The results of the present study showed that 23.0% of women had a pregnancy or pregnancies during chemotherapy or radiotherapy and up to one year after the last session of treatment. In terms of the pregnancy outcomes, 55.0% of pregnancies ended in abortion, and about 45% were live birth. However, Shabazin and Gholamy (
27) believed that the actual prevalence of unwanted pregnancy in Iran may be higher than the reported rates, because in the Iranian society, some women tend to hide their unwanted pregnancy from others, which makes it difficult to collect accurate information.
Moreover, the rate of pregnancy in the current study was considerably higher than previous studies. A study by Mody et al. (
28) in the US showed that 71% of women did not report pregnancy during their primary cancer treatment, while they were sexually active. Another study based on data from the Basel Breast Cancer Database showed that the rate of unintended pregnancy was only 3.5% (
8). Moreover, a study by Kopeika et al. (
29) on young female breast cancer survivors (with the median time of six years from the time of diagnosis) in the UK found unintended pregnancies in only 7.0% of women, 58% of which were terminated, and around 2.0% were live births.
In terms of the contraceptive use, although nearly 90.0% of women reported using a contraceptive method, only 67.0% used safe methods (condoms and pills), and 23.0% used the withdrawal method, which is not a safe method; also, about 11.0% of women did not use any methods. The withdrawal method, if used carefully, can be as effective as most non-hormonal barrier methods. Only 4% of women using this method are expected to experience an unintended pregnancy within the first year of use; however, due to the high user error, the rate of unintended pregnancy among users is 27% in the first year (
30). Moreover, the withdrawal method, as shown by Bommaraju (
31), is not effective, because it is prone to user error and does not allow for female reproductive control. Therefore, it can be said that a considerable percentage of women are at risk of unintended pregnancy.
Moreover, a significant proportion of women (37%) were not familiar with emergency contraception. Similarly, Mody et al. (
28) in the US reported that 90% of women with cancer used a form of contraceptive in, and the most common method was condom (52%). However, study by Guth et al. (
8) also reported that 58% of women with breast cancer used ineffective contraceptive method.
Regarding the determinants of pregnancy among women, the results showed a significant relationship between age and the incidence of pregnancy, and the highest pregnancy rate was reported in women aged 15 - 24 years. It is clear that younger women have not reached their ideal number of children, compared to older women; therefore, the rate of precedency is higher among younger women, which is consistent with another study in Sistan and Baluchestan (
32). The current findings also revealed that occupational status is one of the predictors of pregnancy. In other words, the proportion of housewives who became pregnant during treatment was significantly higher than employed women. This may be due to the fact that the desired number of children is lower in employed women; their authority in the family is higher; and they have more exposure to information about contraceptives and complications of pregnancy during treatment (
26,
32).
Ethnicity is a cultural variable, which has a significant relationship with fertility. In this study, most pregnancies were reported in Baluch women. This finding is consistent with the study in Sistan and Baluchestan, which found a significant relationship between ethnicity and fertility behavior (
32). On the other hand, Asadisarvestani (
32) found no significant relationship between ethnicity and fertility behavior in Shiraz County. It was concluded that other social, economic, and cultural factors can undermine the role of ethnicity (
26). It seems that the higher fertility rate in Baluch women versus Persian women is due to the impact of variables, such as higher childbearing value, less education, and lower employment rates, affecting fertility behavior and ideals in a certain way.
Physician consultation was one of the predictors of pregnancy. A significantly lower rate of pregnancy was found in women who received advice from their physician about contraception. Moreover, the results showed that half of the respondents claimed that their doctor did not discuss contraception. It is believed that contraceptive counseling by physicians made the patients more likely to use contraception, compared to patients who received no counseling (
18). Previous studies have also revealed that 10% - 65% of reproductive-age survivors received contraceptive counseling after their cancer diagnosis (
16,
18,
19). Some women might have forgotten the received advice about contraception but it should be accepted that a set of complex variables can affect the quality of counseling. More explanation, the limited number of medical centers and specialists in Zahedan has led to overcrowding; therefore, doctors may pay less attention to consultation about reproductive health issues.
Cultural factors also play an important role. Contraception conversations may be unlikely in clinic rooms, as providers focus on cancer treatment plans and outcomes, and patients may be uncomfortable initiating questions or may be unaware of the need to discuss their concerns with the doctors. Physicians may not clearly explain the issue to patients due to cultural restrictions. The discomfort surrounding contraception is exacerbated if family members are present and the provider is of the opposite gender (
18,
33,
34). In addition, since a considerable number of women have low levels of education, they may not accurately understand their physician’s advice regarding pregnancy and contraception.
A study by Crafton (
35) showed that only 57% of gynecologic oncologists believed that their patients understood the possibility of unplanned pregnancy during treatment. Research to date suggests that cancer survivors do not receive adequate counseling about safe and effective contraceptives during or after cancer treatment (
16,
31,
36). Oncologists should advise patients on the contraceptive methods and the risk of pregnancy before starting treatment until they have achieved good health. The contraceptive efficacy and the adverse effects of each method should be discussed in relation to cancer diagnosis and treatment, as some drug interactions may lower the contraceptive efficacy (
36,
37). It is suggested that oncologists refer patients of reproductive age to gynecologists to ensure proper contraceptive counseling (
8,
16).
While 90% of women in the present study were close to the health centers (< 30 minutes), the findings showed that a considerable percentage of women purchased contraceptives from pharmacies, while pharmacies, in most cases, did not provide enough information about the contraceptives; this could affect their knowledge of contraceptives, and consequently, lead to a higher rate of failure. Therefore, family planning service providers and physicians need to pay more attention to the delivery of adequate and accurate information about contraceptives to improve the rate of contraceptive use and reduce pregnancy in this group of women, particularly with attention to this fact that the desired number of children was above two in 86.0% of participants in this study, and nearly 50% of them planned on becoming pregnant in the future. The findings of a study by Kopeika et al. (
29) in the UK also found that 41% of young breast cancer survivors showed tendency to have children. Similarly, a study by in Beirut, Lebanon, revealed that 30.76% of women wanted more children at the time of diagnosis (
38).
It should be noted that contraceptive counseling is not only necessary for women, but is also essential for their husbands, as they play an important role in their partners’ reproductive choices and behaviors. This issue is especially important, as the present findings revealed that important decisions in the family are made by men and that their education level is one of the main predictors of pregnancy during treatment; nevertheless, the education level of 40.0% of men was low in this study, and a considerable number of them desired more children that their wives. In other words, 34% of husbands did not agree with their wives about the number of children, and 17% disagreed about contraception; couple’s agreement on the number of children was one of the main predictors of pregnancy.
Major efforts are needed to increase the spouses’ awareness of the risk of pregnancy during cancer treatment and the importance of contraception (
32,
39), because if couples agree on the number of desired children, their agreement about other issues, such as the interval between childbirth and contraceptive use, is greater. These findings are consistent with the results of other studies, which found that men played an important role in women’s ability to make fertility-related decisions (
32,
39-
43).
In sum, contrary to the common belief that women with cancer are less likely to become pregnant, physicians and family planners should pay more attention to fertility preferences to provide the necessary information for their patients. According to Maslow et al., counseling recommendations for contraceptive use during treatment, besides addressing abstinence and safer sex practices, enable patients to feel more confident in their relationships, help them better express their sexual desires and preferences, and promote their awareness about the risks of unprotected sex (
43).
Furthermore, considering the important role of demographic, cultural, and social variables in the incidence of pregnancy during treatment, physicians must pay more attention to the role of these factors to reduce the pregnancy rate and its consequences. Also, due to the widespread presence of health centers in different areas, it can be effective to refer patients along with their spouses to these centers to receive the services and information needed in the field of family planning. Since few studies have been conducted on reproductive health and family planning among women with cancer, it is recommended to conduct similar studies in other regions, especially in areas where the fertility and unintended pregnancy rates are higher.
5.1. Strengths and Limitations
The main strength of this study was its attention to socio-economic factors in addition to the role of accessibilities and structural factors. Furthermore, to the best of our knowledge, this study is the first study on this topic in Iran.
In terms of limitations, the main limitation of this study was its method. More explanation, the method of this study was quantitative, while the mixed method study can bring more depth knowledge. Moreover, the population of this study was limited to Sistan and Baluchestan Province.
5.2. Conclusions
Despite many advances in family planning in Iran, similar to many countries, the rate of unintended pregnancy is high in Iran, especially in areas with a lower socioeconomic status. Women with cancer are a vulnerable group in the community. Contrary to our expectations, not all pregnancies that occurred during the treatment period were unintended, which indicates the shortcomings of family planning programs, such as inadequate attention to vulnerable groups for family planning services and lack of proper communication between medical centers, family planning centers, and couples. Therefore, reducing the rate of pregnancy and its complications among women with cancer depends on multiple factors, such as improving the educational programs and enhancing the relationship between medical centers, family planning centers, and couples. However, this goal cannot be achieved without scientific and accurate knowledge of demographic, social, and cultural characteristics and other influential factors.