Are there changes in characteristics and therapy of young patients with early-onset breast cancer in Germany over the last decade?

The objective of the study is to investigate recent changes in patient characteristics and treatment procedures of young breast cancer patients over the last 10 years in Germany. The study describes the data of 518 patients who were treated adjuvantly between 2008 and 2011 and participated in a resident mother-child program for rehabilitation (cohort II). The data includes TNM-categories, biology of tumor and therapies. This population is compared to a cohort of 535 patients, who were treated between 2002 and 2006 (cohort I). Characteristics and treatment of cohort II are compared with a normally age distributed cohort. 51.5 % of the patients in cohort II were diagnosed with tumor category pT1, 36.9 % pT2, 4.4 % pT3 and 1.2 % pT4. 3.3 % had merely DCIS. 58.1 % of the patients were pN0, 28.4 % pN1 and 13.5 % had a more intense manifestation of lymph nodes. 45.8 % of the tumors showed a grading classified as G3, 69.3 % were estrogen and progesterone hormone receptor positive and 21.8 % Her2 positive. 24.5 % of the examined patients showed a triple negative carcinoma. 66.2 % of the patients with pT1 or pT2 underwent breast-conserving surgery. Overall 19.2 % of the women received mastectomy only and 17.4 % received mastectomy with subsequent reconstruction. 98.6 % of the patients received axillary surgery, 87.6 % chemotherapy. Overall, 21.0 % of the patients received their chemotherapy in connection with clinical studies. 88.0 % of the patients with hormone receptor positive tumors received endocrine therapy, 25.5 % of them with GnRH-analogs. In comparison with cohort I the tumors in cohort II were detected with a higher proportion of negative lymph nodes (48.8 %/58.1 %, p = 0.008) and G1 grading (4.9/5.6 %, p = 0.001). On the other hand the percentage of triple negative tumors increased from 21.0 % to 24.5 % (p = 0.018). Operative therapy has adjusted to a more moderate way. Breast-conserving therapy with pT1 and pT2 increases from 57.3 % to 66.2 % (p = 0.006), sentinel lymph node biopsy only from 24.5 % to 47.5 % (paEuro(1)0.001) over the years. The percentages of chemotherapy, radiation, endocrine therapy and antibody therapy with positive receptor have stayed stable over the last decade. Comparing cohort II with a normally age distributed group (DMP II 2007-2009) the young patients have still a much lower portion of negative lymph nodes (58.1 %/67.9 %) and positive hormone receptor status (69.3 %/85.1 %). The percentage of a high grading G3 is 45.8 % in cohort II versus 24.7 % in DMP II. The portion of breast-conserving therapy with pT1 is with 68.9 versus 82.2 % still comparatively low. Young patients received more axillary surgery (98.6 %/81.5 %) but less endocrine therapy with hormone receptor positive tumors (93.3 %/94.7 %). Young breast cancer patients in Germany can still be regarded as a special group. Although tumors are now more often detected before reaching the lymph nodes than 10 years ago, an even bigger percentage is triple negative. Operative treatment has improved to a less aggressive way. Still operative and medical treatments have to be chosen after very careful evaluation.