Review Article
Spousal Cancer: A Systematic Review and Case Report of a Metachronous Presentation of Breast Cancer in a Genetically Unrelated Couple
Anikó Kovács1*, Toshima Z Parris2 and Barbro Linderholm3
1Department of Clinical Pathology and Genetics, Sahlgrenska University Hospital, Sweden
2Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Cancer Center, Sahlgrenska Academy at University of Gothenburg, Sweden
3Department of Oncology, Sahlgrenska University Hospital, Sweden
*Corresponding author: Anikó Kovács, Department of Clinical Pathology and Genetics, Sahlgrenska University Hospital, Sweden
Published: 10 Oct, 2017
Cite this article as: Kovács A, Parris TZ, Linderholm B.
Spousal Cancer: A Systematic Review
and Case Report of a Metachronous
Presentation of Breast Cancer in a
Genetically Unrelated Couple. Clin
Oncol. 2017; 2: 1352.
Abstract
We present a systematic review of the literature about spousal cancer, concerning the possible
cancer aetiology of synchronous and metachronous, concordant and discordant cancer types in
married couples. Synchronous and metachronous breast cancer in spouses are extremely rare. We
present here a married couple whom were diagnosed with metachronous breast cancer, with a 10-
year delay in onset in the husband. This case of spousal breast cancer may represent a coincidental
phenomenon, as breast cancer is quite uncommon in men. It has been postulated that exposure to
viral, nutritional and environmental / contamination factors for extended periods of time might
facilitate cancer development in the same organ in spouses. However, current cancer incidence rates
among cohabitants are relatively low.
Keywords: Spousal cancer; Connubial cancer; Epidemiology; Spouses; Married couples; Breast
cancer
Introduction
Synchronous and metachronous tumour presentation in married couples is rare, particularly if the tumours originate in the same organ. As male breast cancer is a rare condition, few spousal breast cancer cases have been reported. Married couples frequently have similar socioeconomic backgrounds, ethnic roots, diets and environments, which might facilitate the development of malignant tumours of similar origin in both spouses. Previous studies have provided conflicting results concerning cancer risk in the spouse of a cancer patient. However, spousal aggregation of cancer might provide clues to unsuspected aetiological factors. Incidences rates for cancer among cohabitants is expected to rise, due to the increase in life expectancy and the steady increase in cancer incidence rates in the general population.
Material and Methods
Clinical and histopathological description of the wife’s bilateral breast tumours: The female
patient was 59 years of age when she was diagnosed with a self-detected breast cancer. Mammography
screening identified a 40 x 25 mm large suspected malignancy in the upper lateral quadrant of
the right breast, 1 cm from the nipple. Total mastectomy was performed with axillary dissection.
Histopathological examination revealed a 36 mm large invasive ductal carcinoma, Bloom–
Richardson–Elston grading score 7, grade 2. The tumour expressed oestrogen and progesterone
receptor (90% respectively 60%). Ki-67 proliferation marker showed 40% positivity and HercepTest
was negative (score 0).No metastases were found in 14 axillary lymph nodes. The patient received
adjuvant endocrine therapy with an aromatise inhibitor during a five-year period. Two years later,
a 5 mm large area with micro calcification was identified medially in the left breast, 7 cm from the
nipple. Partial mastectomy was performed and histological examination revealed an 8 mm large
ductal carcinoma in situ grade 3. Axillary dissection was not performed. The patient received postoperative
breast radiotherapy with a total dose of 50 Gy. No local or distant relapse was diagnosed at
her last hospital visit after 8.5 years of follow-up. The patient has no relatives with breast or ovarian
cancer.
Clinical and histopathological description of the husband’s breast tumour: The 67-year-old
male patient presented with a retromamillary located, ulcerated, 36
mm large mass in his left breast. Physical examination found enlarged
axillary lymph nodes. A total mastectomy was performed with total
axillary dissection. Pathological examination of the specimen revealed
a 50 mm large invasive ductal carcinoma in the left breast with BREscore
9, grade 3. Subsequent immunohistochemical examination
of the tumour showed positivity for oestrogen and progesterone
receptor (95% respectively 90%). Ki-67 proliferation marker was
stained in 60% of the tumour cells. HercepTest showed membranous
staining score 2+ and SISH (silver in situ hybridization) test revealed
amplification of the HER2/neu gene. Metastasis of breast cancer was
found in 19 of 27 axillary lymph nodes. The patient received adjuvant
treatment with anthracycline-taxane based chemotherapy, one year
of trastuzumab, loco regional radiotherapy and endocrine treatment
planned for five years. He has no family history of breast cancer. Both
patients’ material was stripped of direct subject identifiers.
Table 1
Results
Here, we report a case of metachronous spousal breast cancer in a long-standing, but childless married couple of 29 years. Due to nulliparity, the wife had an increased risk of developing breast cancer because she had neither given birth, nor breastfed any children. She developed bilateral breast cancer within a 2-year time span. Ten years later, the husband developed breast cancer with a more aggressive breast cancer subtype: grade 3, 50 mm large, HER2-positive, invasive ductal carcinoma with several axillary lymph node metastases. There were no known familial cases of cancer for either spouse, and so, their identical but metachronous breast cancer occurrence can be explained as coincidental. Both male breast cancer and this type of marital malignant comorbidity are extremely rare and the occurrence of metachronous tumours in spouses is exceptional, though having most likely occurred by chance. Due to the low prevalence of spousal breast cancer, the aetiological factors are still open to conjecture.
Discussion
The available cancer epidemiology data for spouses are relatively
few and show infrequent occurrence of malignant tumours of the
same site and type affectingnonconsanguineous couples. One could
expect that shared lifestyle including diet, smoking and drinking
habits, as well as, viral infection might be associated with increased
cancer incidence rates among spouses. Studies reporting cases of
spousal cancer are summarized in Table 1, which includes both large
studies and cases reports.
Few studies have beenconductedto evaluate spousal breast cancer
epidemiology or connubial cancer with breast cancer in one spouse.
No cancer type in one spouse was found to predispose breast cancer
development in the other, and vice versa. In alarge, populationbased
cohort in Sweden [1], all first-degree relatives and wives were
investigated, of 153 men who were diagnosed with male breast cancer
from 1965 to 1989. There was no significant increase in breast cancer
incidence in the wives. Namely, the wives of male breast cancer
patients had similar cancer incidence as the general population. These
results suggested that shared lifestyle in adulthood did not greatly
increase the overall risk of breast cancer and were in accordance
with an Italian study conducted between 1991 and 1994 [2]. In a
large-scale Swedish study, covering 10.2 million individuals and
over one million tumours, a total of 71,020 couples presented with a
concordant or discordant cancer after age 50 years. Among them, 33
couples had concordant breast cancer, which is thus far the highest
number of the reported concordant spousal breast cancer cases [3].
The study concluded that no excess cancer risk was found among
spouses, which could not be explained by known risk factors. Only
the association between gastric and pancreatic cancers represented an
exception. In 2008, a Swedish study including over 2 million couples
confirmed that lifestyle shared by married couples played a minor role
in cancer causation [4]. Only strong environmental risk factors such
as smoking seemed to influence cancer development in adulthood,
including lung, upper aero digestive tract and oesophageal cancers.
Conflicting results have been reported about risk of spousal cancer
in the gastrointestinal tract. In a study conducted between 1951 and
1977, Jensen and colleagues showed that the risk of colorectal cancer
and other possibly aetiologically-related diseases was no higher in
the spouses than in the matched population [5]. Similar results were
shown in a Danish study, where 8,095 spouses of colorectal cancer
patients were studied who had no excess risk neither for colorectal
cancer nor for other types of cancer, including breast cancer [6].
In contrast, a Swedish study analysing approximately 700,000
spousal cases showed a significant increase in risk for oesophageal,
stomach, colorectal, lung, bladder and skin cancer and melanoma
but not for breast cancer among cohabitants [7]. After screening
25,670 married couples with up to 31 years follow-up, an American
study showed that concordant spousal cancer occurred relatively
infrequently, with only 834 couples both having cancer and only
one couple had concordant breast cancer. The study only found
statistically significant husband-wife associations for cancer of the
tongue and stomach and for non-Hodgkin lymphoma [8]. In the
case of spousal stomach cancer, Helicobacter pylori can emerge as
an aetiological factor, whereas chemical and viral agents can play a
pivotal role in the emergence of marital non-Hodgkin lymphoma
[9,10]. Non-significant, but mildly elevated risk ratios were noted for
non-Hodgkin lymphoma and for cancers of the mouth and pharynx,
lung, bladder and breast. Although the risk ratio for colon cancer and
colon and rectal cancer combined was low for 11 couples concordant
for cancer of the colon. Examined site distribution of cancer-related
deaths in husband-wife pairs and identified 51 couples with cancerrelated
deaths of various sites, but not breast cancer [11]. In addition,
the authors established that the husband-wife pairings showed
excessive cancer-related deaths suggesting common environment
to be a plausible explanation for this type of aggregation of cancer.
Reported three connubial malignant melanoma cases, but fair skin
in all six patients and probably common habit of sun exposure were
concluded to be more likely risk factors than common environment
[12].
Viral aetiology of different spousal cancers has been debated,
primarily in genital cancers and lymphoproliferative malignancies.
The role of viral agents in breast cancer development has also been
postulated. One study confirmed the presence of mouse mammary
tumour virus (MMTV)-like DNA sequences in breast carcinomas of
three family members including the husband, wife and their daughter,
where first the husband was diagnosed with breast cancer and then
six years later both his wife and daughter developed breast cancer
[13]. However, MMTV as a common aetiological factor in breast
cancer development has not been widely investigated or reported
in the literature. If an infectious viral agent were to play a role in
breast cancer emergence, the prevalence of male breast carcinoma
cases would be expected to increase with the increasing breast cancer
incidence in females.
Increasing evidence has emerged connecting viruses, in
particular human Papilloma virus (HPV), as an aetiological factor
for spousal genital cancer. Martinez examined the wives of 889
husbands with penile cancer and showed a substantial increase in
incidence of squamous cell carcinoma of the cervix compared to the
control group [14]. The wives (n = 29) of penile cancer patients had
various cancer types, among which 28% (n = 8) had cervix cancer
where the aetiological role of HPV can be considered. On the other
hand, a relatively early Swedish study conducted between 1958 and
1982, at a time when viral aetiology of cervical and penile cancer
was still not widely accepted, could not showan association between
the occurrence of penile cancer in men and cervical cancer in their
sexual partners, compared with the control group [15]. Namely,
examining 1,064 men with penile cancer, they found only eight
wives with cervical and one with vulvar cancer, whose cancers could
be related to sexually transmitted HPV infection. It is interesting to
mention that there were 12 wives in this study, who were diagnosed
with gynaecological malignant tumours (five with endometrial and
seven with ovarian carcinoma), not related to viral aetiology. Similar
results were found in a Finnish study, where only two wives of 279
patients with squamous cell carcinoma of the penis were found to
have cervix carcinoma. The authors concluded that the low incidence
rates of both cancers might mean that transmission of the disease was
an unusual event in the studied cohort of patients and some HPV
types infecting the genital tract are known to have very low or no
malignant potential. The low infectivity of HPV virus can refer to
a multifactorial aetiology, and even individual immune protection/
immune responses may play a role in tumour prevention.
There is an increased morbidity in patients with prostate
adenocarcinomas. published an epidemiological study about
widowers with prostate cancer, which indicated no tendency of men
with a high prostate cancer risk to marry women with a high risk
of breast, endometrial, cervical, ovarian, or other cancer [16]. If we
suppose that couples had been exposed to a common carcinogenic
agent during marriage, a clustering in time of disease onset could
have been expected. Reported 230 husband-wife pairs with malignant
tumours. Because of the high cancer incidence rates in the wives,
the authors recommended that the wife should be screened for lung,
breast, and gynaecological cancers if the husband was diagnosed with
cancer [17], also found a potentially higher risk of cancer among
spouses of cancer patients. The authors postulated that if one of
the spouses was diagnosed with a malignant tumour, it might instil
better awareness of health issues and consequently an earlier cancer
diagnosis in the other spouse.
Although case reports have been published from various
populations around the world, no geographical predisposition was
noted in the literature.
Statistical evaluation of connubial cancer occurrence can become
more difficult in modern times because of changed marital habits, as
many tend to marry more than once during their lifetime. Moreover,
the number of cohabitations without official marriage is increasing,
which makes searching for spousal cancers in marriage registries
more difficult.
The low prevalence of comorbidity among spousal cancer
patients may confirm that nutrition and environmental factors only
in combination with genetic and epigenetic causes may provoke
tumour formation in both partners. This postulation is supported
by the evident frequent occurrence of family cancer syndrome,
where malignant tumours are detected non-simultaneously in
family members whom are genetically related to one another. Taken
together, genetic characteristics might contribute to the development
of multiple primary malignancies in family members.
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