MAGEC1 (MAGE family member C1) is an X-linked cancer-testis antigen localized to the cytoplasm and nucleus with roles in protein binding and transcriptional regulation 1. The gene is preferentially expressed in spermatogonial stem cells during normal spermatogenesis 2, where it plays a candidate role in male fertility; variants in MAGEC1 were recurrently detected in patients with male factor infertility 2. MAGEC1 functions as a cancer-testis antigen, normally silent in differentiated tissues but re-expressed in various malignancies. In seminomatous testicular germ cell tumors, MAGEC1 was expressed in 40% of classic seminomas 3. In multiple myeloma, MAGEC1/CT7 was the only independent prognostic factor in non-transplanted patients and was expressed in 77% of advanced-stage cases, making it a candidate for immunotherapy 4. MAGEC1 expression associated with favorable prognosis in colon cancer 5 but showed suggestive genome-wide association with high-grade serous ovarian carcinoma risk in African ancestry women 6. A MAGEC1 start codon variant (p.Met1?) showed association with hereditary prostate cancer (OR=3.38) 1, though a distinct MAGEC1 variant (rs176036) did not confer ovarian cancer risk in a Jammu and Kashmir population 7. These findings indicate MAGEC1 participates in spermatogenesis and serves as an immunogenic target in malignancies with prognostic implications.