Tibremciclib shows promise as an additional CDK4/6 inhibitor; however, its global integration requires broader, more diverse clinical trials, robust safety and survival data, and strategies to mitigate toxicity risks. Bridging access gaps will require coordinated efforts across policy, infrastructure, and global partnerships to ensure equitable benefit from emerging therapies.
Furthermore, tibremciclib plus fulvestrant demonstrated a manageable safety profile in patients with HR+/ERBB2- ABC who experienced progression while receiving prior ET. ClinicalTrials.gov Identifier: NCT05433480.
Tibremciclib monotherapy or combined with fulvestrant was well tolerated with the RP2D set at 400 mg plus fulvestrant 500 mg. PK was consistent with dose proportionality. Both regimens showed preliminary antitumor activity in patients with HR-positive/HER2-negative ABC, supporting further evaluation in a phase III study (NCT05433480).