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Table 2 Tumor characteristics for breast cancer patients in COSTLES group and control group

From: Is letrozole during ovarian stimulation useful in breast cancer patients undergoing fertility preservation to reduce early luteal progesterone levels following GnRH-agonist trigger?

Tumor characteristics

COSTLES group n = 84

Control group n = 77

ER and/or PR positive

63 (75.0%)

59 (76.6%)

T1/T2*

82 (97.6%)

75 (97.4%)

BRCA positive

7 (8.3%)

5 (6.5%)

  1. Abbreviations: ER estrogen receptor, PR progesterone receptor
  2. *according to TNM classification