Phase II study of oral vitamin B12 supplementation as an alternative to intramuscular injection for patients with non-small cell lung cancer undergoing pemetrexed therapy

Autor: Yoshiro Nakahara, Kageaki Watanabe, Yusuke Takagi, Yusuke Okuma, Satoshi Takahashi, Tatsuru Okamura, Makiko Yomota, Yukio Hosomi, Makoto Nagamata, Kuniko Sunami, Tsuneo Shimokawa
Rok vydání: 2016
Předmět:
Zdroj: Cancer Chemotherapy and Pharmacology. 77:559-564
ISSN: 1432-0843
0344-5704
DOI: 10.1007/s00280-015-2954-x
Popis: A vitamin B12 supplement is required in pemetrexed single agent therapy. Intramuscular administration is the method of choice; however, oral administration is simpler and easier and may be sufficiently effective. We conducted a Phase II study to evaluate the safety of oral administration of vitamin B12 in patients with advanced non-small cell lung cancer who received pemetrexed single agent therapy. Folic acid and vitamin B12 were given orally for ˃1 week before pemetrexed administration. The primary end-point was onset of a grade ≥3 neutropenia ratio (50 % of threshold expression ratios; an expectation expression ratio of 21 %; α, 0.05; β, 0.1). Blood concentration of folic acid and homocysteine which are markers of vitamin B12 deficiency were also examined (UMIN000003180). A total of 25 cases were registered from February 2010 to July 2014. The ratio of grade ≥3 neutropenia was 36 % (95 % CI 22–52 %). Grade ≥3 non-hematologic toxicity and hematologic toxicity were seen in 20 % (5 cases) and 44 % (11 cases) of patients, respectively. In addition, the homocysteine blood concentration just before the first cycle dosage of pemetrexed was significantly elevated relative to the 2–3 cycle. This study failed to meet its primary endpoint. We could not demonstrate the safety and efficacy of the 1-week vitamin B12 oral administration protocol as compared with intramuscular administration.
Databáze: OpenAIRE
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