Pyrotinib Maleate Tablets in Combination With Dalpiciclib Isethionate Tablets and Standard Endocrine Therapy

"Pyrotinib Maleate Tablets: 320 mg/day administered continuously from the first day of the first course of treatment, orally within 30 minutes after breakfast, missed doses without refill, every 21 days as a cycle.~Dalpiciclib Isethionate Tablets: 125 mg orally every 28 days as a treatment cycle, with continuous medication for the first 3 weeks (Day 1 to Day 21), and rest (no medication) for the next 1 week (Day 22 to Day 28).~Endocrine therapy: The endocrine therapy drug is selected by the investigator."