Medline ® Abstracts for References 57,58
of 'Anaplastic lymphoma kinase (ALK) fusion oncogene positive non-small cell lung cancer'
Heart rate decrease during crizotinib treatment and potential correlation to clinical response.
Ou SH, Tong WP, Azada M, Siwak-Tapp C, Dy J, Stiber JA
Cancer. 2013 Jun;119(11):1969-75. Epub 2013 Mar 15.
BACKGROUND: Crizotinib is used for the treatment of advanced anaplastic lymphoma kinase (ALK)-rearranged nonsmall cell lung cancer (NSCLC). Sinus bradycardia (SB) is a side effect listed in its package insert. We investigated the frequency and timing of SB, patient characteristics associated with SB during crizotinib treatment, and potential correlation between heart rate (HR) changes and clinical response to crizotinib.
METHODS: A retrospective chart review was conducted of the timing and frequency of SB, patient characteristics, and clinical response of patients to crizotinib treatment.
RESULTS: Forty-twp patients who had ALK-rearranged or mesenchymal epithelial transition (MET)-amplified NSCLC and received treatment with oral crizotinib 250 mg twice daily who were enrolled in 2 crizotinib trials (PROFILE 1001 and PROFILE 1005) were analyzed. There was an average decrease of 26.1 beats per minute (bpm) from the pretreatment HR among all patients during crizotinib treatment. Twenty-nine patients (69%) experienced at least 1 episode of SB (HR,<60 bpm). The average timeto the lowest HR recorded was 18.6 weeks (range, 5-72 weeks). Patients who experienced SB were significantly older (aged 55.8 years vs 47.8 years; P = .0336), had a lower pretreatment HR (mean, 77.9 bpm vs 100.6 bpm; P = .002), and were on crizotinib longer (52.9 weeks vs 24.6 weeks; P = .0050) than patients who did not experience SB. The overall response rate (P = .0195) and the maximum tumor shrinkage (P = .0205) were significantly greater in patients who experienced SB.
CONCLUSIONS: HR decrease is common during crizotinib treatment. It remains to be determined whether the correlation between HR decrease and clinical response to crizotinib reflects a biomarker of drug efficacy or a time/cumulative dose-dependent phenomenon.
Chao Family Comprehensive Cancer Center, University of California Irvine Medical Center, Orange, CA, USA. email@example.com
Hypogonadism related to crizotinib therapy: implications for patient care.
Ramalingam SS, Shaw AT
Cancer. 2012;118(21):E1. Epub 2012 Apr 4.