26 October 2025
: Case report 
Oral Tamoxifen and Abemaciclib in Postoperative Therapy for Male Breast Cancer: A Case Report
Unusual setting of medical care, Rare disease
Kei Ishii
ABCDEFG 1,2*, Masae Torii D 2, Hiroshi Yoshibayashi C 3, Yoshiaki Matsumoto B 2, Yasuo Matsutani D 2
DOI: 10.12659/AJCR.949005
Am J Case Rep 2025; 26:e949005
Table 2 Changes in creatinine, estimated globuar filtration rate (eGFR), and cystatin C levels in laboratory blood test results. During administration of abemaciclib, cystatin C did not exceed the reference range.
| Weeks after starting abemaciclib | Creatinine (mg/dL) | eGFR (mL/min/1.73 m2) | Cystatin C (mg/L) |
|---|---|---|---|
| 0 | 0.88 | 76 | |
| 4 | 1.29 | 50 | |
| 6 | 0.98 | 67 | |
| 8 | 0.94 | 71 | |
| 10 | 1.30 | 50 | |
| 12 | 1.01 | 65 | 0.92 |
| 16 | 1.40 | 45 | |
| 21 | 1.33 | 48 | 0.79 |
| 23 | 1.36 | 47 | |
| Reference range | 0.65–1.07 | 60 | 0.61–0.95 |