  Studies based on the gamma-ray lines from radioactive decay of unstable
isotopes produced in massive-star and supernova nucleosynthesis have been among
INTEGRAL's prominent science achievements. 26Al has become a tool to study
specific source regions, such as massive-star groups and associations in nearby
regions which can be discriminated from the galactic-plane background, and the
inner Galaxy where Doppler shifted lines add to the astronomical information.
60Fe is co-produced by the sources of 26Al, and the isotopic ratio from their
nucleosynthesis encodes stellar-structure information. Here we summarize latest
results using the accumulated multi-year database of observations, point to the
relevant publications, and discuss their astrophysical implications.
