Background: Patients with Multiple-primary Malignancies are usually excluded from clinical trials. Clinical information re-distribution, associations, response to treatment and prognosis are scared. Collecting information will help us to expect the impact of prior therapies and to teach us how to best treat them. This study aims to report cases in our society and to see if we have a special predilection of certain Multiple-primary Malignancies in our region based on different geographic and environmental risk factors. Our retrospective study aims to collect these cases and follow their prognosis and treatment response as well as looking for any relation to cancer therapy.
Methods: A retrospective study included patients who have two or more histologically diverse primary malignancy, either as synchronous or metachronous malignancy. The study was conducted in King Abdullah Medical City, Saudi Arabia over 7 years period from 2012 to 2019. We collected all patient’s clinicopathological information, treatment, and modalities.
Results: We collected 53 cases of multiple primary malignancies 26were synchronous (48%) and 27 were metachronous (52%). Out of 53 patients, 29 (60 %) were females and 14 (40 %) were males. The most common sites for synchronous are breast and endometrial cancer. Curative treatment could be offered in 19 patients (73%). For metachronous tumours, the most common primary tumour was breast cancer, while the most common second malignancy was colorectal cancer. Curative treatment could be offered in 15 patients (53%).
Conclusion: Multiple primary malignancies represent a small proportion of our cases, with no special predilection in our society. Multiple primary malignancies did not signify a poor prognosis; besides nonmetastatic cases showed a good response to therapy. We should not forget the possibility of a second primary tumour as these cases can be reasonably treated with curative intent. 



Multiple-primary cancers are defined as primary malignant tumours of different histological origins in a single patient. Recently, there has been an increase in the number of patients diagnosed with multiple-primary cancers; attributed to improved diagnostic techniques and prolonged life span of patients with malignancy. Now we are aware that most multiple primary cancers are double primary cancers [1][2][3].

The incidence of Multiple-Primary Malignancies has been common among cancer patients [4]. One of the earliest statistical analyses of Double-Primary Malignancies was carried out by Bugher in 1934, he derived an equation for the probability of death from cancer during a specified period of age with a coincidental Second Malignancy [5]. According to the definition used, the overall reported frequency of Multiple-Primary Cancers ranges from 2% to17% [6].

The criteria used for the diagnosis of Double-Primary malignancies has been primarily given by Warren and Gates [7]. While, the two most commonly used definitions were provided by the SEER Program (Surveillance, Epidemiology, and End Results) and the IACR/IARC (International Association of Cancer Registries and International Agency for Research on Cancer) [8]. The SEER database considers single tumours at different sites in the same organ (e.g., colon) as multiple sites. The IACR/IARC rules are more limited; only one tumour is recorded for an organ, regardless of time, unless there are histologic differences. Additionally, The SEER database advocates the use of a 2-month period to distinguish between Synchronous and Metachronous Multiple- Primaries, whereas IARC recommends a 6-month period [9-10].

The theory regarding the origin of the majority of Multiple-Primary cancers is that they arise due to random chance, but different mechanisms have been suggested to be involved in Multiple-Primary Cancers, such as the family history, immunologic, genetic defects, exposure to carcinogens, radiation, chemotherapy, and field cancerization [11].

Germline mutations in mismatch repair genes can produce susceptibility to cancers of the colorectum, ovary, stomach, small bowel, upper uroepithelial tract, hepatobiliary tract, and brain. Li-Fraumeni syndrome (LFS), an autosomal- dominant disorder, features the occurrence of breast cancer in young women and of soft tissue sarcomas, osteosarcomas, brain tumours, acute leukaemia, and adrenocortical tumours in children and young adults [12]. Germline mutations in the p53 tumour suppressor gene (also known as TP53) have been identified in approximately one-half of LFS families in the literature [13] and cigarette smoking that affects the risk of several cancer types.

All the information about double malignancy came from case reports with very few centers reporting their experience and none from our region. We needed to collect our experience in treating those cases. Collecting information will aid us in expecting the impact of prior therapies and teach us how to best treat them.

This is a retrospective study with a single medical facility’s experience with Multiple-Primary cancer cases. This study aims to report cases of Double-Primary Malignancy in our society and see if we have a special predilection of certain Double-Primary cancers based on different geographic and environmental risk factors.

Materials and Methods

This was a retrospective observational study carried out at King Abdullah Medical City, Makkah, Saudi Arabia, from January 2012 to December 2019. All Patients with malignant tumors of different histological origins were defines as histologically confirmed Multiple-Primary Malignancy cases. Patients were identified through a retrospective review of medical records excluding patients with insufficient histopathological data.

The data collected were the patients’ characteristics, pathological data, and outcome information. Moreover, this research protocol was approved by the Institutional Review Board Committee. Since the study performed is retrospective, we obtained a waiver of informed consent from IRB.


We collected 53 cases of Multiple-Primary malignancies 26 were synchronous (48%) and 27 were metachronous (52%). Out of 53 patients, 29 (60 %) were females and 14 (40 %) were males.

The most common sites for synchronous, Table 1, are breast and endometrial cancer. Metastasis at diagnosis was present in 7 patients (23%). The median age of diagnosis for synchronous tumours was 61 years (range: 27 to 83 years), 4 patients were male (26%). CT scan for staging workup resulted in the detection of a second tumour in 21 patients 5 patients of which was diagnosed during pathological examination. Curative treatment could be offered in 19 patients (73%).

Age At diagnosis sex Primary Secondary Detected by Treatment Metastasis at presentation State of last follow up Outcome /duration from diagnosis to death
79 F Stage II breast cancer invasiveductal cancer (IDC) Stage IV ovarian serous cancer CT scan Mastectomyand chemotherapy carboplatin/ Paclitaxel yes dead Refused surgery for the ovary then received paclitaxel weekly then palliative care
68 F Right breast IDC 11/2017 Stage IIIC high grade serous cancer CT scan TAH &BSOOmentectomy. Adjuvant Carbo/ paclitaxelNo surgery for breast No Alive Under follow up
61 F Right breast IDC stage IIIB Stage IIA colon cancer CT scan BCS ALNDChemotherapy FEC/ Docetaxel Sigmoidectomy letrozole No free Under follow up
44 F Right breast cancer IDC Appendicular mucinous adenocarcinoma stage IV CT scan MRM tamoxifen yes dead 5 months
52 F Left breast stage IIIA IDC Stage IA endometrioid adenocarcinoma of the uterus CT scan TAH& BSO omentectomy PLND Left MRM Chemotherapy FEC/docetaxel Radiotherapy Letrozole No free Positive family history of ovarian cancer BRCA mutation positive Under follow-up
63 F Breast IDC Endometrial endometrioid adenocarcinoma CT scan Neoadjuvant with dual anti-HER 2 therapy. Followed by surgery for both No Alive The patent currently under adjuvant therapy
63 F Triple negative left breast IDC Hormone receptor positive right breast cancer Path exam Neoadjuvant AC/ docetaxel Bilateral MRM No Alive Currently under adjuvanthormonal therapy
65 F Right breast IDC Stage IV Rectal adenocarcinoma CT scan Right MRM Chemotherapy for rectal cancer yes Yes liver Still under chemotherapy
75 F Stage IVB endometrioid adenocarcinoma Stage I mucinous carcinoma of the breast CT scan Carboplatin paclitaxel. But Refused surgery yes Dead Refused surgery for the endometrium after very good response to chemotherapy
49 F Stage IA endometrial endometrioid adenocarcinoma Stage IA mucinous borderline tumour Path exam TAH &BSOinfracolic omentectomy No free Under follow up
36 F Stage IA endometrial adenosequamus cancer Papillary thyroid cancer CT scan TAH &BSOTotal thyroidectomy No free Underfollow up
64* F Stage IA endometrial endometrioid adenocarcinoma NSCLCstage T1bN0 Cancer rectum CT scan TAH &BSOOmentectomy+ Choleycystectomy Right lung lobectomy and hilar lymphnode excision LAR No free Under follow up
56 F Stage I Uterine leiomyosarcoma Stage IA Ovarian endometrioid borderline tumour Path exam TAH &BSOOmentectomy 7/2018 No alive Under follow up
72 F Stage IA carcinosarcoma of the uterus Stage I mucinous carcinoma of the breast CT scan TAH &BSOFollowed by Adjuvant carboplatin/paclitaxel,Radiotherapy External pelvicRight MRM Adjuvant Letrozole No free Relapsed 6 years later with metastatic carcinosarcoma shifted to palliative care after two cycles of chemotherapy
27 F Left foot leiomyosarcoma thymoma CT scan Surgery for both No free Under follow up
39 F Low grade brain glioma large infiltrative mass Abdominal mass GIST CT scan Bilateral V/P shunt No dead 21 months
78 M Stage IV nasopharyngeal cancer undifferentiated Hepatocellular carcinoma Cirrhosis, LCF CT scan Radiotherapy incomplete course yes dead 6 months
47 F Colon cancer high grade adenocarcinoma Hodgkin’s disease classical type stage IV CT scan ABVD yes dead 9 months
83 M Rectal moderately differentiated cancer Metastatic Prostate cancer GS4+4 CT scan Goserelin / bicalutamide yes dead 8 months
69 M Sigmoid adenocarcinoma T2N1 stageIIB Lung adenocarcinoma Lung carcinoid tumour low grade CT scan Surgery for both then adjuvant chemotherapyfor lung carboplatin/ pemetrexed no Alive Under follow up
60 F Gastric adenocarcinoma T4N3M0 Lung mucinous adenocarcinoma CT scan Neoadjuvant chemotherapyECF for gastric cancer, Gastrectomy then Lung lobectomy N0 Dead 13 months
78 M Prostate adenocarcinoma Pleomorphic undifferentiated Sarcoma left femur CT scan Orchiectomy radiotherapy no Alive Lost follow up
59 M Renal cell carcinoma Metastatic nasopharyngeal cancer CT scan Target therapy plus chemotherapy yes Alive localized RCC refused surgery received pazopanib changed to sunitinib metastatic NPC received gemcitabine10 cycles then start 2nd linedocetaxel
68 F Stage I gastric leiomyosarcoma Stage I ovarian serous cancer CT scan Partial gastrectomy, ovarian cystectomy then Neoadjuvant carboplatin/paclitaxel then debulking surgery no free Underfollow up
34 F stage IA high grade ovarian mucinous cancer Stage IA endometrioid adenocarcinoma Path exam TAH&BSO and omentectomy. Chemotherapy carboplatin/paclitaxel no free Under follow up
45 F Stage IC mucinous ovarian cancer Stage IB endometrioid adenocarcinoma Path exam TAH&BSO and omentectomy. Chemotherapy carboplatin/paclitaxel Followed by radiotherapy no free Under follow up
Table 1: Patients with Synchronous Advanced Multiple Primary Tumours.

For metachronous tumours, Table 2, the median age of diagnosis for the second primary neoplasm was 54years (range: 34 to 82years) 3 patients of which were male. The median interval of six years was observed, the most common sites of a primary tumour were breast, the most common second malignancy was colorectal cancer and Metastasis at diagnosis were present in 7 patients (25%). Curative treatment could be offered in 15 patients (53%).

Age Sex Primary Treatment Secondary Treatment Metastasis at presentation Interval between primary and secondary Recurrence
53 F Stage I Breast IDC Surgery hormonal letrozole Stage II Colon cancer Surgery, FOLFOX No 7 y  
50 F Stage III Breast IDC Neoadjuvant chemotherapy EC/T Surgery, radiotherapy Coloncancer T4N1M0 SUREGERYCapecitabine / Oxaliplatin NO 14 Y Colon cancer recurrence and received chemotherapy HIPEC and on chemotherapy
64 F Stage II triple negative breast IDC Surgery chemotherapy radiotherapy Stage IV pancreatic cancer Palliative care yes 6 y Died after 3 months
39 F Breast IDC stage II Surgery FAC Tamoxifen Endometrium Surgery radiotherapy no 11 y  
44 F Stage II breast IDC Surgery TEC radiotherapy Tam /letrozole Stage III Uterine carcinosarcoma surgery carbo/paclitaxel   6 y  
42 F STAGE IIA BREAST IDC RT MRM TECradiotherapy Tamoxifen APL M5 ATRA no 2 y  
35 F Stage II breast IDC Surgery FEC/ Docetaxel Radiotherapy tamoxifen AML FLAG then IDC. no 5 y In CRUnder FU
51 F Stage IIIA Breast cancer IDC Her2neu positive disease Surgery chemotherapy Radiotherapy Lung squamous cell lung cancer Chemotherapy no 2 y Still under chemotherapy
47 F ER+ breast cancer Surgery and adjuvant chemo. Hormonal and radiotherapy Stage IIA triple negative breast cancer Surgeryand chemotherapy Yes 8 y Under follow up
45 F Papillary thyroid cancer Surgery total thyroidectomy, radioactive iodine Stage III Follicular lymphoma FCR   3 y Under follow up
41 F Papillary Thyroid Cancer Surgery radiotherapy Stage IC Ovarian serous cancer Debulking surgery Adjuvant chemotherapy no 9 y dead
72 M Papillary Thyroid cancer Thyroid surgery and ablation on replacement Stage IV NSCLC Chemotherapy and palliative radiotherapy yes 20 y dead
59 F CML chronic phase TKI Imatinib, desatinib Colon cancer Chemotherapy. Radiotherapy   9 y Dead
Age Sex Primary Treatment Secondary Treatment Metastasis at presentation Interval between primary and secondary Recurrence
35 F CML TKI Tracheal adenocarcinoma Surgery radiotherapy no 15 y In MMRUnder follow up
70 F Colon cancer Surgery, XELOX Breast Docetaxel trastuzumab yes 5 y dead
68* F Stage II adenocarcinoma Colon cancer Surgery radiotherapy chemotherapy CMLThen developed thyroid cancer TKIChemotherapy for colon No 2 y dead
80 F HCC HAchemoembolization Breast cancer stage IV liver bone Trastuzumab Hormonal treatment yes 2y dead
70 F Stage IV adenocarcinoma of the gall bladder Surgery then gemcitabine Stage colon cancer Surgery chemotherapy FOLFOX /bevacizumab yes 1y dead
66 F Stage endometrial endometrioid adenocarcinoma Surgery Breast DCIS Surgery Tamoxifen No 3 y free
41 F Stage II granulosa cell tumour of the ovary Surgery chemotherapy VAC Stage IV Carcinoid tumour of the pancreas octreotide yes 10 y Under octreotide
82 F Stage IA endometrial endometrioid Adenocarcinoma Surgery Stage I breast IDC Hormonal and radiotherapy no 1 y free
65 F Stage IIIc serous ovarian cancer Neoadjuvant chemotherapy carboplatin / paclitaxel Interval debuing Adjuvant chemotherapy Stage IV high grade neuroendocrine tumour Refused chemotherapy No 1y dead
59 M Cancer larynx T1N0M0 Radical Radiotherapy Stage IV gastric cancer Palliative chemotherapy and radiotherapy Yes, liver Mets 2 y dead
64 M DLBCL stage IV B Chemotherapy Stage IIIB Mesothelioma Chemotherapy No 4 y Under Chemotherapy
34* F Stage III B Hodgkin’s lymphoma ABVD Papillary thyroid cancer And left breast cancer Surgery radioactive iodine No 12 y Under follow up
55* F Stage IIA DLBCL Chemotherapy and radiotherapy Breast cancer stage and follicular lymphoma stage IA Lumpectomy and ALNDChemotherapy Hormonal therapy for the breast Radiotherapy for FL No 2y Under follow up
54 F Stage IIIA NHL follicular GII Rituximab for 4 weeks and then maintenance Hodgkin’s lymphoma in axillary lymph node AVD No 2 y Under follow up
Table 2: Patients with Metachronous Advanced Multiple Primary Tumours.

*Triple malignancies; IDC, Invasive ductal carcinoma; DLBCL, diffuse large b cell lymphoma; TAH BSO, total abdominal hysterectomy and bilateral salpingoophrectomy; BCS ALND, breast conserving surgery and axillary lymph node dissection; MRM, modified radical mastectomy NSCLC non-small cell lung cancer; ABVD, Adriamycin, bleomycin vinblastine dacarbazine; AML, Acute myeloid leukaemia; APL, Acute promyelocytic leukaemia.


Multiple primaries [14] are more than one tumour arising in different sites and or of different histology either synchronous or metachronous depends on the duration between them, 2-month according to SEER data [15] and 6 months according to IARC. In our study, we used the definition of IARC. The burden of multiple tumours is expected to increase due to the use of accurate imaging techniques. In a single facility in Saudi Arabia, we collected 54 cases over 7 years. Multiple-Primary did not always signify a bad prognosis as we treated all non-metastatic cases with curative intent.

It is most imperative to diagnose it early before the patient reaches the metastatic stage. This means that we should have a high degree of suspicion. The role of the radiologist is crucial as usually, radiologists are first to flag for suspicion of multiple tumours. In our study, most of the synchronous tumours were detected initially by CT scan then confirmed pathologically. Examples from our study as CT scan done for a patient with ovarian cancer showed a breast mass or CT scan showed a speculated lung lesion in a patient with breast cancer or showed renal mass in a patient with nasopharyngeal cancer.

The response to therapy is always an alarm for the physician to review his pathology by repeating the biopsy of the metastatic disease. In our study a patient with breast cancer who developed lung nodules treated treated with chemotherapy as. Metastatic breast then the poor response to chemotherapy urged us to biopsy the largest metastatic nodule and to our surprise came to be second primary Lung Cancer.

Cancer patients who survive their primary tumour always have a high risk to develop a second primary and this is due to many reasons like genetic predisposition as one of our patients who has Double Synchronous Primary Breast Cancer and Endometrial Cancer gave a strong family history of ovarian cancer and her BRCA genetic testing came to be positive.

Cancer treatment is carcinogenic. We are reporting leukaemia in ovarian cancer patients treated with chemotherapy, breast cancer patients treated for DLBCL, and breast and thyroid cancer in Hodgkin’s lymphoma patients treated at a young age.

For patients with breast cancer, the incidence of second primaries studied and has been reported to range from 4.1% to 16.4% [15-16]. An excess risk of endometrial cancer is reported with the use of Tamoxifen [17] Genetic factors as BRCA1 BRCA2 mutations are well-known risk factors for Multiple-Primary [18]. In this study, we reported 7 cases of the Synchronous Second-Primary with breast cancer, 3 cases with ovarian cancer. Also, we reported endometrial cancer in patients with hormone receptor-positive breast cancer with BRCA mutation. AML can be triggered during the first 2 years after radiation therapy and it is also a late effect of chemotherapy. For metachronous tumour in patients with breast cancer, We reported two cases of AML which may be chemotherapy related.

Patients with prostate cancer who received external beam radiotherapy are at increased risk of bladder cancer, rectal cancer and sarcomas within the radiation field after being disease-free for at least 5 years [19]. Second primaries can also occur in patients with prostate cancer owing to genetic factors, especially BRCA mutation [20]. In our study, we reported prostate cancer, rectal cancer, and prostate cancer and sarcoma synchronously.

The most important cause of mortality in Hodgkin’s lymphoma is a Second-Primary cancer [21]. We reported a case of colon cancer synchronously with Hodgkin’s lymphoma and thyroid cancer. Also, breast cancer that occurred 12 years after ABVD for Hodgkin’s lymphoma. Smoking is an important risk factor not only for lung cancer but also for a Second-Primary Cancer. A 7.9%of lung cancer cases who acquire a second primary have SCLC [22]. In this study, we reported colon cancer 1 year after lung cancer and gastroesophageal cancer that was diagnosed 18 months after the lung cancer diagnosis.

The treatment decision of synchronous tumours is not straightforward and usually requires a multidisciplinary approach, one of our patients had a synchronous breast and endometrial cancer. We discussed the case in our tumour board, and we decided to give her neoadjuvant chemotherapy followed by surgery MRM and TAH&BSO in the operating room by two surgeons.

We treated our patients with curative intent in more than 60% of cases so, we should always be aware of the possibility of a second primary cancer. Late metastatic spread in a patient with triple-negative breast cancer led us to suspect second primary and diagnose pancreatic cancer. Also, low tumour marker in ovarian cancer patient which was initially high was found to have a second primary neuroendocrine tumour, continued smoking history should alert us about this possible important carcinogen.

We should inform our patients about the late side effects of their treatment, particularly Second-Primary Malignancies, by including it in the consent form. Such actions would educate patients on the value of continuous surveillance and avoiding all possible carcinogens especially smoking in addition to encouraging them for a healthy lifestyle [23-24].

Patients with multiple primaries are usually excluded from clinical trials and there are no established guidelines to treat these cases. we need clinical trials to study the new histology non-specific medications like (immunotherapy, biologic therapy. etc).

Finally, in our medical facility, we adopted the policy of referring our cases with Multiple-Primary to our genetic oncology clinic for evaluation and genetic testing; this hopefully will help us gain more knowledge about patients with hereditary cancer. we will report these data separately.

In conclusion, we are expecting an increase in the prevalence of Multiple-Primary tumours due to increased accuracy of diagnostic techniques in addition to novel target therapy that may increase the risk. Hereditary cancer syndrome, smoking, cancer therapy are all risk factors. we need to pick these cases as early as possible before the development of metastasis as this has a marked impact on patient survival. Treatment decisions for these cases should be based on a multidisciplinary approach.

Research on this topic is an unmet need particularly the genetic background for developing second primary cancers. To reflect more of a real-life population, we need clinical trials investigating those patients in detail to increase the physician’s awareness that these cases are not rare, and they need to be treated with curative intent in most situations.



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