited to participate in study protocol between May 2018 and 2019. All women had undergone a biopsy procedure for the histological diagnosis of cancer before the interview.

Inclusion criteria included: aged 40–70 years (adult age); being able to understand the Italian language, first-time diagnosis of breast cancer confirmed by biopsy; and giving written informed consent to participate in the study. The study was approved by the ethics committees of the INRCA-IRCCS National Institute of Science and Health for Aging and Marche Polytechnic University in Ancona, Italy (IRB approval number: CdB: SC/10/271/bis).

Patients were excluded if: they refused to participate; were unable to provide informed consent; had other forms of cancer; had psychiatric history; had a previous history of malignancy, with exception of non-melanomatous skin cancers. Age and demographic data including marital status and educational levels were collected. Two hundred and seventy patients were approached in the clinic by the physician and asked to participate in the study. All participants signed a consensus form regarding study protocol after detailed explanation by the physician at the Oncology Clinic. Only two hundred and fifty decided to participate and to fill out and sign the consent form. Fourteen patients didn’t answer all the questions in the questionnaires. It was therefore decided not to consider them for the analysis. The patients were interviewed by two psychotherapists, working in the hospital and with a year training in administration and interpretation of SASB Model, after the diagnosis by biopsy. The patients filled out all the questionnaires (which included socio-demographic and clinical variables) during the interview.

Measures

All subjects were asked to complete the following psychological and psychosocial questionnaires:

1. Social schedule including information on age, marital status (single, married, widowed, divorced) and educational level (illiterate, primary school, middle school, high school, university).

2. The SASB Intrex Questionnaire that describes the personality structure at intrapsychic and interpersonal levels (Appendix A). This test was chosen for its shortness and because it has the appropriate reliability and validity to evaluate interpersonal/intrapsychic behaviors and is validated on the basis of DSM-IV and DSM-V. Interviewed subjects had to respond to 36 items in the questionnaire describing their intrapsychic and interpersonal behaviors during the last year (e.g., “I let myself feel glad about and pleased with myself just as I am”; “I ignore and don’t bother to know my real self”; “I think up ways to hurt and destroy myself. I am my own worst enemy”). They are rated on a 10-point scale ranging from 0 (Never) to 9 (All the time). The 36 questions of Form-A are grouped by a specific score correction in 8 Cl of intrapsychic “Oneself” and interpersonal “Other” behaviors which provide an exhaustive picture of intrapsychic experience from which the interpersonal experience can inferred. Each cluster is represented on a scale ranging from a minimum of 0 to a maximum of 10.

The 8 clusters focused on intrapsychic “Oneself” and interpersonal “Other” behaviors are both complementary and opposite.

The 8 clusters of “Oneself” are the following (see Appendix A for details): SASB Cl 1 = autonomy-assertive and separating; SASB Cl 2 = autonomy and love-self-accepting and exploring; SASB Cl 3 = love-self-supporting and appreciative; SASB Cl 4 = love and control-self-care and development; SASB Cl 5 = control-self-regulating and controlling; SASB Cl 6 = control and hate-self-critical and oppressive; SASB Cl 7 = hate-self-refusing and annulling; and SASB Cl 8 = hate and autonomy-self-negligent and mentally absent.

An Italian version of the SASB Intrex Questionnaire was used for this study.

3. The Institute for Personality and Ability Testing (IPAT)—Clinical Depression Questionnaire (CDQ). This test encompasses 40 questions or statements to which respondents must give one of three possible answers or comments. Items regard concrete situations which give rise to feelings or attitudes common to everybody in certain moments of life. The CDQ is a self-reported measure designed to elicit how people think or feel at one time or another. It gives an accurate appraisal of depression level and type. The range is subdivided among: 0–3 which indicates absence or low depression; 4–7 which indicates medium and medium high level of depression; 8–10 which indicates high level of depression. The Italian validated translation of the original version was used.

Statistical Analysis

Cluster K-Means analysis was used to analyze personality SASB traits on the base of the “Affiliation & Autonomy” dimensions. Affiliation & Autonomy dimensional scores were calculated for intrapsychic and interpersonal behaviors of participants. The k-means algorithm is an iterative algorithm, that is, it repeatedly executes some of its phases and basically it can be said that it is made up of the following steps:

(1) Initialization: The input parameters are defined to run the algorithm;

(2) Assignment of the cluster: each data points is assigned to the closest cluster (or centroid);

(3) Update of the position of the centroid: it recalculates the exact point of the centroid and consequently modifies its position.

The k-means algorithm has the advantage of being quite fast, as few calculations are required and consequently little processing time to calculate the distances between the data points and the centroids at each iteration (obviously this depends on the data set and the number of clusters).

Socio-demographic characteristics of SASB personality profiles were expressed by means ± standard deviation for continuous variables and by number of cases and percentage for categorical ones. CDQ scores were dichotomized by the 50th percentile cutoff (low and high). We used this dichotomization because it was better for discriminating our sample, in accordance with the aim of the study. Pearson’s correlation coefficient was used to compare high CDQ levels and SASB personality profiles. Significance was accepted as P < .05. Statistical analysis was carried out using SPSS® version 20.0 for Windows (IBM Corporation, Armonk, NY, USA).

Results

Cluster Analysis

A total of 236 BCW participated in the study. The mean age was 55.1 (± 10.7) years. Considering the marital status, most of them were married (80.1%), whereas the remaining percentage was composed of single (9.3%), widowed (8.9%) or divorced/separated (1.7%). The educational level of the total sample included women with primary education (41.1%), high school (27.1%), middle school (22.9%), university (8.1%), or illiterate (.8%).

Using Cluster K- Mean analysis, two distinct personality profiles of BC patients were identified based on their SASB–Intrex-derived 8 SASB Cl scores. As summarized in Table 1, the largest proportion of patients (62.2%; n = 147) was classified in the “Love and Autonomy” traits. A second group, that comprised 37.8% of the sample (n = 89), was classified in “Control and Hate” traits.

Table 1.

Cluster K-Means analysis. SASB Personality Traits.

Variable	Final Cluster Centers		F	P
	Love and Autonomy n = 14762.2%	Control and Hate n = 8937.8%
SASB Cl 1	5	4	52,540	P<.001
SASB Cl 2	7	5	106,683	P<.001
SASB Cl 3	6	4	179,878	P<.001
SASB Cl 4	6	4	131,219	P<.001
SASB Cl 5	6	5	44,507	P<.001
SASB Cl 6	2	3	17,257	P<.001
SASB Cl 7	2	3	36,867	P<.001
SASB Cl 8	3	3	13,874	P<.001

Differences Between Intrapsychic and Interpersonal SASB personality Traits

Mean scores for each SASB Cl obtained for “Love and Autonomy” and “Control and Hate,” are reported in Table 1. Compared to the BCW with “Control/Hate” traits, those with “Love/Autonomy” traits reported significantly higher scores in SASB Cl 1 (F = 52,540, P < .001), SASB Cl 2 (F = 106,683, P < .001); SASB Cl 3 (F = 179,878, P < .001), SASB Cl 4 (F = 131,219, P < .001), and SASB Cl 5 (F = 44,507, P < .001) but significantly lower scores in SASB Cl 6 (F = 17,257, P < .001), SASB Cl 7 (F = 36,867, P < .001), and in SASB Cl 8 (F = 13,874, P < .001) (Table1).

Differences in Demographic Characteristics Between SASB personality Traits

The differences in patient socio-demographic characteristics between the 2 SASB Personality traits are shown in Table 2. There were no differences for some patients’ characteristics such as age, marital status and educational level between the two SASB personality traits.

Table 2.

Differences in sociodemographic characteristics between the SASB personality traits.

		Love and Autonomy n = 147	Control and Hate n = 89	P
Age (years)		55.0 ± 11.4	55.1 ± 9.6	.920
Marital status
Single		11 (7.5%)	11 (12.4%)	.487
Married		118 (80.3%)	71 (79.8%)
Widowed		15 (10.2%)	6 (6.7%)
Divorced/separated		3 (2.0%)	1 (1.1%)
Educational level
Illiterate		1 (.7%)	1 (1.1%)	.285
Primary		65 (43.5%)	33 (37.1%)
Middle school		35 (23.8%)	19 (21.3%)
High school		32 (22.5%)	31 (34.8%)
University		14 (9.5%)	5 (5.7%)

SASB Love/Autonomy Traits

The SASB Love/Autonomy personality profile includes the following traits: a low to medium aptitude to be spontaneous and autonomous (Cl1). Generally, women with these personality traits show a good acceptance (average value) of their deepest feelings (Cl2), but often do not express them spontaneously, also due to the control exercised over themselves (Cl 5). The traits of self-acceptance and self-appreciation are linked to an adequate capacity for self-esteem and self-care (Cl3, Cl4). These women exhibit an adequate level of Cl 4, which means they use energy to achieve what is needed and desired by exercising the ability to be positively self-constructing. In fact, they are able to actively develop their skills and other important qualities for personal growth: in general, these behaviors are present even if conditioned by the medium-low autonomy and the control exercised over themselves (Cl5), sometimes in a significant way. These intrapsychic behaviors, including self-esteem, could be questioned in the presence of stressful situations (Cl2, Cl8), with the consequence of ignoring the possibility of choices for personal growth (Cl8). In fact, they may occasionally adopt behavior where they neglect their choices and/or the direct expression of their own experiences and emotional needs, due to their medium-low autonomy and medium-high control.

On an interpersonal level, women with these traits may be dependent and conditioned in their relationship with others. Moreover they do not always help others by expressing trust and encouraging an independent identity (Cl1) due to their tendency to control (Cl5) and to low autonomy. BCWs may be able to be empathetic, grateful and understanding towards others (Cl2) but do not always express these feelings due to the medium-low spontaneity and autonomy (Cl1) and the control exercised over themselves and, on an interpersonal level, towards others.

Even if they wish to be attentive and close to the each other, they may incur in behavior of neglecting the option of choices for the growth of others (Cl3, Cl8): these behaviors can manifest themselves especially in the presence of stressful situations.

On an interpersonal level they occasionally express critical behaviors, blaming the other (Cl6). Considering the low scores reported in Cl7 they are rarely involved in self-destructive behaviors in the physical and emotional dimensions and rarely threaten or hurt the other (Table2).

SASB-Control and Hate Traits

Women with “Control/Hate” traits show low values of autonomy, spontaneity, self-acceptance and, on an interpersonal level, are dependent on others and do not promote the independence of others (Cl1). Furthermore, they show low appreciation towards themselves, reporting medium low capacity for self-esteem and self-care. (Cl3). This type of women also shows an average low attitude of acceptance of their deepest feelings (Cl2) and a low attitude of caring for themselves and others (Cl3). The direct expression of the deepest feelings is low and even if they can aspire to a real intimacy with others it is difficult for them to achieve it, both due to a lack of spontaneity, openness towards themselves and others (Cl4) and control (Cl5).

Infrequently they actively promote self-growth (and the growth of relationships with others) showing a poor energy to obtain what is needed and desired also in interpersonal relationships (Cl4).

They exercise medium self-control (Cl5) to achieve their objectives. A low aptitude to directly express their feelings and moods is one of the effects of this control (Cl5). On an interpersonal level, they control the other: they control what must be done and said for “the good of the person.” They in general do not express spontaneity and flexibility in the relationship with others (Cl4, Cl5, Cl6). In the presence of stressful situations, they may ignore the option of choices for self-growth and, at interpersonal levels may occasionally neglect the needs of others not supporting them in their free choices. (Cl1, Cl8). They may have difficulties in taking care of themselves and others and of their physical and emotional needs (Cl7). In fact, in the presence of stress, these patients may not always be able to support themselves in pursuing their goals as they have difficulty in taking care of their psycho-physical health. All these dimensions are linked to depression in the SASB circumplexity (Table 2).

Intrapsychic SASB personality Traits and depression

Psychometrics CDQ measures (high and low) in the different SASB personality traits are shown in Table 3. Depression levels versus SASB Love and Autonomy traits showed: 22.4% of low-CDQ and 77.6% of high-CDQ; Control and Hate SASB traits showed: 3.4% of low-CDQ and 96.6% of high-CDQ (Table 3). Compared with the Love/Autonomy traits (Table 4), the Control and Hate traits shows a significant association with depression (P < .001).

Table 3.

Associations between SASB personality traits and Depression-CDQ (low and high levels).

			SASB Traits		Total
			Love and Autonomy	Control and Hate
CDQ	Low	Number	33	3	36
		%	22,4%	3,4%	15,3%
	High	Number	114	86	200
		%	77,6%	96,6%	84,7%
All		Number	147	89	236
		%	100,0%	100,0%	100,0%

Table 4.

Chi-Square Tests. Correlation between intrapsychic/interpersonal SASB traits and depression (high and low) in BCW.

Chi-Square Tests
	Value	df	Asymp. Sig. (2-sided)	Exact Sig. (2-sided)	Exact Sig. (1-sided)
Pearson Chi-Square	15,609 a	1	,000
Continuity Correction b	14,168	1	,000
Likelihood Ratio	18,786	1	,000
Fisher’s Exact Test				,000	,000
Linear-by-Linear Association	15,542	1	,000
N of Valid Cases	236

a0 cells (0,0%) have expected count less than 5. The minimum expected count is 13,58.

bComputed only for a 2 × 2 table.

Discussion

The key findings of the present study were the two SASB Profiles indicating structured personality traits that account for readily discernible patterns in their intrapsychic/interpersonal behaviors experienced during the last year. The description of SASB profiles emerged from the description of intrapsychic behaviors in the last year by the BCW: it indicates that the emerging profiles do not concern temporary behaviors associated with serious diagnosis but long term personality traits.

The present pattern of results adds to the current literature in an important way because cluster K-Means analysis made it possible to identify two different personality traits (Love/Autonomy vs Control/Hate) distinguishable in adaptive or maladaptive traits, showing a different impact on the ability to deal with the condition that the tumor creates in a person’s life. Control/Hate personality traits may be indicative of a personality with intrapsychic and interpersonal problematic behaviors, and a tendency to be depressed.

Moreover, to the best of our knowledge, this is the first study on women with breast cancer, which uses the SASB model to examine personality traits in relation to depression.

At this point, we can make some considerations.

Problematic behaviors such as the depressive state linked to intrapsychic behaviors of neglect of one’s own needs on an emotional and physical level and low self-affirmation and autonomy, shown by women with Control/Hate traits, can hinder disease prevention and self-care behaviors. The depressive state contributes and is part of this intrapsychic behavior of neglect of one’s own needs on an emotional and physical level. As a second consideration, in agreement with a study by Vespa et al, we believe that BCW with Control and Hate behaviors can have more difficulty to cope with diagnosis and disease, manifesting behaviors of self-neglect both in the physical and emotional dimensions.

These women, in fact, may show personality traits characterized by difficulties in taking responsibility for their actions and consequences, not being aware of their role in determining the circumstances and acting directly on the various elements. Due to their low autonomy and self-affirmation (Cl1) they have difficulty making free choices based on their needs both emotionally and practically.

For these considerations, in line with Lemogne et al who observed an association between personality and prevention-oriented behaviors in BCW (i.e. screening adherence, mammography use etc.), we believe that Control–Hate type of personality, which emerge in the present study, may encourage non-adherence to prevention behaviors, and consequently increase the risk of cancer.

Moreover Cerezo affirmed that personality traits could affect the psychological adjustment of breast cancer survivors.

Conversely, women with love and autonomy traits exhibit attention-to-care behaviors that may resemble the personality dimension of conscientiousness of the study conducted by Connor-Smith and Flachsbart, which can predict problem-solving and emotional-cognitive restructuring skills.

Women with Love-Autonomy have some personality traits such as good levels of self-confidence, self-esteem, and of acceptance of their own emotions, that are generally connected with ability to effectively deal with a cancer diagnosis and associated treatments. In fact, they are less likely to neglect themselves and are more prone to develop their potentialities and capacities. Therefore, these women are more able to achieve emotional and psychic equilibrium, also through the difficulties of life (stressful events) and reconsolidate themselves after crises, because of their ability of being in touch and aware of their emotions and feelings. We agree with Xunlin who affirms that self-awareness is a function of coping skills with stressful situations such as the threat posed by the onset of a tumor. Moreover, our findings showed that women with Control and Hate personality are more susceptible to experience depression compared to women with Love and Autonomy traits. We can assume that the results of the current study are similar in this aspect to a case-control analysis by Vespa et al previously conducted by our study group, that showed significant associations between some SASB traits and depression in a group of postmenopausal BCW. In particular, we observed that patients, who are self-critical and oppressive towards themselves and with low acceptance of their own emotions, are also more depressed.

Furthermore, in the present study a high percentage of depression is present in both SASB personality traits. These results are in agreement with Purkayastha et al and Civolotti et al who suggest that the period after diagnosis is particularly difficult for all these patients (all subjects enrolled were recently diagnosed with early stages of breast cancer). However, Love/Autonomy women were more able to deal with and overcome this depression than patients with a Control and Hate profile, as the described intrapsychic and interpersonal traits indicate greater ability for adaptive behavior.

In addition, while in the Love/Autonomy personality traits it can be assumed that depression can be a reaction to stressful events (onset of the disease, restructuring of life to follow medical therapy), in the Control/Hate personality traits it can be assumed that these subjects were predisposed to depression (or already depressed) even before the onset of the disease, as the description of their corresponding intrapsychic behaviors during the year before the diagnosis can point out.

Oh et al. reported that depression can also be associated with the difficulty these women have in expressing their emotions and needs and in being in deep contact with others (interpersonal behaviors) and therefore not obtaining the help and emotional support they need, unlike patients with Love/Autonomy traits. Emotional expression is usually helpful because it gives the person an outlet for his/her own feelings, and an opportunity to get better emotional support.[22-24]

The interpersonal Control/Hate traits, that emerged from the present study may confirm this consideration and may suggest a need of closer relationships. Therefore, it is possible to affirm these BCW may not obtain the desired emotional interpersonal support.

Our study had several limitations. First, all the subjects are adult BCW, and the results may not be extrapolated to other diseases or to patients in different age groups (younger or older). Second, a sampling bias is present in the data because all the subjects attended two institutions in the same city and thus are not representative of the BCW population.

Third, our results provide a snapshot of depression associated with intrapsychic behaviors after cancer diagnosis but not during the treatment phase. The depression symptoms may differ during the treatment phase or at other points in the cancer journey. Future longitudinal studies could make these comparisons and test the evolution of depression symptoms and the correlation with personality traits.

Despite the limitations, our findings suggest that more awareness of these personality characteristics and their association with depression in BCW is needed for the following reason: Knowledge of intrapsychic and interpersonal traits, through a personality screening, within standard time periods, may be a marker of patients with a bad adaptation to cancer treatment. Our findings are of clinical and practical importance because knowledge of the differences in intrapsychic and interpersonal personality traits, that may contribute to the onset of depression in breast cancer patients, could provide information on women most at risk for depression, as well as provide guidance for more targeted interventions. In fact once the significant problematic intrapsychic behaviors have been detected, specific psychotherapeutic interventions may be required in patients with Control and Hate traits, such as Interpersonal Reconstructive Therapy,[25,26] in order to facilitate contact, processing and integration of emotional experiences and intrapsychic conflict and to welcome one’s feelings so that the patient becomes able to draw on the resources necessary for a successful satisfaction of the deepest needs and a good adaptation to the condition of illness.

An integrated holistic psychotherapy (for example, with mindfulness—based interventions) could instead be more desirable for women with traits of Love and Autonomy in order to acquire a better awareness and use of the available resources (internal and external).

Conclusion

In conclusion, although the questionnaire chosen to measure personality is not in standard use, we believe that the use of the SASB model for the personality assessment in this oncology population can help clinicians make useful predictions about the patient’s personality (at intrapsychic and interpersonal levels) and would allow a more timely start of integrative, personality-based treatments. Understanding potential mechanisms through which personality influences depression levels in breast cancer population can help the development of more targeted interventions to treat depression.