Poster Display session 2 Poster Display session

285P - Second primary malignancies in patients with breast cancer (ID 568)

Presentation Number
Lecture Time
12:00 - 12:00
  • Carlos Erasun Lecuona (Barcelona, Barcelona, Spain)
Session Name
Poster Display session 2
Poster Area (Hall 4), Fira Gran Via, Barcelona, Spain
12:00 - 13:00



The risk of developing second primary malignancies (SPM) in patients (p) with breast cancer (BC) is higher than among the general population. Tamoxifen, chemotherapy and breast irradiation are associated with an increased risk of SPM. The aim of this study was to investigate the clinicopathological characteristics of the non BC SPM in p with primary diagnostic of BC.


We conducted a retrospective study in a cohort of 2,111 women with BC diagnosed between 1975 and 2014 in a regional cancer institute in Spain. We evaluated the incidence and pattern of SPM per Warren and Gates criteria, and the impact of breast cancer treatment on SPM.


57p (2.7%) of the cohort developed a SPM, 13 of them (23%) had synchronous tumors and 44p (77%) had metachronous tumors. 10p (18%) developed a third primary malignancy and 1p (1.7%) developed a fourth primary malignancy. The most frequent SPM were hematological malignancies (HM) (11p, 19%), followed by endometrial (7p, 12.3%), gastric (7p, 12.3%), lung (6p, 10.5%), parotid tumors (6p, 10.5%) and melanoma (6p, 10.5%). The mean latency period for SPM was 62.7 months. HM were developed in 0.52% of the cohort of 2,111p. Myeloid neoplasms were diagnosed in 6p (0.28%). Among them, 1p developed chronic myeloid leukemia and 5p developed myelodysplastic syndromes (MDS), including refractory anemia with excess blasts-2 (2p) and 5q minus syndrome (2p). Lymphoid neoplasms were diagnosed in 5p (0.24%). The incidence of HM was similar in both anthracycline-treated and not treated p (0.48% and 0.58%, respectively). The incidence of HM in p treated with radiotherapy was higher than in p who did not receive radiotherapy (0.65% vs 0.19%).


HM are the most frequent non BC SPM in p treated from BC; frequently they are therapy related neoplasms. Deescalating chemotherapy and radiotherapy in BC and finding genetic markers of early malignancy detection are mandatory.

Legal entity responsible for the study

The authors.


Has not received any funding.


All authors have declared no conflicts of interest.