Why does cancer treatment that targets growth factor receptors sometimes fail to induce apoptosis in tumor cells despite initial inhibition of cell division?

💡 Explanation

Cancer cells can develop checkpoint adaptations that allow them to bypass the need for external growth signals to progress through the cell division cycle; because the division checkpoints override external growth signals, therefore apoptosis does not occur, rather than receptor internalization which just reduces signaling.

• If a patient's inflammatory response is sustained due to persistent pathogen presence, which consequence concerning cytokine feedback becomes most likely?
• If a patient abruptly stops taking a stimulant medication after chronic use, which effect is most directly linked to increased craving?
• If a mutation reduces the functionality of the retinal pigment epithelium (RPE) in the eye, which consequence involving nutrient transport to photoreceptors is most likely?
• Why does immune cell exhaustion occur in chronic infections and cancer?
• If a descending inhibitory pathway from the brainstem is damaged, which consequence follows regarding nociceptor activity in response to a peripheral stimulus?
• During a sudden drop in blood pressure, which mechanism explains why baroreceptors trigger increased sympathetic nervous system activity in cardiovascular regulation?