LIQ - lower inner quadrant; LOQ - lower outer quadrant; UIQ - ​​​​​​​upper inner quadrant; UOQ - ​​​​​​​upper outer quadrant; DCIS - ​​​​​​​ductal carcinoma in situ; IDC - ​​​​​​​invasive ductal carcinoma; ILC - ​​​​​​​invasive lobular carcinoma; N/A - ​​​​​​​not available; LVI - ​​​​​​​lymphovascular invasion; ER - ​​​​​​​estrogen receptor; PR - ​​​​​​​progesterone receptor; HER2 - ​​​​​​​human epidermal growth factor 2 receptor. The gene discussed is ESR1; the disease is ductal breast carcinoma in situ.